JP5292530B2 - Brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the ricketiness of a rotor to a stator when a single drive shaft is driven by a plurality of stages of motors and enables an outer-rotor type brushless motor to output large power, to be reduced in size, and to rotate at high speed. <P>SOLUTION: The center of a drive wheel 21 is fixed to the outer periphery of a drive shaft 2, and extends in the direction of radius of the drive shaft 2. A rotor back yoke 25 making up rotors 26 and 27 is a cylindrical member, and is fixed to the outer periphery of the drive wheel 21 to extend from the drive wheel 21 to both axial sides of the drive shaft 2 in concentric with the drive shaft 2. The rotors 26 and 27 are disposed on the outer peripheries of the stators 15 and 16, respectively. Bearings 33 and 34 support the rotors 26 and 27 from both axial sides of the drive shaft 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a brushless motor, and more particularly to an outer rotor type brushless motor in which a rotor rotates on the outer peripheral side of a stator.

  An outer rotor type brushless motor is widely used as a brushless motor capable of obtaining a large torque (see, for example, Patent Document 1).

JP 05-328687

  When such an outer rotor type brushless motor is used as a driving source for, for example, a manned small glider with low air resistance, the motor diameter is reduced due to the installation space while maintaining a large output. And I want to be able to drive with a low-power battery.

  However, in an outer rotor type brushless motor, if a large output is to be obtained, the diameter size of the motor increases, and if the diameter size increases, the rotational speed decreases.

  Therefore, it is conceivable to drive a single drive shaft with a plurality of stages of motors as means for maintaining a small motor diameter and maintaining a high rotational speed despite obtaining a large output.

  As a result, although the individual motors are small and the diameter size remains small, a large output can be obtained because one drive shaft is driven by a plurality of stages of motors. Further, since the diameter size of each motor remains small, the rotation speed can be kept high. Furthermore, since each motor is small, each motor can be driven by a low-power battery.

  In this case, it can be considered that one drive shaft is rotated by a plurality of motors by attaching rotors of a plurality of motors to a single drive wheel fixed to one drive shaft.

  However, if the rotor of each motor is rotated at a high speed with such a structure, the rotor may be largely rattled with respect to the stator.

  Accordingly, an object of the present invention is to prevent the rattling of the rotor when the single drive shaft is driven by a plurality of stages of motors, while maintaining the large output, small diameter size, and high speed rotation of the outer rotor type brushless motor. It is possible to achieve both.

The invention of claim 1 of the present application is
A drive shaft;
A plurality of stators disposed on the outer periphery of the drive shaft;
A drive wheel having a central portion fixed to the outer periphery of the drive shaft and extending in the drive shaft radial direction;
A plurality of cylindrical shapes that are respectively fixed to the outer periphery of the drive wheel, extend from the drive wheel to both sides of the drive shaft in a concentric manner with the drive shaft, and are respectively disposed on the outer periphery of the stator. The rotor,
A plurality of bearings for supporting the plurality of rotors from both axial sides of the drive shaft; and a plurality of bearings for supporting the drive shaft from both axial sides of the drive shaft;
Equipped with a,
The length of the outer diameter of each rotor in the plurality of rotors is a brushless motor that is shorter than the axial length of a cylindrical body integrated by fixing the plurality of rotors to the outer periphery of the drive wheel. .

The invention of claim 2
A drive shaft;
A plurality of stators disposed on the outer periphery of the drive shaft;
A drive wheel having a central portion fixed to the outer periphery of the drive shaft and extending in the drive shaft radial direction;
A plurality of cylindrical shapes that are respectively fixed to the outer periphery of the drive wheel, extend from the drive wheel to both sides of the drive shaft in a concentric manner with the drive shaft, and are respectively disposed on the outer periphery of the stator. The rotor,
A plurality of bearings for supporting the plurality of rotors from both axial sides of the drive shaft; and a plurality of bearings for supporting the drive shaft from both axial sides of the drive shaft;
With
The length of the outer diameter of each rotor in the plurality of rotors is shorter than the axial length of the cylindrical body integrated by fixing the plurality of rotors to the outer peripheral portion of the drive wheel,
Furthermore, the number of stators is three or more, and the one rotor is disposed on the outer periphery of two or more stators.

The invention of claim 3
A drive shaft;
A plurality of stators disposed on the outer periphery of the drive shaft;
A drive wheel having a central portion fixed to the outer periphery of the drive shaft and extending in the drive shaft radial direction;
A plurality of cylindrical shapes that are respectively fixed to the outer periphery of the drive wheel, extend from the drive wheel to both sides of the drive shaft in a concentric manner with the drive shaft, and are respectively disposed on the outer periphery of the stator. The rotor,
A plurality of bearings for supporting the plurality of rotors from both axial sides of the drive shaft;
A plurality of bearings for supporting the drive shaft from both axial sides of the drive shaft;
Equipped with a,
The length of the outer diameter of each rotor in the plurality of rotors is such that the plurality of brushless motors are shorter than the axial length of the cylindrical body integrated by fixing the plurality of rotors to the outer periphery of the drive wheel. While providing a stand,
Each of the plurality of brushless motors has a drive shaft that is common to the plurality of brushless motors, and the drive shaft is driven by the plurality of brushless motors.

The invention of claim 4
The brushless according to any one of claims 1 to 3, wherein a stopper ring and a thrust nut are fixed on an outer periphery on one end side of the drive shaft, and a thrust ring is provided integrally with the drive shaft on the other side. It is a motor.

  According to the first aspect of the present invention, a plurality of motors including a pair of rotors and stators are provided in a plurality of stages, and one drive shaft can be driven by the plurality of motors. Although a large output can be obtained as in the case of driving one drive shaft with this motor, the diameter size of each motor can be reduced and the rotation speed can be kept high.

  A plurality of cylindrical rotors extending concentrically with the drive shaft on both sides of the drive shaft from the drive wheel fixed to the drive shaft are supported by bearings from both sides of the drive shaft. Therefore, even if the plurality of cylindrical rotors extend from the drive wheel to both sides in the drive shaft direction, it is possible to prevent the rotor from rattling against the stator.

  Furthermore, according to the invention of claim 2 or 3, in addition to the effect of claim 1, the output is further increased by increasing the number of stators or providing a plurality of brushless motors on one drive shaft. Since a brushless motor that rotates at high speed can be realized, it can be used for applications that require high output, such as manned and small gliders with low air resistance.

  Further, according to the invention of claim 4, in addition to the effect of the invention of claim 1, the drive shaft is fixed with a stopper ring, a thrust nut, and a thrust ring, thereby preventing the drive shaft from rattling in the axial direction. It becomes possible to prevent.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a brushless motor according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the brushless motor. 12 is an external view of the brushless motor of FIG.
FIG. 1 is a longitudinal sectional view taken along the dashed line AA shown in FIG.

  The brushless motor 1 is an outer rotor type sensorless brushless motor or a brushless motor with a sensor, and can drive one drive shaft 2 (output shaft) by two motors 3 and 4. When the brushless motor 1 is a brushless motor with a sensor, the sensor may be a Hall element sensor or the like.

  The drive shaft 2 is inserted through the center of the brushless motor 1. Guide plates 11 and 12 (see FIG. 3) are disposed on both sides of the drive shaft 2 in the axial direction, and the drive shaft 2 is inserted through the center holes 11a and 12a of the guide plates 11 and 12, respectively. The guide plate 11 is fixed to one end of four guide poles 23 with screws 24, and the guide plate 12 is fixed to the other end of four guide poles 23 with screws 24 (see FIG. 2). ).

  A spindle case 13 of the motor 3 and a spindle case 14 (see FIG. 4) of the motor 4 are fixed to the guide plates 11 and 12, respectively. A stator 15 of the motor 3 and a stator 16 (see FIG. 5) of the motor 4 are fixed to the outer circumferences of the spindle cases 13 and 14, respectively. Center holes 15a and 16a for inserting spindle cases 13 and 14 are provided at the centers of the stators 15 and 16, and the spindle cases 13 and 14 are inserted into the center holes 15a and 16a, respectively. Therefore, the stators 15 and 16 are disposed on the outer periphery of the drive shaft 2. The stators 15 and 16 are provided with winding coils 17 and 18, respectively. Further, the guide plates 11 and 12 are provided with holes 11b and 12b as shown in FIG. 3, and lead wires 36 (see FIG. 12) of the winding coils 17 and 18 are provided from the holes 11b and 12b to the motor 3 and 12. 4 Pulled out. At the same time, the holes 11b and 12b are provided as heat release holes for releasing heat generated in the motors 3 and 4 when the motors 3 and 4 are driven.

  Four bearings 19 are interposed between the spindle cases 13 and 14 and the drive shaft 2, and the drive shaft 2 can stably rotate in the center holes 13 a and 14 a of the spindle cases 13 and 14. it can. A stopper ring 42 and a thrust nut 43 are fixed on the outer periphery on one end side of the drive shaft 2, and a thrust ring 41 is provided integrally with the drive shaft 2 on the other side so that the drive shaft 2 Prevents backlash in the axial direction.

As shown in FIG. 6, a key groove 2 a is formed in the vicinity of the central portion in the axial direction of the drive shaft 2. Returning to FIGS. 1 and 2, the drive wheel 21, which is a wheel-shaped rotating member, is fixed to the outer periphery of the drive shaft 2 at the center via a key block 22 fitted in the key groove 2 a.
As shown in FIG. 7, a center hole 21a for inserting the drive shaft 2 is provided at the center of the drive wheel 21, and a groove 21b for fitting with the key block 22 is provided at a part of the outer periphery of the center hole 21a. Yes.
Thus, the drive wheel 21 fixed to the outer periphery of the drive shaft 2 extends in the radial direction of the drive shaft 2.

  A cylindrical rotor back yoke 25 (see FIG. 8) is fixed to the outer periphery of the drive wheel 21 at its inner periphery. The rotor back yoke 25 extends concentrically with the drive shaft 2 from the drive wheel 21 to both sides in the axial direction of the drive shaft 2, and one of the extended portions serves as the rotor 26 of the motor 2, and the other It becomes the rotor 27 of the motor 3. That is, the magnet guide 28 (see FIG. 9) and the magnet guide 31 (see FIG. 9) are attached to the inner periphery of the rotor back yoke 25 on the rotor 26 side, and the magnet 29 is attached to the magnet guide 28 and the magnet guide 31. It is fixed. Similarly, a magnet guide 31 (see FIG. 9) and a magnet guide 28 (see FIG. 9) are attached to the inner periphery of the rotor back yoke 25 on the rotor 27 side, and a magnet 32 is attached to the magnet guide 31 and the magnet guide 28. Is fixed. The rotor 26 that is one of the rotor back yokes 25 is disposed on the outer periphery of the stator 15, and the other rotor 27 is disposed on the outer periphery of the stator 16.

  A bearing 33 serving as a bearing member is interposed between the inner peripheral portion of the end portion on the rotor 26 side of the rotor back yoke 25 and the outer periphery of the guide plate 11, and the end portion on the rotor 27 side of the rotor back yoke 25. A bearing 34 serving as a bearing member is interposed between the inner periphery of the guide plate 12 and the outer periphery of the guide plate 12. Thus, the rotors 26 and 27 of the rotor back yoke 25 are supported by bearings 33 and 34 interposed in the guide plates 11 and 12 from both sides in the axial direction of the drive shaft 2.

  In the brushless motor 1 having the above-described configuration, when the winding coils 17 and 18 are energized, a magnetic action is generated between the winding coils 17 and 18 and the magnetic poles of the magnets 29 and 32 so that the rotors 26 and 27 are moved. Rotate and rotate the drive shaft 2 via the drive wheel 21.

  The brushless motor 1 is of a sensorless type, and the winding coils 17 and 18 are measured by measuring the potential of a midpoint wiring (not shown) of the motor without using a Hall element to detect the position of the motor. It is driven by detecting the induced voltage generated at the position to obtain position information. However, when the brushless motor 1 is a brushless motor with a sensor, the sensor may be a Hall element sensor or the like.

  This brushless motor 1 is provided with two motors 3 and 4 including a pair of rotors and stators in two stages, and the two motors 3 and 4 can drive one drive shaft 2. Therefore, the diameter of each motor 3 and 4 is reduced and the rotation speed is kept high, even though a large output can be obtained in the same way as when one drive shaft is driven by one large-diameter motor. can do. Furthermore, since the individual motors 3 and 4 have a small diameter size, they can be driven by a low-power battery.

  A plurality of cylindrical rotors 26 and 27 extending concentrically with the drive shaft 2 from the drive wheel 21 fixed to the drive shaft 2 to both sides in the axial direction of the drive shaft 2 are connected to the drive shaft 2. Since the bearings 33 and 34 are supported from both sides in the axial direction, the cylindrical rotors 26 and 27 extend from the drive wheel 21 to both sides in the axial direction of the drive shaft 2, respectively. 27 can prevent the stators 15 and 16 from rattling.

As shown in FIG. 10, a plurality of the brushless motors 1 described above are provided (two examples are shown in FIG. 10 and the other is shown as a brushless motor 10). Each drive shaft is a common drive shaft 2 between the brushless motors 1 and 10,
One drive shaft 2 may be driven by the two brushless motors 1 and 10, or the number of brushless motors 1 may be further increased to three or more. Similarly to the brushless motor 1, the brushless motor 10 is also driven by two motors 5 and 6. In addition, a certain width is provided between the brushless motors 1 and 10 by the spacer 40. This width is a gap provided to lead out the lead wires 36 of the coils 18 and 17 of the brushless motors 1 and 10 to the outside.

  Further, the number of stators may be set to three or more, and the brushless motor may be configured so that one rotor is disposed on the outer periphery of two or more stators. FIG. 11 shows an example of such a brushless motor. In the brushless motor 1a of FIG. 11, the number of stators is set to three as indicated by reference numerals 15, 16, and 16, and one rotor 27 is disposed on the outer periphery of the two stators 16 and 16. It is composed. Magnet guides 31, 28, and 35 are attached to the inner periphery on the rotor 27 side, and two magnets 32 and 32 are fixed.

  As described above, the number of brushless motors 1 is increased as shown in FIG. 10 or the number of stators is increased as shown in FIG. The brushless motor can be rotated at a high speed.

It is a longitudinal cross-sectional view of the brushless motor which is one Embodiment of this invention. It is a disassembled perspective view of the brushless motor. It is the top view (a) and longitudinal cross-sectional view (b) of a guide plate. It is the top view (a) and longitudinal cross-sectional view (b) of a spindle case. It is the top view (a) and longitudinal cross-sectional view (b) of a stator. It is the top view (a) and radial direction side view (b) of a drive shaft. It is the top view (a) and longitudinal cross-sectional view (b) of a drive wheel. It is the longitudinal cross-sectional view (a) and top view (b) of a rotor back yoke. They are a magnet guide top view (a) and a side view (b). It is a longitudinal cross-sectional view of two brushless motors connected to one drive shaft. It is a longitudinal cross-sectional view of the brushless motor which has arrange | positioned one rotor on the outer periphery of two stators. 1 is a plan view (a) and a right sectional view (b) of the external appearance of the brushless motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Drive shaft 3, 4 Motor 11, 12 Guide plate 13, 14 Spindle case 15, 16 Stator 17, 18 Winding coil 19 Bearing 21 Drive wheel 25 Rotor back yoke 26, 27 Rotor 28, 31, 35 Magnet guide 29, 32 Magnet 33, 34 Bearing 36 Lead wire

Claims (4)

A drive shaft;
A plurality of stators disposed on the outer periphery of the drive shaft, a drive wheel having a central portion fixed to the outer periphery of the drive shaft and extending in the radial direction of the drive shaft;
A plurality of cylindrical shapes that are respectively fixed to the outer periphery of the drive wheel, extend from the drive wheel to both sides of the drive shaft in a concentric manner with the drive shaft, and are respectively disposed on the outer periphery of the stator. The rotor,
A plurality of bearings for supporting the plurality of rotors from both axial sides of the drive shaft;
A plurality of bearings for supporting the drive shaft from both axial sides of the drive shaft;
Equipped with a,
The length of the outer diameter of each rotor in the plurality of rotors is a brushless motor that is shorter than the axial length of a cylindrical body integrated by fixing the plurality of rotors to the outer periphery of the drive wheel . A drive shaft;
A plurality of stators disposed on the outer periphery of the drive shaft, a drive wheel having a central portion fixed to the outer periphery of the drive shaft and extending in the radial direction of the drive shaft;
A plurality of cylindrical shapes that are respectively fixed to the outer periphery of the drive wheel, extend from the drive wheel to both sides of the drive shaft in a concentric manner with the drive shaft, and are respectively disposed on the outer periphery of the stator. A rotor,
A plurality of bearings for supporting the plurality of rotors from both axial sides of the drive shaft;
A plurality of bearings for supporting the drive shaft from both axial sides of the drive shaft;
With
The length of the outer diameter of each rotor in the plurality of rotors is shorter than the axial length of the cylindrical body integrated by fixing the plurality of rotors to the outer peripheral portion of the drive wheel,
Furthermore, the number of stators is three or more, and one brush is disposed on the outer periphery of two or more stators. A drive shaft;
A plurality of stators disposed on the outer periphery of the drive shaft, a drive wheel having a central portion fixed to the outer periphery of the drive shaft and extending in the radial direction of the drive shaft;
A plurality of cylindrical shapes that are respectively fixed to the outer periphery of the drive wheel, extend from the drive wheel to both sides of the drive shaft in a concentric manner with the drive shaft, and are respectively disposed on the outer periphery of the stator. The rotor,
A plurality of bearings for supporting the plurality of rotors from both axial sides of the drive shaft;
A plurality of bearings for supporting the drive shaft from both axial sides of the drive shaft;
Equipped with a,
The length of the outer diameter of each rotor in the plurality of rotors is such that the plurality of brushless motors are shorter than the axial length of the cylindrical body integrated by fixing the plurality of rotors to the outer periphery of the drive wheel. While providing a stand,
A brushless motor in which each of the plurality of brushless motors has a common drive shaft among the plurality of brushless motors, and the drive shaft is driven by the plurality of brushless motors. The brushless according to any one of claims 1 to 3, wherein a stopper ring and a thrust nut are fixed on an outer periphery on one end side of the drive shaft, and a thrust ring is provided integrally with the drive shaft on the other side. motor.

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