TW201535934A - Permanent-magnet rotating machine - Google Patents

Abstract

The present invention provides a permanent-magnet rotating machine, comprising: a housing, which has a cylindrical frame, a load side bracket fixed to one end of the frame and an anti-load side bracket fixed to the other end of the frame, wherein an outer ring of a bearing is embedded in a circular cavity of the load side bracket; a stator, which is formed by stacking silicon steel plates and formed with a cylinder shape, provided with a plurality of teeth in an inner circumferential portion thereof with windings applied on the teeth, and embedded in the frame of the housing; a rotor, which has a thin-wall cylinder made of a structural steel, a circular plate with step portion and a shaft, wherein the thin-wall cylinder has a plurality of permanent magnents fixed on an outer circumferential portion thereof with uniform intervals, the circular plate with step portion is connected to one end of the thin-wall cylinder, the shaft is fixed to the center of the circular plate with step oprtion and the step portion of the circular plate with step portion is engaged with an inner ring of the bearing, so that the rotor is rotatably cantilever-supported by the load side bracket of the housing; and a back yoke, which is formed by stacking silicon steel plates and formed with a cylinder shape, inserted into the thin-wall cylinder of the rotor with a small air gap interposed therebetween and cantilever-supported by the anti-load side bracket of the housing.

Description

Permanent magnet type rotary motor

The present invention relates to a permanent magnet type rotating electrical machine in which permanent magnets are disposed on the outer circumferential surface of the rotor.

Conventionally, there has been disclosed a permanent magnet type rotating electric machine comprising: a rotor having a cylindrical shape including an outer peripheral surface and an inner peripheral surface; and a magnetic field magnet for supplying magnetic field flux; and an inner peripheral stator And the armature winding is wound from the inner peripheral surface side and the armature winding; and the outer peripheral side stator is opposed to the rotor from the outer peripheral surface side, and the armature winding is wound; the inner circumference a ratio of a pole pair number of the side stator to a pole number of the outer circumference side stator, and a magnitude of the magnetic field flux that is interlinked to the armature winding of the outer circumference side stator, and an armature that is interlinked to the inner circumference side stator The ratio of the magnitudes of the magnetic field fluxes of the windings is selected to be equal (for example, refer to Patent Document 1).

Further, a hollow actuator has been disclosed which is provided with a motor which is in the shape of a hollow shaft, a cylindrical frame, a stator and a cup. a rotor having a flange portion at an end portion on the counter load side, wherein the frame is detachably fixed to an end portion of the counter load side, and the stator is fixed to the frame The rotor is disposed on the inner side of the stator and has an opening on the load side; the speed reducer is a Wave Generator, a Flex Spline, and a Circular Spline combined with the aforementioned rotor. The position detector for angle detection is composed of a magnetic sensor and a magnet, and the magnetic sensor is disposed on the side of the hollow shaft, and the magnet is opposite to the magnetic sensor. Provided on the opening side of the rotor; a low speed bearing is disposed between the frame and the output side of the speed reducer; and an output flange is provided on the output side of the speed reducer to perform a low speed operation The rotor system can be supported by the high-speed bearing on the load side of the motor to be cantilevered; the wave generator combined with the rotor is rotatably supported by the outer race of the high-speed bearing provided on the output flange. The inner race of the low-speed bearing is to mount the output flange as a housing; the hollow portion passing through the center of the actuator is hollow And the configuration of the output flange, and the position detector is provided on the anti-load side of the motor (e.g., refer to Patent Document 2).

[Previous Technical Literature] [Patent Document]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-166798

Patent Document 2: Japanese Patent No. 4650719

According to the conventional technique described in the above Patent Document 1, The structure is such that a magnetic body having a considerable thickness is provided on the inner circumferential side of the rotor in order to secure the magnetic circuit to increase the torque output. Therefore, since the rotor weight (inertia) becomes large, and one of the output torques is used for the acceleration of the inertia, there is a problem that the acceleration/deceleration performance and the efficiency are inferior.

Further, according to the conventional technique described in Patent Document 2, since the brake portion and the motor portion are arranged in the axial direction, there is a problem that the total length of the motor is long.

The present invention has been developed in view of the above problems, and an object of the present invention is to provide a compact structure that can achieve both low inertia and high torque to improve acceleration performance without lengthening the entire length even when the brake is mounted. Permanent magnet type rotary motor.

In order to solve the above-described problems and achieve the object, a permanent magnet rotating electrical machine according to the present invention includes a casing having a cylindrical frame, a load side bracket fixed to one end of the frame, and a frame fixed to the frame. a counter-load side bracket at the other end, and a bearing outer ring is fitted to the circular recessed portion of the load side bracket; the stator is formed by laminating the steel sheet and forming a cylindrical shape, and a plurality of inner peripheral portions are provided a tooth having a wire wound on the tooth and fitted to the frame of the outer casing; the rotor having a thin-walled cylindrical portion made of a steel material for construction, a segmented disc portion and a shaft, the thin-walled cylindrical portion being attached A plurality of permanent magnets are fixedly mounted at equal intervals in the outer peripheral portion, and the auxiliary disc portion is connected to one end of the thin-walled cylindrical portion, the shaft is fixed to the center of the differential disc portion, and is seated in the bearing The ring is fitted with the step portion of the aforementioned differential disc portion, and the The rotor is rotatably supported by the load side bracket of the outer casing by a cantilever; and a back yoke is formed by laminating the steel plate and forming a columnar shape, and is inserted into the thin wall circle of the rotor through a small air gap (air-gap). The inside of the tubular portion is supported by the cantilever arm on the opposite load side bracket of the outer casing.

The permanent-magnet-type rotating electrical machine according to the present invention achieves the following effects: both low inertia and high torque are used to improve the acceleration performance, and the entire length is not lengthened even if the brake is mounted.

20‧‧‧ Stator

22‧‧‧ teeth

23‧‧‧ cogging

24‧‧‧ Winding

30‧‧‧Rotor

31‧‧‧Thin wall cylinder

32‧‧‧Department section

33‧‧‧Axis

34‧‧‧ permanent magnet

40‧‧‧ Shell

41‧‧‧Frame

42‧‧‧Load side bracket

43‧‧‧Reverse load side bracket

43a‧‧‧Support table

43b‧‧‧Bolts

44‧‧‧ bearing

50‧‧‧ Back yoke

52‧‧‧ Hall sensor

60‧‧‧ Back yoke

61‧‧‧Helical spring

62‧‧ ‧ field magnet

63‧‧‧Brake coil

64‧‧‧ armature

66‧‧‧Support rod (linear sliding mechanism)

67‧‧‧Axial hole

91, 92‧‧‧ permanent magnet type rotating electric machine

Fig. 1 is a transverse cross-sectional view showing a first embodiment of a permanent magnet type rotating electric machine according to the present invention.

Fig. 2 is a longitudinal sectional view showing a permanent magnet type rotating electric machine according to a first embodiment.

Fig. 3 is a longitudinal sectional view showing a second embodiment of the permanent magnet type rotating electric machine according to the present invention.

Fig. 4 is a longitudinal sectional view showing a phase of a permanent magnet type rotating electric machine according to a second embodiment, which is different from Fig. 3;

Hereinafter, an embodiment of a permanent magnet type rotating electrical machine according to the present invention will be described in detail based on the drawings. Further, the present invention is not limited to the embodiment.

Embodiment 1.

Fig. 1 is a view showing the configuration of a permanent magnet type rotating electric machine of the present invention. In the cross-sectional view of the first aspect, the second drawing shows a longitudinal sectional view of the permanent magnet type rotating electric machine according to the first embodiment. As shown in FIG. 1 and FIG. 2, the permanent-magnet-type rotating electrical machine 91 of the first embodiment includes a casing 40 having a cylindrical frame 41 and a load-side bracket 42 fixed to one end of the frame 41, And a counter load side bracket 43 fixed to the other end of the frame 41, and a race other than the bearing 44 is fitted to the circular recess of the center portion of the load side bracket 42. The bearing 44 is a cross roller bearing.

Further, the permanent magnet type rotating electric machine 91 includes a stator 20, and the stator 20 is formed in a cylindrical shape, and a plurality of teeth (12 in the permanent magnet type rotating electric machine 91 of the first embodiment) are provided in the inner peripheral portion. 22 and a slot 23, a winding 24 is applied to the tooth 22, and is fitted to the frame 41 of the outer casing 40.

Further, the permanent magnet type rotating electric machine 91 includes a rotor 30 having a thin cylindrical portion 31, a segmented disc portion 32, and a shaft 33. The thin cylindrical portion 31 is fixedly mounted at equal intervals on the outer peripheral portion. (eight in the permanent magnet type rotating electric machine 91 of the first embodiment), the permanent magnet 34 is connected to one end of the thin cylindrical portion 31, and the shaft 33 is fixed to the attached disc portion 32. At the center of the bearing 44, the stepped portion of the attached disc portion 32 is fitted to the race, and the rotor is rotatably supported by the load side bracket 42 of the outer casing 40. The front end of the tooth 22 of the stator 20 and the pole end portion of the permanent magnet 34 of the rotor 30 are opposed to each other with an air gap therebetween.

Further, the permanent magnet type rotating electric machine 91 includes a back yoke 50, and the back yoke 50 is formed in a cylindrical shape with a slight gap therebetween. The air gap is inserted into the thin-walled cylindrical portion 31 of the rotor 30, and can be fixed to the support table 43a of the counter-load side bracket 43 of the outer casing 40 by a plurality of bolts 43b, and cantilevered by the support base 43a. A Hall sensor 52 for detecting the rotational position of the rotor 30 is embedded in the back yoke 50.

The iron core of the stator 20 and the back yoke 50 are formed by laminating a plurality of steel sheets in order to reduce iron loss. The thin cylindrical portion 31, the attached disc portion 32, and the shaft 33 of the rotor 30 are formed of a steel material for construction in order to secure strength. The thickness of the thin cylindrical portion 32 is set to be 1/4 or less of the width of the permanent magnet 34 in the circumferential direction, and the magnetic flux generated from the permanent magnet 34 and the winding 24 is formed. Circulate to the back yoke 50.

As described above, the permanent magnet type rotating electric machine 91 of the first embodiment thins the core of the rotor 30 (the thin cylindrical portion 31), thereby improving the acceleration/deceleration performance of the rotor 30 and providing the magnetic flux to flow. The magnetic circuit to the back yoke, whereby the torque output can be increased. Further, the back yoke 50 is formed by laminating a steel sheet, whereby iron loss can be reduced and efficiency can be improved.

Embodiment 2.

Fig. 3 is a vertical cross-sectional view showing a second embodiment of the permanent magnet type rotating electric machine according to the second embodiment of the present invention, and Fig. 4 is a longitudinal cross-sectional view showing a phase of the permanent magnet type rotating electric machine according to the second embodiment. As shown in FIG. 3 and FIG. 4, the outer casing 40, the stator 20, and the rotor 30 of the permanent magnet type rotating electric machine 92 of the second embodiment are the same as those of the permanent magnet type rotating electric machine 91 of the first embodiment, and thus the detailed description thereof is omitted. Characterization The resulting back yoke 60 is explained.

After the second embodiment, the yoke 60 is formed into a columnar shape by a plurality of ruthenium steel sheets, and is inserted into the thin cylindrical portion 31 of the rotor 30 via a slight air gap, and can be connected to the coil spring 61 by a plurality of coil springs 61. The counter load side bracket 43 of the outer casing 40. As shown in Fig. 4, a plurality of axial holes 67 are provided on the counter load side of the back yoke 60, and the anti-load side bracket 43 is fixedly fitted with a slide fit to the axial hole 67. A plurality of support rods 66. A plurality of support bars 66 constitute a linear slide mechanism of the back yoke 60. The linear slide mechanism (the plurality of support rods 66) is cantileverly support the rear yoke 60 in such a manner as to be displaceable in the axial direction and not rotatable about the shaft.

The back yoke 60 is axially displaceable in the thin-walled cylindrical portion 31 by the expansion and contraction of the coil spring 61, and is normally pressed by the expansion force of the compressed coil spring 61 to The load side end face of the rotor 30. A Hall sensor 52 for detecting the rotational position of the rotor 30 is embedded in the back yoke 60.

A circular recess is formed on the counter load side of the back yoke 60, and a brake coil 63 wound in the field 62 is embedded in the recess. An armature 64 opposed to the brake coil 63 is attached to a central portion of the counter load side bracket 43.

When the brake is not released (when the brake coil 63 is not energized), the tension side of the coil spring 61 can be used to push the load side end surface of the back yoke 60 against the load side end surface of the rotor 30, and the rotor is frictional. 30 cannot be rotated. When the brake is released (when the brake coil 63 is energized), the system utilizes The magnetic attraction of the brake coil 63 causes the field magnet 62 to be attracted by the armature 64, and the back yoke 60 is displaced to the counter load side, and the rotor 30 is freely rotatable. When the field magnet 62 is formed by a dust core or the like, the magnetic flux caused by the permanent magnet 34 and the winding 24 is not affected, and the leakage magnetic flux which deteriorates the motor characteristics can be reduced.

As described above, in the permanent magnet type rotating electric machine 92 of the second embodiment, the field magnet 62 and the brake coil 63 constituting the electromagnetic brake are embedded in the back yoke 60, so that the total length of the permanent magnet type rotating electric machine 92 can be shortened.

Further, the permanent magnet type rotating electric machine 91 of the first embodiment and the permanent magnet type rotating electric machine 92 of the second embodiment can obtain electric power from the winding 24 as long as the shaft 33 is rotated by external force, and can be used as a generator. .

20‧‧‧ Stator

24‧‧‧ Winding

30‧‧‧Rotor

31‧‧‧Thin wall cylinder

32‧‧‧Department section

33‧‧‧Axis

34‧‧‧ permanent magnet

40‧‧‧ Shell

41‧‧‧Frame

42‧‧‧Load side bracket

43‧‧‧Reverse load side bracket

43a‧‧‧Support table

43b‧‧‧Bolts

44‧‧‧ bearing

50‧‧‧ Back yoke

52‧‧‧ Hall sensor

91‧‧‧Permanent magnet type rotary motor

Claims (4)

A permanent magnet type rotating electric machine includes: a casing having a cylindrical frame, a load side bracket fixed to one end of the frame, and a counter load side bracket fixed to the other end of the frame, and on the load side a circular recessed portion of the bracket is fitted with a bearing outer race; the stator is formed by laminating a steel plate and formed into a cylindrical shape, and a plurality of teeth are provided on the inner peripheral portion, and a winding is applied to the tooth and fitted to the foregoing a frame of the outer casing; the rotor has a thin-walled cylindrical portion made of a steel material for construction, a segmented disc portion, and a shaft, and the thin-walled cylindrical portion is fixedly mounted at a plurality of permanent magnets at equal intervals on the outer peripheral portion, and the differential disc portion is attached Attached to one end of the thin-walled cylindrical portion, the shaft is fixed to the center of the differential disc portion, and the inner ring of the bearing is fitted with the step portion of the attached disc portion, and the rotor is rotated Freely supported by the load side bracket of the outer casing by the cantilever; and the back yoke is formed by laminating the steel plate and formed into a cylindrical shape, inserted into the thin cylindrical portion of the rotor through a small air gap, and supported by the cantilever The housing of the counter-load-side bracket. The permanent magnet type rotating electric machine according to claim 1, further comprising: a linear sliding mechanism provided on the opposite load side bracket of the outer casing so as to be capable of being displaced toward the axial direction and not being rotatable about the shaft Supporting the aforementioned back yoke; a spring is disposed on the opposite load side bracket of the outer casing for pressing the rear yoke toward the load side bracket; the field magnet and the brake coil are embedded on the opposite load side of the rear yoke; and the armature, It is fixed to the opposite load side bracket of the aforementioned outer casing. The permanent magnet type rotating electric machine according to claim 2, wherein the field magnet is formed of a dust core. The permanent magnet type rotating electric machine described in the first aspect of the patent application is used as a generator.