JP6430861B2 - Motor, motor device including the motor, and washing machine including the motor device - Google Patents

Description

  The present invention relates to a motor, a motor device including the motor, and a washing machine including the motor device.

  Conventionally, there has been proposed a motor configured to increase output torque while achieving low noise and low vibration. For example, the motor described in Patent Document 1 includes an outer rotor provided outside the stator and an inner rotor provided inside the stator. The outer rotor and the inner rotor are connected to the same rotating shaft and configured to rotate integrally. With such a configuration, the driving force of the outer rotor and the driving force of the inner rotor are added to increase the output torque.

International Publication No. 2007/123107

  On the other hand, in recent years, there has been a demand for a motor that realizes NT characteristics of both low-speed high-torque and high-speed low-torque as motor NT characteristics representing the relationship between rotational speed and torque. For example, a motor for driving a vehicle such as an electric vehicle or a hybrid vehicle is required to have a low speed and high torque characteristic when the vehicle starts, and to have a high speed and low torque characteristic when the vehicle speed increases. Further, for example, a direct drive motor of a washing machine requires low speed and high torque characteristics in a washing process or a rinsing process, and high speed and low torque characteristics in a dehydration process.

  However, in the motor described in Patent Document 1, a configuration for realizing the NT characteristics of both low speed and high torque and high speed and low torque has not been sufficiently studied.

  An object of this invention is to provide the motor which implement | achieves NT characteristic of both low-speed high torque and high-speed low torque, a motor apparatus provided with this motor, and a washing machine provided with this motor apparatus.

  The motor according to one aspect of the present invention generates a first rotating magnetic field when one of the three-phase AC voltage and the six-phase AC voltage is selectively output, and the three-phase AC voltage and A stator that generates a second rotating magnetic field when the other second AC voltage of the six-phase AC voltage is selectively output, and a rotor that rotates around a predetermined rotation axis in the stator, The rotor is disposed on the inner side of the circumferential surface of the core portion, the rotor core including a cylindrical core portion, and a plurality of salient poles formed to protrude from the circumferential surface of the core portion toward the stator. A plurality of magnets, wherein the plurality of salient poles are formed around the rotation axis, the plurality of magnets are arranged around the rotation axis, and the first rotating magnetic field is generated by the plurality of magnets. Magnetically coupled to the generated basic magnetic field, The second rotating magnetic field is rotated by torque, and the second rotating magnetic field is magnetically coupled with a modulated magnetic field in which the basic magnetic field is modulated by the plurality of salient poles, and rotates the rotor with a second torque different from the first torque. It is.

  In this aspect, when one of the three-phase AC voltage and the six-phase AC voltage is selectively output, a first rotating magnetic field is generated in the stator. The first rotating magnetic field is magnetically coupled to a basic magnetic field generated by a plurality of magnets, and rotates the rotor with a first torque. When the other second AC voltage of the other of the three-phase AC voltage and the six-phase AC voltage is selectively output, a second rotating magnetic field is generated in the stator. The second rotating magnetic field is magnetically coupled with a modulated magnetic field in which the basic magnetic field is modulated by a plurality of salient poles, and rotates the rotor with a second torque different from the first torque. Therefore, according to this aspect, the motor can be rotated by two types of torques, ie, the first torque and the second torque. As a result, it is possible to realize NT characteristics of both low speed and high torque and high speed and low torque.

  In the above aspect, the first rotating magnetic field is rotated by the first torque by rotating the rotor at a first torque constant, and the second rotating magnetic field is rotated by rotating the rotor at a second torque constant. You may rotate with the said 2nd torque.

  In this aspect, the first rotating magnetic field rotates with the first torque by rotating the rotor with the first torque constant. The second rotating magnetic field rotates with the second torque by rotating the rotor with the second torque constant. Therefore, according to this aspect, the motor can be rotated by two types of torques, ie, the first torque and the second torque.

  In the above aspect, the stator includes a coil portion to which the three-phase AC voltage and the six-phase AC voltage are selectively applied, and the number of slots Ns (Ns) that is formed around the rotation axis and accommodates the coil portion. May be a multiple of 6). The plurality of salient poles may define a pole number Np (Np is an integer of 2 or more). The plurality of magnets may define a pole pair number Nm (Nm is a positive integer). The number of pole pairs Nm may be set to a value that causes the first rotating magnetic field to rotate the rotor under the number of slots Ns. The number of pole pairs (Np−Nm) may be set to a value that causes the second rotating magnetic field to rotate the rotor under the slot number Ns.

  In this aspect, the number of pole pairs Nm of the plurality of magnets is set to a value that causes the first rotating magnetic field to rotate the rotor under the number of slots Ns. The number of pole pairs Nm of the plurality of magnets and the number of poles Np of the plurality of salient poles are set to values at which the second rotating magnetic field rotates the rotor under the number of slots Ns. For this reason, according to this aspect, the motor can be rotated by two kinds of torques of the first torque and the second torque, respectively.

  In the above aspect, the first AC voltage is the six-phase AC voltage, the second AC voltage is the three-phase AC voltage, Nm = Ns / 6 or 5Ns / 6, and Np−Nm = It may be Ns / 3 or 2Ns / 3.

  In this aspect, the first AC voltage is a six-phase AC voltage. For this reason, the first rotating magnetic field is generated when a six-phase AC voltage is applied to the coil portion. Nm = Ns / 6 or 5Ns / 6. Therefore, under the slot number Ns, the basic magnetic field generated by the plurality of magnets is magnetically coupled to the first rotating magnetic field generated by the six-phase AC voltage. The second AC voltage is a three-phase AC voltage. For this reason, the second rotating magnetic field is generated when a three-phase AC voltage is applied to the coil section. Np−Nm = Ns / 3 or 2Ns / 3. Therefore, under the number of slots Ns, the modulated magnetic field in which the basic magnetic field is modulated by a plurality of salient poles is magnetically coupled to the second rotating magnetic field generated by the three-phase AC voltage. As a result, the first rotating magnetic field and the second rotating magnetic field can respectively rotate the rotor.

  In the above aspect, the first AC voltage is the three-phase AC voltage, the second AC voltage is the six-phase AC voltage, Nm = Ns / 3 or 2Ns / 3, and Np−Nm = Ns / 6 or 5Ns / 6 may be used.

  In this aspect, the first AC voltage is a three-phase AC voltage. For this reason, the first rotating magnetic field is generated when a three-phase AC voltage is applied to the coil section. Nm = Ns / 3 or 2Ns / 3. Therefore, under the slot number Ns, the basic magnetic field generated by the plurality of magnets is magnetically coupled to the first rotating magnetic field generated by the three-phase AC voltage. The second AC voltage is a six-phase AC voltage. For this reason, the second rotating magnetic field is generated when a six-phase AC voltage is applied to the coil section. Np−Nm = Ns / 6 or 5Ns / 6. Therefore, under the number of slots Ns, the modulated magnetic field in which the basic magnetic field is modulated by a plurality of salient poles is magnetically coupled to the second rotating magnetic field generated by the six-phase AC voltage. As a result, according to this aspect, the first rotating magnetic field and the second rotating magnetic field can each rotate the rotor.

  In the above aspect, the plurality of salient poles may include a first salient pole and a second salient pole adjacent to the first salient pole provided at equal intervals around the rotation axis. The first salient pole includes a first side surface defined by a surface extending radially from the rotation axis, and a second side surface defined by a surface extending radially from the rotation axis and opposite to the first side surface. You may have. The second salient pole may have a third side surface opposed to the second side surface, which is defined by a surface extending radially from the rotation axis. A central angle formed by the first side surface, the rotating shaft, and the second side surface may be equal to a central angle formed by the second side surface, the rotating shaft, and the third side surface.

  In this aspect, the central angle formed by the first side surface, the rotation shaft, and the second side surface is equal to the central angle formed by the second side surface, the rotation shaft, and the third side surface. For this reason, according to this aspect, the magnetic flux distribution passing through the salient poles is equally spaced around the rotation axis. Therefore, the modulation magnetic field can be point symmetric. As a result, the rotor can be smoothly rotated by the second rotating magnetic field.

  A motor device according to another aspect of the present invention includes the motor according to any one of the above aspects, and a drive unit that selectively outputs the three-phase AC voltage and the six-phase AC voltage, and the stators are mutually connected. The connected first phase coil unit, second phase coil unit, third phase coil unit, fourth phase coil unit, fifth phase coil unit, and sixth phase coil unit, wherein the drive The unit outputs three-phase AC voltages Vu, Vv, Vw whose phases are sequentially shifted by 120 degrees as the three-phase AC voltages, and the phases are sequentially shifted by 60 degrees as the six-phase AC voltages. Six-phase AC voltages Va, Vb, Vc, Vd, Ve, and Vf are output, and the three-phase AC voltage Vu and the six-phase AC voltage Va are selectively applied to the first phase coil unit, The second phase coil section includes the three-phase AC voltage Vv and the six-phase AC voltage Vb. The three-phase AC voltage Vw and the six-phase AC voltage Vc are selectively applied to the third-phase coil unit, and the three-phase AC voltage is applied to the fourth-phase coil unit. Vu and the six-phase AC voltage Vd are selectively applied, and the third-phase AC voltage Vv and the six-phase AC voltage Ve are selectively applied to the fifth-phase coil unit. The three-phase AC voltage Vw and the six-phase AC voltage Vf are selectively applied to the coil section.

  In this embodiment, the first phase coil portion to the sixth phase coil portion have three-phase AC voltages Vu, Vv, Vw, Vu, Vv, Vw and six-phase AC voltages Va, Vb, Vc, Vd, Ve, Vf and Are selectively applied. Therefore, according to this aspect, when the 6-phase AC voltage and the 3-phase AC voltage are selectively output, the first rotating magnetic field and the second rotating magnetic field can be selectively generated in the stator.

  In the other aspect, the driving unit is connected to the first-phase coil unit to the sixth-phase coil unit, and is connected to the DC power source in parallel with each other. A six-phase inverter having an element, and an inverter control unit that selectively generates the three-phase AC voltage and the six-phase AC voltage by performing PWM control on the first-phase switching element to the sixth-phase switching element, May be included.

  In this aspect, the first to sixth phase switching elements of the six-phase inverter are PWM-controlled by the inverter control unit, and a three-phase AC voltage and a six-phase AC voltage are selectively generated. The first-phase switching element to the sixth-phase switching element of the six-phase inverter are connected to the first-phase coil section to the sixth-phase coil section, respectively, and connected to the DC power supply in parallel. Therefore, according to this aspect, it is possible to suitably apply the three-phase AC voltage and the six-phase AC voltage to the first-phase coil unit to the sixth-phase coil unit.

  A washing machine according to still another aspect of the present invention includes the motor device according to any of the other aspects described above, a rotating drum in which clothing is accommodated, a washing step for washing the clothing, and a rinsing step for rinsing the clothing, A dehydration step for dehydrating the garment, and a washing control unit for performing the dehydration process, wherein the motor device is disposed at a position coinciding with the rotation shaft and connected to the rotor to transmit the rotation of the rotor to the outside. The transmission shaft is connected to the rotating drum, and the driving unit selectively outputs the three-phase AC voltage and the six-phase AC voltage to perform the washing step and the rinsing. In the step, the rotor is rotated with a higher torque of the first torque and the second torque, and in the dehydrating step, the rotor is rotated with a lower torque of the first torque and the second torque. The Is shall.

  In this aspect, a three-phase AC voltage and a six-phase AC voltage are selectively output, and in the washing step and the rinsing step, the rotor is rotated by the higher torque of the first torque and the second torque, and the dehydration step Then, the rotor is rotated with the lower torque of the first torque and the second torque. Therefore, according to this aspect, while the transmission shaft is a direct drive system in which the transmission shaft is connected to the rotating drum, the rotating drum is rotated at an appropriate torque and rotating speed in the washing process, the rinsing process, and the dehydrating process, respectively. be able to.

  According to the present invention, it is possible to realize NT characteristics of both low speed and high torque and high speed and low torque.

It is a figure showing roughly the composition of the motor of a 1st embodiment. It is a figure which shows schematically the structure of the drive part which drives the motor shown by FIG. It is a figure which shows an example of a three-phase alternating current voltage roughly. It is a figure which shows an example of 6 phase alternating voltage roughly. It is a figure which shows roughly the result of having analyzed the induced voltage induced in a coil by the finite element method when the rotor of the motor shown in FIG. 1 is forcibly rotated. It is a figure which shows roughly the result of having analyzed the result shown by FIG. 5 by the fast Fourier transform. It is a figure which shows roughly the torque of a rotor when a 3-phase alternating voltage and a 6-phase alternating voltage are selectively applied to a coil. It is a block diagram which shows roughly the structure of the washing machine of 2nd Embodiment. It is a schematic perspective view of a washing machine. It is a schematic sectional drawing of a washing machine. It is a flowchart which shows roughly operation | movement of a washing machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are used for the same components.

(First embodiment)
(Constitution)
FIG. 1 is a diagram schematically showing the configuration of the motor of the first embodiment. FIG. 2 is a diagram schematically showing a configuration of a drive unit that drives the motor shown in FIG.

  As shown in FIG. 1, the motor 1 of the first embodiment includes a stator 10 and a rotor 20.

  The stator 10 is formed in a cylindrical shape with the rotation axis P0 of the motor 1 as the center. Stator 10 includes a coil portion and a plurality of slots 11. The plurality of slots 11 accommodate coil portions and are formed on the inner peripheral surface of the stator 10. In the first embodiment, the slot number Ns is 18, as shown in FIG.

  In the slot 11, coils A1 to F1, A2 to F2, and A3 to F3 wound in a concentrated winding manner are accommodated in the counterclockwise order in FIG. As shown in FIG. 2, coils A1 to A3, coils B1 to B3, coils C1 to C3, coils D1 to D3, coils E1 to E3, and coils F1 to F3 are connected in series. Hereinafter, the coils A1 to A3 are collectively referred to as a coil A, the coils B1 to B3 are collectively referred to as a coil B, the coils C1 to C3 are collectively referred to as a coil C, the coils D1 to D3 are collectively referred to as a coil D, and the coils E1 to E1 E3 is generically referred to as coil E, and coils F1 to F3 are generically referred to as coil F.

  As shown in FIG. 2, coil A (an example of a first phase coil part), coil B (an example of a second phase coil part), coil C (an example of a third phase coil part), coil D ( An example of the fourth phase coil part), a coil E (an example of the fifth phase coil part), and a coil F (an example of the sixth phase coil part) are connected to each other in a star shape to form a six-phase coil. doing. Note that the connection method of the coils A to F is not limited to a star shape, and may be another connection method.

  As shown in FIG. 1, the rotor 20 is disposed inside the stator 10 via a predetermined gap. The rotor 20 is supported by the stator 10 so as to be rotatable around the rotation axis P <b> 0 of the motor 1.

  The rotor 20 includes a rotor core 20 a and a plurality of permanent magnets 23. The rotor core 20 a is made of a magnetic material and includes a core portion 21 and a plurality of salient poles 22. The core portion 21 is formed in a columnar shape centered on the rotation axis P <b> 0 of the motor 1.

  The plurality of salient poles 22 are formed on the peripheral surface of the core portion 21 so as to protrude toward the stator 10. As shown in FIG. 1, the pole number Np of the salient poles 22 of the rotor 20 is 15. That is, in the first embodiment, the rotor 20 has 15 salient poles 22.

  The plurality of salient poles 22 are formed at equal intervals around the rotation axis P <b> 0 of the motor 1. The “equal interval” is not limited to an equal interval in the mathematical sense. A plurality of salient poles 22 should just be formed at equal intervals in appearance.

  The positional relationship of the plurality of salient poles 22 will be described using one salient pole 22a among the plurality of salient poles 22 and the salient pole 22b adjacent to the salient pole 22a.

  The salient pole 22 a has a side surface 24 and a side surface 25 opposite to the side surface 24. The side surface 24 is included in a surface 24a extending radially from the rotation axis P0 of the motor 1, and the side surface 25 is included in a surface 25a extending radially from the rotation axis P0 of the motor 1. The salient pole 22 b has a side surface 26 that faces the side surface 24. The side surface 26 is included in a surface 26 a that extends radially from the rotation axis P <b> 0 of the motor 1.

  A center angle θ1 formed by the surface 24a (side surface 24), the rotation axis P0, and the surface 25a (side surface 25), and a center formed by the surface 25a (side surface 25), the rotation axis P0, and the surface 26a (side surface 26). The angle θ2 is an equal value. In other words, the gap between the salient poles 22 and the salient poles 22 and the salient poles 22 match in shape and size. The “equal value” is not limited to an equal value in a mathematical sense. It is sufficient that the central angle θ1 and the central angle θ2 are equal in appearance.

  In FIG. 1, the core portion 21 and the plurality of salient poles 22 are integrally formed of a magnetic material. Alternatively, the core portion 21 made of a magnetic material and the plurality of salient poles 22 made of a magnetic material are formed separately, and the plurality of salient poles 22 are fixed to the core portion 21 with an adhesive or the like. It may be.

  The plurality of permanent magnets 23 are arranged at substantially equal intervals around the rotation axis P0 of the motor 1 at positions closer to the rotation axis P0 than the plurality of salient poles 22 of the rotor core 21. As shown in FIG. 1, the number of pole pairs Nm of the permanent magnet 23 is 3. That is, the number of poles of the permanent magnet 23 is six. In the structure shown in FIG. 1, the rotor 20 is an embedded permanent magnet in which a permanent magnet 23 is embedded in the rotor core 21. Alternatively, a surface-attached permanent magnet in which the permanent magnet 23 is attached to the surface of the rotor core 21 may be used. In short, it is only necessary that the permanent magnet 23 is disposed on the opposite side of the stator 10 with the plurality of salient poles 22 as a reference.

  As shown in FIG. 2, the drive unit 40 includes a DC power supply 41, a six-phase inverter 42, and a motor control unit 43. The DC power supply 41 includes a battery, for example, and outputs a predetermined DC voltage between the positive line Lp and the negative line Ln.

  The six-phase inverter 42 includes switching elements Qau and Qal (an example of a first phase switching element) and switching elements Qbu and Qbl (an example of the second phase switching element) connected between the positive line Lp and the negative line Ln, respectively. Example), switching elements Qcu, Qcl (an example of a third phase switching element), switching elements Qdu, Qdl (an example of a fourth phase switching element), and switching elements Qeu, Qel (an example of a fifth phase switching element) And switching elements Qfu and Qfl (an example of a sixth phase switching element). In this embodiment, for example, a metal oxide semiconductor field effect transistor (MOSFET) is used as each switching element. Each switching element is not limited to a MOSFET, and, for example, an insulated gate bipolar transistor (IGBT) may be used.

  A connection point K1 between the switching element Qau and the switching element Qal is connected to the coil A. A connection point K2 between the switching element Qbu and the switching element Qbl is connected to the coil B. A connection point K3 between the switching element Qcu and the switching element Qcl is connected to the coil C.

  A connection point K4 between the switching element Qdu and the switching element Qdl is connected to the coil D. A connection point K5 between the switching element Qeu and the switching element Qel is connected to the coil E. A connection point K6 between the switching element Qfu and the switching element Qfl is connected to the coil F.

  The motor control unit 43 performs PWM control on each switching element of the six-phase inverter 42 and selectively applies a three-phase AC voltage and a six-phase AC voltage from the six-phase inverter 42 to the coils A to F.

  FIG. 3 is a diagram schematically showing an example of the three-phase AC voltages Vu, Vv, and Vw. FIG. 4 is a diagram schematically showing an example of the six-phase AC voltages Va, Vb, Vc, Vd, Ve, and Vf.

  As shown in FIG. 3, the three-phase AC voltages Vu, Vv, and Vw are sinusoidal voltages whose phases are sequentially shifted by 120 degrees. When applying the three-phase AC voltage, the six-phase inverter 42 applies the three-phase AC voltages Vu, Vv, Vw, Vu, Vv, and Vw to the coils A, B, C, D, E, and F, respectively. .

  The six-phase AC voltages Va, Vb, Vc, Vd, Ve, and Vf are sinusoidal voltages whose phases are sequentially shifted by 60 degrees as shown in FIG. The six-phase inverter 42 applies six-phase AC voltages Va, Vb, Vc, Vd, Ve, and Vf to the coils A, B, C, D, E, and F, respectively, when applying a six-phase AC voltage. . In the present embodiment, the motor 1 and the drive unit 40 constitute an example of a motor device.

(Operating principle)
With reference to FIG.1 and FIG.2, the operation principle of the motor 1 of 1st Embodiment is demonstrated. As described above, the rotor 20 of the motor 1 according to the first embodiment includes the plurality of salient poles 22 and the plurality of permanent magnets 23.

  When the six-phase AC voltages Va to Vf are applied to the coils A to F, the stator 10 generates a rotating magnetic field Mf6. On the other hand, a magnetic field is generated in the gap between the stator 10 and the rotor 20 by the plurality of permanent magnets 23. Hereinafter, the magnetic field directly generated by the permanent magnet 23 is referred to as a “basic magnetic field”. As described above, the number of pole pairs Nm of the permanent magnet 23 is 3, the number of slots Ns is 18, and a 6-pole 18-slot motor is configured. Therefore, the rotating magnetic field Mf6 (an example of the first rotating magnetic field) is magnetically coupled to the basic magnetic field and rotates the rotor 20.

Stator 10 generates rotating magnetic field Mf3 when three-phase AC voltages Vu, Vv, Vw, Vu, Vv, and Vw are applied to coils A to F, respectively. On the other hand, the basic magnetic field generated by the plurality of permanent magnets 23 is modulated by the plurality of salient poles 22. As a result, a modulated magnetic field is generated in the gap between the stator 10 and the rotor 20. That is, it is the same as the magnet in which the modulation magnetic field is generated virtually. The number of pole pairs Nh of this virtual magnet satisfies the formula (1).
Nh = (Np ± Nm) (1)
Since the number of pole pairs Nm of the permanent magnet 23 is 3 and the number of poles Np of the salient poles 22 is 15, the number of pole pairs Nh of the virtual magnet is 18 or 12.

  The magnetic field generated by the magnet having the number of slots Ns of 18 and the number of pole pairs of 18 is not magnetically coupled to the rotating magnetic field Mf3. On the other hand, the magnetic field generated by the magnet having the number of slots Ns of 18 and the number of pole pairs of 12 is magnetically coupled to the rotating magnetic field Mf3. Therefore, the rotating magnetic field Mf3 (an example of the second rotating magnetic field) is magnetically coupled to the modulation magnetic field and rotates the rotor 20.

(Restrictions)
The constraint conditions for establishing the operation principle of the motor 1 will be described. In the first embodiment, a three-phase AC voltage and a six-phase AC voltage are selectively applied to the coils A to F of the stator 10. For this reason, it is necessary to satisfy the constraint that the number of slots Ns of the stator 10 is a multiple of 6.

  In the motor 1 of the first embodiment, the rotating magnetic field Mf6 generated by the six-phase AC voltage (an example of the first AC voltage) and the basic magnetic field generated by the permanent magnet 23 of the rotor 20 are magnetically generated. Are connected. As a result, the rotating magnetic field Mf6 generated by the six-phase AC voltage rotates the rotor 20.

Therefore, it is necessary to satisfy Expression (2).
Nm = Ns / 6 or 5Ns / 6 (2)
Equation (2) is the pole of the permanent magnet 23 in which the basic magnetic field generated by the permanent magnet 23 and the rotating magnetic field Mf6 (an example of the first rotating magnetic field) are magnetically coupled under the number of slots Ns. This represents a constraint condition of logarithm Nm.

  In the motor 1 of the first embodiment, the rotating magnetic field Mf3 generated by the three-phase AC voltage (an example of the second AC voltage) and the modulated magnetic field in which the basic magnetic field is modulated by the salient pole 22 of the rotor 20 are: Magnetically coupled.

Therefore, it is necessary to satisfy Expression (3).
Np−Nm = Ns / 3 or 2Ns / 3 (3)
Equation (3) is set to a value that magnetically couples the modulated magnetic field in which the basic magnetic field is modulated by the salient pole 22 and the rotating magnetic field Mf3 (an example of the second rotating magnetic field) under the number of slots Ns. This represents a constraint condition of the number of poles Np of the salient poles 22 and the number of pole pairs Nm of the permanent magnets 23. In other words, the number of pole pairs (Np−Nm) of the virtual magnet is that the basic magnetic field generated by the virtual magnet and the rotating magnetic field Mf3 are magnetically reduced under the slot number Ns. The condition is that the value is set to be combined.

(Verification of operation principle)
In order to examine the validity of the operating principle of the motor 1 shown in FIG. 1, the result of analysis by the finite element method will be described.

  FIG. 5 is a diagram schematically showing a result of analyzing the induced voltage induced in the coils A to F by the finite element method when the rotor 20 of the motor 1 shown in FIG. 1 is forcibly rotated. The vertical axis in FIG. 5 represents the induced voltage, and the horizontal axis represents the rotation angle of the rotor 20. FIG. 6 is a diagram schematically showing a result of analyzing the result shown in FIG. 5 by fast Fourier transform (FFT). The vertical axis in FIG. 6 represents the induced voltage subjected to FFT, and the horizontal axis represents the calculated magnetic field order.

  In FIG. 5, since the rotor 20 is forcibly rotated, the motor 1 is operating as a generator. As shown in FIG. 5, an induced voltage having a complex waveform is induced in the coils A to F.

  As a result of analyzing the waveform of FIG. 5 by FFT, a third-order magnetic field and a twelfth-order magnetic field appear as main components as shown in FIG.

  The tertiary magnetic field corresponds to a basic magnetic field generated by the permanent magnet 23 having a pole pair number Nm of 3. This tertiary magnetic field, that is, the basic magnetic field, is magnetically coupled to the rotating magnetic field Mf6 (FIG. 1) due to the six-phase AC voltage.

  The twelfth order magnetic field corresponds to a modulation magnetic field generated by a virtual magnet having a pole pair number Nh of 12. This 12th-order magnetic field, that is, the modulation magnetic field, is magnetically coupled to the rotating magnetic field Mf3 (FIG. 1) by the three-phase AC voltage.

  Therefore, it can be seen that the rotor 20 shown in FIG. 1 rotates when the three-phase AC voltage and the six-phase AC voltage are selectively applied to the coils A to F of the stator 10. The analysis results shown in FIGS. 5 and 6 show that the above-described operation principle is appropriate.

(Operation example)
FIG. 7 is a diagram schematically showing the torque of the rotor 20 when a three-phase AC voltage and a six-phase AC voltage are selectively applied to the coils A to F. FIG. The vertical axis in FIG. 7 represents torque, and the horizontal axis represents the rotation angle of the rotor 20. In FIG. 7, a current having an effective value of 20 [A] is supplied to the coils A to F.

  FIG. 7 shows a torque T3 when a three-phase AC voltage is applied to the coils A to F and a torque T6 when a six-phase AC voltage is applied to the coils A to F. . As can be seen from FIG. 7, the torque T3 is larger than the torque T6. In the present embodiment, the torque T6 corresponds to an example of the first torque, and the torque T3 corresponds to an example of the second torque. The torque T6 corresponds to an example of the lower torque of the first torque and the second torque, and the torque T3 corresponds to an example of the higher torque of the first torque and the second torque.

  In FIG. 7, the torque constant when a three-phase AC voltage is applied to the coils A to F is 0.64 [Nm / A]. The torque constant when the six-phase AC voltage is applied to the coils A to F is 0.099 [Nm / A], which is lower than the torque constant when the three-phase AC voltage is applied. . In the present embodiment, the torque constant when a three-phase AC voltage is applied is an example of a second torque constant, and the torque constant when a six-phase AC voltage is applied is an example of a first torque constant. .

  The torque (torque constant) is changed by adjusting the height of the salient pole 22, the thickness of the permanent magnet 23, the thickness of the salient pole 22, the amplitude of the three-phase AC voltage, the amplitude of the six-phase AC voltage, etc. can do. Therefore, a desired torque can be obtained as the first torque and the second torque by performing the above adjustment.

(Function and effect)
As described above, in the motor 1 of the first embodiment, the case where a three-phase AC voltage is applied to the coils A to F and the case where a six-phase AC voltage is applied to the coils A to F are different. Torque (torque constant) can be obtained. For this reason, it is possible to realize a motor having two types of NT characteristics of low speed and high torque and high speed and low torque.

(Second Embodiment)
The motor 1 of the first embodiment can be applied to various devices. In the second embodiment, a washing machine will be described as an example of a device to which the motor 1 of the first embodiment is applied.

  FIG. 8 is a block diagram schematically showing the configuration of the washing machine of the second embodiment. A washing machine 100 according to the second embodiment includes the motor 1 according to the first embodiment. The washing machine 100 will be described with reference to FIG. In addition, the solid line arrow shown in FIG. 8 represents the flow of water. The dashed-dotted arrow shown by FIG. 8 represents the transmission path | route of a control signal.

  The washing machine 100 includes a main housing 200, a controller 300, a water supply mechanism 400, a washing mechanism 500, and a circulation mechanism 600. The main housing 200 accommodates the control unit 300, the water supply mechanism 400, the washing mechanism 500, and the circulation mechanism 600. The control unit 300 includes a washing control unit 310 and the driving unit 40 described in the first embodiment.

  The washing mechanism 500 includes a storage tank 510 in which clothing is stored, and the motor 1 described in the first embodiment. The motor 1 drives the storage tank 510 under the control of the washing control unit 310 and the motor control unit 43. In the washing process, the storage tank 510 stirs the clothes in a liquid containing a detergent. As a result, the garment is properly washed. When the washing process is completed, the water is drained and the process proceeds to a rinsing process. A dehydration process may be performed between the washing process and the rinsing process.

  In the rinsing process, the storage tank 510 stirs the clothes in water having a lower detergent concentration than in the washing process. Further, in the rinsing process, water supply to the storage tank 510 and drainage from the storage tank 510 are repeated. As a result, the detergent is properly removed from the garment.

  In the dehydration process after the rinsing process, the storage tank 510 dehydrates the clothes using centrifugal force. As a result, drying of clothes is promoted. After the dehydration step is completed, the rinsing step may be performed again. That is, the rinsing process and the dehydrating process may be repeated a plurality of times. In addition, the duration of each dehydration process in the dehydration process performed between the washing process and the rinsing process, the intermediate dehydration process when the rinsing process is repeated a plurality of times, and the final dehydration process after the last rinsing process is completed May be the same value or different values.

  The water supply mechanism 400 supplies water to the storage tank 510 in the above-described washing process and rinsing process. The water supply mechanism 400 includes a water supply port 410 connected to the faucet, a switching valve 420, and a detergent storage unit 430 in which a detergent is stored. The water supplied to the water supply port 410 reaches the switching valve 420. The switching valve 420 switches the water supply path between the first water supply path 421 in which the water goes directly to the storage tank 510 and the second water supply path 422 in which water is supplied to the storage tank 510 through the detergent storage unit 430. Switch.

  The first water supply path 421 may be used, for example, in a rinsing process. As a result, tap water is directly supplied to the storage tank 510. The 2nd water supply path 422 may be used for a washing process, for example. When the switching valve 420 opens the second water supply path 422, water flows into the detergent container 430. In the detergent container 430, water and detergent are mixed. As a result, water containing the detergent flows into the storage tank 510.

  The circulation mechanism 600 includes a circulation pump 610. The circulation mechanism 600 may circulate water between the circulation pump 610 and the storage tank 510 in the above-described washing process and rinsing process. In the present embodiment, the circulation mechanism 600 includes a circulation path 620 for circulating water between the circulation pump 610 and the storage tank 510.

  FIG. 9 is a schematic perspective view of the washing machine 100. The washing machine 100 will be further described with reference to FIGS. 8 and 9.

  The main housing 200 is opposite to the front wall 210, the rear wall 220 opposite to the front wall 210, the left wall 230 erected between the front wall 210 and the rear wall 220, and the left wall 230. And a top wall 250 surrounded by the upper edges of the front wall 210, the rear wall 220, the left wall 230 and the right wall 240, and a bottom wall 260 opposite to the top wall 250. The water supply port 410 described with reference to FIG. 8 is exposed on the top wall 250. The user can connect the water supply port 410 and the faucet (not shown) using, for example, a hose.

  The washing machine 100 further includes a door body 101 attached to the front wall 210. The door body 101 rotates between a closed position along the front wall 210 and an open position protruding from the front wall 210. Note that the door body 101 shown in FIG. 9 is in the open position. When the door body 101 is in the open position, the insertion port 511 defined by the storage tank 510 is exposed. The user can rotate the door body 101 to the open position, and can put the clothes into the storage tank 510 through the input port 511, and can take out the clothes from the storage tank 510.

  FIG. 10 is a schematic cross-sectional view of the washing machine 100. The washing machine 100 will be further described with reference to FIGS. 8 and 10.

  The storage tank 510 includes a rotating drum 530 in which clothing is stored and a water tank 540 in which the rotating drum 530 is stored. The rotary drum 530 includes an inner ring wall 531 that defines the inlet 511, an inner bottom wall 532 opposite to the inner ring wall 531, and a cylindrical inner peripheral wall between the inner ring wall 531 and the inner bottom wall 532. 533. The water tank 540 includes an outer ring wall 541 disposed between the front wall 210 and the inner ring wall 531, an outer bottom wall 542 disposed between the rear wall 220 and the inner bottom wall 532, and the outer ring wall 541. And an outer peripheral wall 543 surrounding the inner peripheral wall 533 between the outer bottom wall 542 and the outer bottom wall 542.

  On the bottom wall 260 of the housing 100, for example, a hollow cylindrical guide rod 550 is erected. For example, a cylindrical support bar 551 is fitted into the guide bar 550. The support bar 551 is supported on the bottom wall 260 inside the guide bar 550 via, for example, a spring (not shown). The upper end of the support bar 551 is in contact with the water tank 540, and the support bar 551 supports the water tank 540. As the amount of clothing put into the storage tub 510 increases, the gravity applied to the spring increases, so the position of the upper end of the support bar 551 decreases.

  The transmission shaft 2 of the motor 1 passes through the outer bottom wall 542 and is connected to the inner bottom wall 532. The driving force of the motor 1 is transmitted to the rotating drum 530 through the transmission shaft 2. The transmission shaft 2 is disposed at a position that coincides with the rotation axis P0 (FIG. 1) of the motor 1.

  In addition to the circulation pump 610, the circulation mechanism 600 is connected to the drain valve 690, the upstream circulation pipe 640 that defines the path of water flowing from the water tank 540 to the circulation pump 610, and the outer ring wall 541. A downstream circulation pipe 650 that defines a path of water returning to 540 and a drain pipe 660 that defines a drain path to the outside of the main housing 200 are provided.

  The drain valve 690 is attached to the drain pipe 660. The washing control unit 310 (see FIG. 8) controls the drain valve 690. While water is being circulated between the storage tank 510 and the circulation pump 610, the washing control unit 310 closes the drain valve 690. The washing control unit 310 opens the drain valve 690 in order to discharge unnecessary water.

  The downstream circulation pipe 650 receives the water discharged from the circulation pump 610 and defines the circulation path 612 described with reference to FIG.

  Returning to FIG. 8, the DC power supply 41 of the drive unit 40 generates a DC voltage of DC 12 V from, for example, a commercial power supply of AC 100 V in the second embodiment.

  When the instruction signal for executing the washing process and the instruction signal for executing the rinsing process are input from the washing control unit 310, the motor control unit 43 of the driving unit 40 generates the three-phase AC voltages Vu, Vv, and Vw. Applied to the 6-phase inverter 42. Accordingly, as described with reference to FIG. 7, the motor 1 is rotated at a high torque constant (that is, low speed and high torque).

  When an instruction signal for executing the dehydration process is input from the washing control unit 310, the motor control unit 43 applies the six-phase AC voltages Va to Vf to the six-phase inverter 42. Accordingly, as described with reference to FIG. 7, the motor 1 is rotated with a low torque constant (that is, high speed and low torque).

  In addition, the washing control part 310 and the motor control part 43 may be comprised by one microcomputer, for example, and may be comprised by a separate microcomputer.

  FIG. 11 is a flowchart schematically showing the operation of the washing machine 100 controlled by the control unit 300. The operation of the washing machine 100 will be described with reference to FIGS. 2 and 8 to 11.

  When the user instructs the start of the washing operation, the operation of FIG. 11 is started. First, in step S110, the laundry control unit 310 executes a washing process. In the washing process, the washing control unit 310 controls the water supply mechanism 400 and opens the water supply port 410. In addition, the laundry control unit 310 controls the switching valve 420 to open the second water supply path 422 to the detergent storage unit 430. As a result, water flows into the detergent container 430. The detergent in the detergent container 430 dissolves in water. Thereafter, the water containing the detergent flows into the storage tank 510. When a predetermined amount of water is supplied to the storage tank 510 through the detergent storage unit 430, the laundry control unit 310 controls the circulation pump 610 to circulate water between the circulation pump 610 and the storage tank 510. . As a result of the circulation of water between the circulation pump 610 and the storage tank 510, the detergent concentration in the water sent from the water supply mechanism 400 is made uniform. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  The motor control unit 43 controls the 6-phase inverter 42 according to the instruction signal from the washing control unit 310, and applies the 3-phase AC voltages Vu, Vv, Vw from the 6-phase inverter 42 to the coils A to F. As a result, the motor 1 (rotor 20) is rotationally driven with a high torque constant to rotate the rotating drum 530. As a result, the clothes are agitated in the rotating drum 530. Therefore, the water containing the detergent comes into uniform contact with the entire clothing in the storage tank 510.

  When the predetermined washing end condition is satisfied, the washing control unit 310 ends the washing process, and in the subsequent step S140, the washing control unit 310 executes the rinsing process. When the washing process is completed, the water is drained and the process proceeds to the rinsing process. A dehydration process may be performed between the washing process and the rinsing process.

  In the rinsing process, the washing control unit 310 controls the switching valve 420 to open the first water supply path 421 to the storage tank 510. As a result, the water flows directly into the storage tank 510 without flowing into the detergent container 430. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  In the rinsing process, the motor control unit 43 responds to the instruction signal from the washing control unit 310 in the same manner as the washing process (step S130), and the three-phase AC voltages Vu, Vv, Vw is applied. As a result, the motor 1 (rotor 20) is rotationally driven with a high torque constant to rotate the rotating drum 530. As a result, the clothes are agitated in the rotating drum 530. Therefore, the water not containing the detergent comes into uniform contact with the entire clothing in the storage tank 510. This properly removes the detergent from the garment.

  When the predetermined rinsing end condition is satisfied, the washing control unit 310 ends the rinsing process, and in the subsequent step S150, the washing control unit 310 executes the dehydration process. In the dehydration process, the washing control unit 310 controls the switching valve 420 to close the first water supply path 421 to the storage tank 510. As a result, water does not flow into the storage tank 510. In addition, the laundry control unit 310 outputs an instruction signal for instructing the rotation of the rotary drum 530 to the motor control unit 43.

  The motor control unit 43 controls the 6-phase inverter 42 according to the instruction signal from the washing control unit 310 and applies the 6-phase AC voltages Va to Vf from the 6-phase inverter 42 to the coils A to F. As a result, the motor 1 (rotor 20) is rotationally driven with a low torque constant to rotate the rotary drum 530. As a result, the water contained in the garment is appropriately removed from the garment using centrifugal force, and the drying of the garment is promoted.

  When the predetermined dehydration end condition is satisfied, the laundry control unit 310 ends the dehydration process. In addition, the washing control unit 310 outputs an instruction signal that instructs the stop of the rotary drum 530 to the motor control unit 43. The motor control unit 43 stops the rotation of the motor 1 (rotor 20) in response to an instruction signal from the washing control unit 310. As a result, the operation of FIG. 11 ends. Note that the rinsing step may be performed again after the dehydration step. That is, the rinsing process and the dehydrating process may be repeated a plurality of times.

  In the second embodiment, the rotating drum 530 is rotated using the motor 1 of the first embodiment. Therefore, it is possible to rotate the rotating drum 530 at an appropriate rotation speed and torque in the case where the rotating drum 530 is rotated in the washing step and the rinsing step and in the case where the rotating drum 530 is rotated in the dehydration step, respectively. Yes.

(Other)
(1) In the first embodiment, the number of slots Ns, the number of poles Np of the salient poles 22, and the number of pole pairs Nm of the permanent magnets 23 are Ns = 18, Np = 15, Nm = 3, as shown in FIG. However, it is not limited to this. In short, it is only necessary that the above constraints, that is, the number of slots Ns is a multiple of 6, and the expressions (2) and (3) are satisfied.

  For example, Ns = 18, Np = 9, and Nm = 3 may be used. In this case, Np−Nm = 9−3 = 6. Therefore, the modulation magnetic field generated by the 18-slot virtual magnet having 6 pole pairs (12 poles) is magnetically coupled to the rotating magnetic field Mf3 generated by the three-phase AC voltage. The number Nm of pole pairs of the permanent magnet 23 is Nm = 3, which is the same as that in the first embodiment. Therefore, as in the first embodiment, the basic magnetic field generated by the permanent magnet 23 with 3 pole pairs (6 poles) and 18 slots is a rotating magnetic field Mf6 generated by a six-phase AC voltage, and a magnetic field. Join.

  (2) In the first embodiment, the rotating magnetic field Mf6 generated by the six-phase AC voltage and the basic magnetic field generated by the permanent magnet 23 of the rotor 20 are magnetically coupled and generated by the three-phase AC voltage. The rotating magnetic field Mf3 and the modulated magnetic field in which the basic magnetic field is modulated by the salient pole 22 of the rotor 20 are magnetically coupled. However, it is not limited to this, and the reverse may be possible.

  That is, the rotating magnetic field Mf3 generated by the three-phase AC voltage (an example of the first AC voltage) and the basic magnetic field generated by the permanent magnet 23 of the rotor 20 are magnetically coupled, and the six-phase AC voltage (first The rotating magnetic field Mf6 generated by the example of the two AC voltages may be magnetically coupled to the modulated magnetic field in which the basic magnetic field is modulated by the salient poles 22 of the rotor 20.

In this case, it is necessary to satisfy Expression (4).
Nm = Ns / 3 or 2Ns / 3 (4)
Equation (4) is the pole of the permanent magnet 23 in which the basic magnetic field generated by the permanent magnet 23 and the rotating magnetic field Mf3 (an example of the first rotating magnetic field) are magnetically coupled under the number of slots Ns. This represents a constraint condition of logarithm Nm.

Moreover, it is necessary to satisfy | fill Formula (5).
Np-Nm = Ns / 6 or 5Ns / 6 (5)
Equation (5) is set to a value that magnetically couples a modulated magnetic field in which the basic magnetic field is modulated by the salient poles 22 and the rotating magnetic field Mf6 (an example of the second rotating magnetic field) under the number of slots Ns. This represents a constraint condition of the number of poles Np of the salient poles 22 and the number of pole pairs Nm of the permanent magnets 23.

  For example, the number of slots Ns may be kept at 18, the number of poles Np of the salient poles 22 may be set to 9, and the number of pole pairs Nm of the permanent magnets 23 may be set to 6. In this case, the basic magnetic field generated by the permanent magnet 23 is 12 poles and 18 slots. This basic magnetic field is magnetically coupled to a rotating magnetic field Mf3 (an example of a first rotating magnetic field) generated by a three-phase AC voltage. Thus, the rotating magnetic field Mf3 generated by the three-phase AC voltage rotates the rotor 20.

  Further, Np−Nm = 9−6 = 3. For this reason, the basic magnetic field generated by the 18-slot virtual magnet with 3 pole pairs (6 poles) is a rotating magnetic field Mf6 (an example of a second rotating magnetic field) generated by a six-phase AC voltage, and magnetically To join. Thereby, the rotating magnetic field Mf6 generated by the six-phase AC voltage rotates the rotor 20.

  (3) The washing machine 100 of the second embodiment does not include a drying mechanism. Alternatively, the washing machine 100 may include a drying mechanism. 20 shows a washing machine in which the rotating shaft of the rotating drum 530 is inclined, the rotating shaft of the rotating drum 530 may be horizontal, or the rotating drum 530 may be a so-called vertical washing machine. The rotation axis may be vertical.

  (4) In the said 2nd Embodiment, the washing machine 100 provided with the motor 1 of 1st Embodiment is illustrated. Alternatively, it may be a train including the motor 1, an electric vehicle, or a hybrid vehicle. In such a motor for driving a vehicle, a low speed and high torque characteristic is required when the vehicle starts, and a high speed and low torque characteristic is required when the vehicle speed increases. By providing the motor 1 of the first embodiment, the required characteristics as described above can be realized.

  The motor of the present disclosure is useful for devices that require a motor having NT characteristics of both low speed and high torque and high speed and low torque.

DESCRIPTION OF SYMBOLS 1 Motor 2 Transmission shaft 10 Stator 11 Slot 20 Rotor 20a Rotor core 21 Core part 22 Salient pole 23 Permanent magnet 41 DC power supply 42 6-phase inverter 43 Motor control part 100 Washing machine 300 Control part 310 Washing control part 530 Rotating drum

Claims (9)

When one of the three-phase AC voltage and the six-phase AC voltage is selectively output, a first rotating magnetic field is generated and the other one of the three-phase AC voltage and the six-phase AC voltage is generated. A stator that generates a second rotating magnetic field when two alternating voltages are selectively output;
A rotor rotating around a predetermined rotation axis in the stator;
With
The rotor is
A rotor core including a cylindrical core portion and a plurality of salient poles formed to protrude from the peripheral surface of the core portion toward the stator;
A plurality of magnets arranged inside the peripheral surface of the core portion;
Have
The plurality of salient poles are formed around the rotation axis,
The plurality of magnets are arranged around the rotation axis,
The first rotating magnetic field is magnetically coupled with a basic magnetic field generated by the plurality of magnets, and rotates the rotor with a first torque.
The second rotating magnetic field is magnetically coupled to a modulation magnetic field in which the basic magnetic field is modulated by the plurality of salient poles, and rotates the rotor with a second torque different from the first torque.
motor. The first rotating magnetic field is rotated at the first torque by rotating the rotor at a first torque constant,
The second rotating magnetic field is rotated at the second torque by rotating the rotor at a second torque constant;
The motor according to claim 1. The stator includes a coil portion to which the three-phase AC voltage and the six-phase AC voltage are selectively applied, and a number of slots Ns (Ns is a multiple of 6) formed around the rotating shaft. ) Slot, and
The plurality of salient poles defines a pole number Np (Np is an integer of 2 or more),
The plurality of magnets define a pole pair number Nm (Nm is a positive integer),
The pole pair number Nm is set to a value at which the first rotating magnetic field rotates the rotor under the slot number Ns.
The number of pole pairs (Np−Nm) is set to a value at which the second rotating magnetic field rotates the rotor under the slot number Ns.
The motor according to claim 1 or 2. The first alternating voltage is the six-phase alternating voltage,
The second AC voltage is the three-phase AC voltage,
Nm = Ns / 6 or 5Ns / 6,
Np−Nm = Ns / 3 or 2Ns / 3.
The motor according to claim 3. The first AC voltage is the three-phase AC voltage,
The second AC voltage is the six-phase AC voltage,
Nm = Ns / 3 or 2Ns / 3,
Np−Nm = Ns / 6 or 5Ns / 6.
The motor according to claim 3. The plurality of salient poles are provided at equal intervals around the rotation axis, and include a first salient pole and a second salient pole adjacent to the first salient pole,
The first salient pole includes a first side surface defined by a surface extending radially from the rotation axis, and a second side surface defined by a surface extending radially from the rotation axis and opposite to the first side surface. Have
The second salient pole has a third side surface opposed to the second side surface, which is defined by a surface extending radially from the rotation axis,
A central angle formed by the first side surface, the rotation shaft, and the second side surface is equal to a central angle formed by the second side surface, the rotation shaft, and the third side surface.
The motor according to any one of claims 1 to 5. The motor according to any one of claims 1 to 6,
A drive unit that selectively outputs the three-phase AC voltage and the six-phase AC voltage;
With
The stator includes a first phase coil portion, a second phase coil portion, a third phase coil portion, a fourth phase coil portion, a fifth phase coil portion, and a sixth phase coil portion that are connected to each other. Including
The driving unit outputs three-phase AC voltages Vu, Vv, and Vw whose phases are sequentially shifted by 120 degrees as the three-phase AC voltages, and the phases are sequentially shifted by 60 degrees as the six-phase AC voltages. Output 6-phase AC voltages Va, Vb, Vc, Vd, Ve, Vf,
The three-phase AC voltage Vu and the six-phase AC voltage Va are selectively applied to the first phase coil unit,
The three-phase AC voltage Vv and the six-phase AC voltage Vb are selectively applied to the second phase coil unit,
The three-phase AC voltage Vw and the six-phase AC voltage Vc are selectively applied to the third-phase coil unit,
The fourth phase coil unit is selectively applied with the three-phase AC voltage Vu and the six-phase AC voltage Vd,
The third phase AC voltage Vv and the six phase AC voltage Ve are selectively applied to the fifth phase coil portion,
The six-phase coil unit is selectively applied with the three-phase AC voltage Vw and the six-phase AC voltage Vf.
Motor device. The drive unit is
A six-phase inverter having a first phase switching element to a sixth phase switching element connected to the first phase coil unit to the sixth phase coil unit and connected in parallel to a DC power source;
An inverter control unit for selectively generating the three-phase AC voltage and the six-phase AC voltage by performing PWM control on the first-phase switching element to the sixth-phase switching element;
including,
The motor device according to claim 7. The motor device according to claim 7 or 8,
A rotating drum in which clothing is housed;
A washing control unit that performs a washing step of washing the clothing, a rinsing step of rinsing the clothing, and a dehydration step of dehydrating the clothing;
With
The motor device further includes a transmission shaft that is disposed at a position that coincides with the rotation axis and that is connected to the rotor and transmits the rotation of the rotor to the outside.
The transmission shaft is connected to the rotating drum;
The driving unit selectively outputs the three-phase AC voltage and the six-phase AC voltage, and in the washing step and the rinsing step, the higher torque of the first torque and the second torque is used. The rotor is rotated, and in the dehydration step, the rotor is rotated with a lower torque of the first torque and the second torque.
Washing machine.