JPH052568U - Outer rotor motor - Google Patents

Abstract

(57) [Abstract] [Purpose] The steps such as assembling and adjusting the outer rotor motor and the reduction mechanism can be simplified, the motor can be downsized, and the rotational force of the motor can be used as a power source. Another object of the present invention is to provide an outer rotor motor that can be transmitted to a reduction mechanism. [Structure] The shaft 1 is provided so as to project from the shaft 1 fixing portion on the end surface of the rotor cup 4 of the outer rotor motor to the outside. A gear 10 having the same center as that of the shaft 1 is provided integrally with the shaft 1 and the rotor cup 4 on the protruding portion of the shaft 1. A tooth profile is formed on the outer peripheral surface of the gear 10. A protruding gear 11 is provided on a part of the outer peripheral surface of the rotor cup 4. These gears 10, 11
Meshes with the gear of the reduction mechanism. That is, the steps of assembling and adjusting the motor and the reduction mechanism can be simplified, and the outer rotor motor that can be downsized can be provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an outer rotor motor.

[0002]

[Prior Art]

 Various outer rotor type motors have been known, but recently, for the purpose of simplifying the structure and reducing the manufacturing process, the outer rotor cup was made of synthetic resin, and a metal frame and magnet were integrally molded inside it. Have been proposed by the applicant.

FIG. 3 shows an example of a motor provided with such a resin-integrated rotor cup. That is, the shaft 1 is rotatably provided via the bearing 2 to the stator 3 having the stator coil 3a and the iron core 3b. In addition, around the stator 3, a rotor cup 4 having a cup shape with an end surface and a circumferential surface is provided at a constant interval so as to cover the stator 3. The rotor cup 4 is made by casting resin into a mold and integrally molding it with the back yoke 5 and the magnet 6. The central portion of the shaft 1 is fixed to the protruding portion of the shaft 1 from the stator 3 and is rotatable with the shaft 1.

On the other hand, a printed circuit board 7 is provided integrally with the stator 3 at the end of the stator 3 in the opening direction of the rotor cup 4. A sensor such as a photo interrupter 8 is attached to a part of the side edge of the printed board 7.

Such a motor includes a stator coil 3 a arranged on the stator 3 and a magnet 6 mounted via a back yoke 5 at a position corresponding to the stator coil 3 a on the inner peripheral surface of the rotor cup 4. Rotation of the rotor cup 4 is being performed. Further, the printed circuit board 7 switches the current to the stator coil 3a, and the rotation of the rotor cup 4 is controlled by a sensor such as a photo interrupter 8.

By the way, the rotational force of the outer rotor motor is transmitted to the device as a power through a speed reduction mechanism (not shown) composed of a plurality of gears.

[0007]

[Problems to be solved by the device]

 However, as a means for transmitting such a rotational force of the outer rotor motor as power to the reduction mechanism, it is necessary to project the shaft 1 from the motor as an output shaft, and to provide a connecting portion with the reduction mechanism on the output shaft. is there. Gears and the like are provided in such a connecting portion, and power is transmitted by meshing with gears and the like of the reduction mechanism. That is, a means for smoothly transmitting the power obtained by the motor to a reduction gear mechanism is required as a separate member from the motor, and the steps such as assembling the outer rotor motor and the reduction gear mechanism and adjusting the connecting parts are important. , Becomes complicated. Furthermore, this makes it difficult to downsize the outer rotor motor.

The present invention has been provided in order to solve the above-described problems of the conventional technology, and an object thereof is to simplify the steps such as assembly and adjustment, and to reduce the size. It is also an object of the present invention to provide an outer rotor motor capable of achieving the above and further capable of smoothly transmitting the power obtained by the motor to the reduction mechanism.

[0009]

[Means for Solving the Problems]

 The outer rotor motor of the present invention comprises a stator and a rotor cup, which is formed into a cup shape with an end surface and a circumferential surface, and is provided so as to cover the stator. In the outer rotor motor, means for transmitting power of the outer rotor motor is provided. It is characterized in that it is provided integrally with the rotor cup.

[0010]

[Action]

 In the outer rotor motor of the present invention having the above-described structure, the power obtained by the motor can be directly transmitted to the reduction mechanism by the power transmission means provided integrally with the rotor cup. In other words, since it is not necessary to provide a means for transmitting power to the motor as a separate member, the size can be reduced, and the number of members can be reduced, so that the assembly and adjustment processes can be simplified. You can

[0011]

【Example】

 An embodiment of the outer rotor motor of the present invention will be described below with reference to FIG.

In this embodiment, the same members as those in the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

That is, in the rotor cup 4 provided in the outer rotor motor of this embodiment, the shaft 1 is provided so as to protrude from the end of the shaft 1 fixing portion of the rotor cup 4 to the outside. A gear 10 having a toothed outer peripheral surface is provided integrally with the shaft 1 and the rotor cup 4 at the protruding portion of the shaft 1. Further, a protruding gear 11 is integrally provided with the rotor cup on a part of the outer peripheral surface of the rotor cup 4.

By the way, a gear (not shown) of a speed reduction mechanism that meshes with the gear 10 and the protruding gear 11 is arranged near the rotor cup 4.

The operation of the outer rotor motor of the present embodiment configured as described above is as follows.

That is, when the rotor cup 4 is rotated, the gear 10 and the protruding gear 11 rotate together with the rotor cup 4. A gear (not shown) of the reduction mechanism meshes with the rotation of the gears 10 and 11, and the rotation of the motor is transmitted as power.

According to the outer rotor motor of the present embodiment as described above, the gears 10 and 11 for transmitting power to the reduction mechanism are directly provided on the rotor cup 4, so that the shaft 1 protruding from the rotor cup 4 And the rotor cup 4 will act as an output shaft. Therefore, it is not necessary to provide a means for transmitting power, such as a connecting portion between the output shaft and the reduction mechanism, as a separate member from the motor. That is, since the number of members can be reduced, the steps of assembling and adjusting the motor and the reduction mechanism can be simplified. This makes it easy to automate these processes, and also enables downsizing of the motor.

Furthermore, since the gears 10 and 11 provided on the rotor cup 4 and the gears of the speed reduction mechanism directly mesh with each other, the rotational force of the motor is smoothly transmitted as power.

On the other hand, since the diameters of the gears 10 and 11 can be made sufficiently larger than those of the conventional gears provided on the shaft 1, the work rate can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, and the specific shape of each member, the mounting position and method of each member, and the like can be changed as appropriate.

For example, the number of gears provided on the rotor cup 4 is not limited to two, and either one can sufficiently transmit power. Further, it can be provided at a plurality of places as necessary, and power can be efficiently transmitted by using necessary gears depending on the situation.

Further, by forming the mold of the rotor cup 4 into a shape provided with gears, it is possible to provide an outer rotor motor in which gears for power transmission are integrally formed in the rotor cup. As a result, it is possible to provide an outer rotor motor that can reduce the number of members and the manufacturing process.

By the way, in the outer rotor motor integrally formed with such a gear for power transmission, it is not necessary to provide the motor with the shaft 1 for connecting to the reduction mechanism. Therefore, an outer rotor motor without a shaft as shown in FIG. 3 can be formed. That is, the rotor cup 14 integrally formed with the gear portion 20 for transmitting power is provided directly on the stator 13 via the bearing 12. In such an outer rotor motor, since there is no shaft inside the stator 13, the size of the stator coil 13a and the iron core 13b can be made larger than in the conventional case. Therefore, the magnetic path area can be increased, and a highly efficient motor can be obtained. Further, in this case, since the bearing 12 can be provided at one place for directly mounting the rotor cup 14 on the stator 13, the number of members can be reduced and the assembling process can be simplified.

In such an outer rotor motor without a shaft, the motor mounting hole 21 is formed in the end portion of the stator 13 so that the motor can be fixed to the fixing member by a tapping screw or the like. That is, the motor can be easily mounted without using a separate member as the mounting member.

On the other hand, the photo interrupter that controls the rotation of the rotor cup 4 can be used as another sensor. That is, as shown in FIG. 3 (A), the frequency oscillator 17 provided on the printed circuit board 7 and, as shown in FIG. 3 (B), the frequency oscillator 17 extended to the end of the rotor cup 14 is provided in the axial direction. It is also possible to control the rotation of the rotor cup 14 as a field magnetic pole position detection sensor by means of the magnet 16 that becomes a pole. In this case, it is not necessary to provide a portion corresponding to the photointerrupter on the rotor cup 14, so that the rotor cup 14 has a simple shape. As a result, the mold making process for the rotor cup 14 can be simplified. Furthermore, when molding the rotor cup 14 with a mold, adjustments such as balancing the weight become easy.

By the way, the means for transmitting power is not limited to gears, and power may be transmitted using a pulley, a planetary gear, or the like.

[0027]

[Effect of the device]

 According to the outer rotor motor of the present invention, the rotation of the rotor cup is directly transmitted to the reduction gear mechanism by providing the rotor cup with an output shaft for driving the reduction gear mechanism. That is, the steps of assembling and adjusting can be simplified and automated, the motor can be downsized, and the power can be transmitted smoothly.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of an outer rotor motor of the present invention.

FIG. 2 is a side sectional view showing another embodiment of the present invention.

FIG. 3 is a side sectional view showing a conventional rotor cup.

[Explanation of reference numerals] 1 shaft 2,12 bearing 3,13 stator 4,14 rotor cup 5 back yoke 6,16 magnet 7 printed circuit board 8 photointerrupter 10 gear 11 protruding gear 17 frequency oscillator 20 gear section 21 motor mounting hole

Claims (1)

Claims for utility model registration: 1. An outer rotor motor comprising: a stator; and a rotor cup which is formed into a cup shape by an end surface and a circumferential surface and is provided so as to cover the stator. An outer rotor motor, wherein the means for transmitting is provided integrally with the rotor cup.