JP3989462B2 - Outer rotor type permanent magnet motor - Google Patents

Description

  The present invention relates to an outer rotor type permanent magnet electric motor, and in particular, a plurality of permanent magnets are equally spaced by a circular frame for positioning so as to ensure accuracy of spacing between permanent magnets and accuracy of adhesion positioning. And an outer rotor type permanent magnet electric motor which can be fixed on the inner wall of the brake drum of the rotor portion.

  In general, the rotational power of an electric motor converts electrical energy into rotational mechanical energy by the interaction of a magnetic field generated by a current flowing between a rotor and a stator. Since the development of new high-magnetism permanent magnet materials continues, the volume and mass of permanent magnets are smaller and the magnetic properties are stronger, so permanent magnet type made with such high-magnetism magnets When the electric motor and the conventional coiling motor are compared with the same torque, the volume and weight of the permanent magnet motor are relatively greatly reduced.

  All conventional elevators require a tractor to be installed in the machine room, and the building can be a machine regardless of whether the machine room is an upper ceiling type or a lower bottom type. The construction cost of the room is high, and not only is the floor space occupied, but the design of the building is subject to considerable restrictions. Currently, the outer rotor type permanent magnet motor is already applied to the elevator system, mainly using its flat and thin characteristics, and the drive traction machine and elevator control panel etc. other than the elevator box and load lifting path By installing it on the wall of the hoistway, the purpose of eliminating the machine room can be achieved.

  As shown in FIG. 12, a conventional drive traction machine for an elevator basically has a housing chamber formed therein, a base having a bearing jacket disposed at the center thereof, a large number of magnetic poles, and on the magnetic poles. The motor has a stator portion that is housed and fixed in a storage chamber, and has a brake drum 101 to which a large number of permanent magnet units 102 are attached. And a rotor portion 100 of an electric motor that can be rotated by a central shaft 103 that passes through a bearing jacket of the base body. In these conventional techniques, a large number of small permanent magnet units 102 are bonded one by one on the inner circular wall 101a of the brake drum 101 with an adhesive, so that accurate positioning is not easy. The attachment strength is also unreliable, and there is always a problem that the centrifugal force during operation of the electric motor is not uniform, so that it is easy to drop off. (See Patent Document 1)

Japanese Patent Laid-Open No. 08-191555 (paragraphs [0030] to [0032], FIGS. 1 and 3 to 5)

  The main object of the present invention is to fix a large number of permanent magnet units inside a brake drum by a positioning frame, so that the inaccurate positioning of the permanent magnets and the strength against centrifugal force during operation of the motor are insufficient. It is an object of the present invention to provide an abduction rotor type permanent magnet electric motor that has improved the above problems.

In order to achieve the above object and other objects, the present invention has the following main parts:
A base having a bottom portion on one side and an open side on the other side, a hollow bearing mantle extending in the center and extending inward;
A stator portion including a large number of magnetic poles and a coil provided on the magnetic pole, housed and fixed in the housing chamber, housed in the housing chamber, one end portion opened, and the other side The end portion has a hollow brake drum with an attachment portion for fixing a driving wheel protruding outside the storage chamber at the outer edge, and a large number of permanent magnet units surrounding the outside of the stator portion. A rotor portion having a short shaft fixed to each other along the inside of the circumferential wall of the brake drum at equal intervals and having one side rotatably fitted in a hollow bearing jacket inside the brake drum; Is provided.

  According to the present invention, the positioning circular frame is fixed to the inside of the brake drum, the positioning circular frame is composed of the inner ring-shaped push plate and the outer ring-shaped push plate, and both the ring-shaped push plates are A large number of storage spaces are formed at a predetermined pitch along a peripheral edge between the two, and a large number of permanent magnet units are respectively fitted in the storage spaces. In this way, the permanent magnet unit is accurately positioned and easy to install, and the strength against centrifugal force during operation of the electric motor is increased, so that it is durable.

  According to the present invention, the outer frame of the base body has two long-axis side portions and two short-axis side portions, and a pair of half-side frames surrounded by the outside of the rotor portion. A cylindrical reinforcing rib, and two pairs of long reinforcing ribs interposed between both ends of the semicylindrical reinforcing rib and the side portions in the short direction. Since it is formed in a rectangular reinforcement structure, it can accept stress from each direction, and all four sides of the outer frame can be used as mounting surfaces, so it can be applied to various mounting cases, for example, When applied to elevator elevators, it can be adapted to limited location restrictions and can be secured on the wall of the elevator path with the most appropriate mounting surface. This is another effect of the present invention.

  According to the present invention, the brakes provided outside the brake drum are fixed to the upper and lower portions of the base body, that is, the opposite sides in the minor axis direction, and these brakes are respectively controlled to abut on the brake drum. One brake piece capable of braking the rotor portion is provided. This brake adopts the structure of the upper and lower opposing side arrangement, effectively reducing the width of the motor and improving the degree of freedom of mounting the base, as well as increasing the outer diameter of the brake drum as much as possible to improve the braking efficiency. Since this brake piece is provided on the outside of the brake drum, the heat due to friction is directly radiated to the outside, so that the heat does not accumulate inside and does not adversely affect the magnetic characteristics of the permanent magnet, According to this structure, attachment and adjustment are easy to implement. This is another effect of the present invention.

  Hereinafter, the technical features of the present invention will be described in more detail with reference to examples. In addition, this Example is only a preferable illustration, Comprising: It does not intend to limit the scope of the present invention to this. Those skilled in the art will understand the present invention in more detail with reference to the following detailed description in conjunction with the reference drawings.

  First, referring to FIGS. 1 to 4, an outer rotor type permanent magnet type electric motor 1 of the present invention has a base 10, which has two long side portions 11 and two short axes. The base 10 is provided with a bottom 13 on one side and is open on the other side, and a pair of semi-cylinders provided in the major axis direction inside the base 10. Storage chamber 15 surrounded by the reinforcing ribs 14 and two pairs of long-axis directions integrally provided between both ends of the semicylindrical reinforcing ribs 14 and the side portions 12 in the short-axis direction. , A bearing mantle 17 is provided in the center of the base body 10 from the bottom 13 toward the storage chamber 15, and a plurality of bearings 171 are provided in the central shaft hole.

  The stator portion 20 is housed in the housing chamber 15, has a large number of magnetic poles composed of a large number of silicon steel plates 21, and is fixed by passing a large number of bolts 23 through the bottom of the base body 10. Each of the magnetic poles is provided with a number of exciting coils 22.

  The rotor portion 30 has a hollow brake drum 31, and the hollow brake drum 31 is accommodated in the storage chamber 15 with one end portion open, and the other end portion outside the storage chamber 15. And a mounting portion 32 to which the driving wheel 36 is fixed. A positioning circular frame 33 is fixed on the inner side of the brake drum 31 along the inner side of the circumferential wall. Further, on the positioning circular frame 33, the outer side of the stator portion 20 is surrounded to generate a magnetic rotation moment. A large number of permanent magnet units 330 are attached to the other side of the brake drum 31, and a short shaft 35 fixed to the center of the brake drum 31 by a large number of bolts 34 is provided on the other side of the brake drum 31, and the short shaft 35 is a hollow bearing. It is inserted into a bearing 171 in the outer jacket 17 and is rotatable.

  The pair of brakes 40 are provided on the upper and lower portions of the base body 10, that is, on the side portions 12 facing each other in the short axis direction, and the inner ends are symmetrical to the outside of the brake drum 31. These brakes 40 are each provided with a brake piece 42 that can be controlled to abut on the brake drum 31 and brake the rotor 30. The decoder 51 is provided at the outer diameter portion of the short shaft 35 at the inner end with respect to the bearing mantle 17, and positioning of the rotation start position of the short shaft 35 and the rotation angle position of the short shaft 35 during the decoding period. It is for performing such as setting.

  5 to 7, according to the present invention, a large number of permanent magnet units 330 are fixed to the inside of the brake drum 31 by the positioning circular frame 33, and on the inside of the circumferential wall of the brake drum 31. A first attachment portion 311 is formed, and a second attachment portion 312 is formed on the outer surface thereof. The positioning circular frame 33 includes an inner ring-shaped push plate 331 and an outer ring-shaped push plate 332, and the inner sides of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 have uniform inner diameters. An enlarged outer diameter portion 332 ′ is formed outside the outer ring-shaped push plate 332, and a large number of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 are arranged at equal pitches on the circumferential surface. A fitting hole 334 is provided.

  A large number of parallel distance limiting pins 333 are fitted into the fitting holes 334 of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332, respectively, so that the ring-shaped push plates 331 and 332 have a predetermined width. In addition, they are arranged at a predetermined pitch along the peripheral edge between the ring-shaped push plates 331 and 332 to form a large number of storage spaces 335 (see FIG. 6). In addition, a large number of bolt holes 336 are provided in the circumferential surface of the inner ring-shaped push plate 331, and the inner ring-shaped push plate 331 is formed on the inner side of the circumferential wall of the brake drum 31 by a large number of bolts (not shown). A plurality of bolt holes 336 are provided in the outer diameter portion 332 ′ of the outer ring-shaped push plate 332 while being fixed to the first attachment portion 311.

  In addition, a pair of butting holes 337 are provided on the circumferential surfaces of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 corresponding to each storage space 335, and furthermore, at both ends of the permanent magnet unit 330. A pair of projecting pins 3301 are formed so as to correspond to these butting holes 337, respectively, and after applying an adhesive to the affixing surfaces 330 a on the outside of these many permanent magnet units 330, The projecting pins 3301 at both ends are fitted into the butting holes 337 of the ring-shaped push plates 331 and 332, and a large number of bolts (not shown) are attached to the outer diameter portion 332 ′ of the outer ring-shaped push plate 332. The outer ring-shaped pressing plate 332 is inserted into the bolt hole 336 and the second outer surface of the brake drum 31 is removed as shown in FIG. It fixes to the attaching part 312. FIG. In this way, the permanent magnet unit 330 is accurately positioned and easy to install, and the strength against centrifugal force during operation of the electric motor is improved and the permanent magnet unit 330 is strong.

  Here, another embodiment will be described. FIGS. 8 to 11 show a second embodiment in which a large number of permanent magnet units 330 according to the present invention are fixed to a positioning circular frame 33 inside the brake drum 31. Since the outer rotor type permanent magnet type electric motor 1 according to the embodiment basically has the same configuration as the above-described example, detailed description thereof is omitted.

  As shown in FIGS. 8 to 11, in the present embodiment, more specifically, the positioning circular frame 33 includes an inner ring-shaped push plate 331 and an outer ring-shaped push plate 332, and this inner ring-shaped push plate. The inside of the plate 331 and the outer ring-shaped push plate 332 has a uniform inner diameter, and an enlarged outer diameter portion 332 ′ is formed outside the outer ring-like push plate 332.

  On the other hand, the brake drum 31 is formed with a first attachment portion 311 for positioning the inner ring-shaped push plate 331 on the inner side of the circumferential wall, and the first attachment portion 311 is provided on the circumferential surface thereof. A plurality of positioning holes 3110 are formed along the plurality of positioning protrusion pins 3310 formed by pushing and bending the base material of the inner ring-shaped push plate 331 and fitted into the positioning holes 3110. Further, a second mounting portion 312 for positioning the outer ring-shaped push plate 332 is formed on the outer surface of the brake drum 31, and a plurality of positioning holes are formed in the second mounting portion 312 along the circumferential surface. 3120, and a plurality of corresponding positionings formed by pushing and bending the base material of the outer diameter portion 332 ′ of the outer ring-shaped push plate 332 The projecting pins 3320 are fitted into the positioning holes 3120.

  Among them, as shown in FIGS. 11 (b) and 11 (c), the inner ring-shaped pressing plate 331 and the outer ring-shaped pressing plate 332 are arranged on the inner side in the diametrical direction. V-shaped projecting pins 338 are formed by pushing and bending the base material, and further, the position restraining pins 339 are formed by pushing and bending the base material outward in the diameter direction of the V-shaped projecting pins 338. Accordingly, a large number of storage spaces 335 are formed between the ring-shaped push plates 331 and 332 along the peripheral edge thereof, and a large number of permanent magnet units 330 are fitted in the storage spaces 335. Further, as shown in FIG. 9, the outer ring-shaped push plate 332 is provided with a large number of bolt holes 336 along the outer diameter portion 332 ′, and the outer ring is formed by a large number of bolts (not shown). The pressing plate 332 is fixed to the second mounting portion 312, and the permanent magnet units 330 are attached to the inside of the circumferential wall of the brake drum 31 one by one. If it does in this way, permanent magnet unit 330 will be positioned correctly, it will become easy to install, and the intensity to the centrifugal force at the time of operation of an electric motor will improve, and it will become strong.

  According to the present invention, the outer rotor-type permanent magnet electric motor 1 includes an outer frame of the base body 10 including two major side portions 11 and two minor side portions 12, A pair of semi-cylindrical reinforcing ribs 14 surrounded by the outside of the rotor portion 30 and two pairs of reinforcing ribs along the long axis direction provided integrally between the side portions 12 in the short axis direction 16, and the circular portion formed inside is reinforced with an outward rectangular structure, so that stress from each direction can be received, and the four side portions 11 of the outer frame can be received. Since all 12 can be used as mounting surfaces, it can be applied to various mountings. For example, when adapting to elevator elevators, it can accommodate limited location restrictions and can be secured on the wall of the elevator path with the most appropriate mounting surface.

  Further, according to the present invention, the brakes 40 provided on the outer sides of the brake drum 31 are fixed to the upper and lower portions of the base body 10, that is, the side portions facing each other in the minor axis direction, and these brakes 40 are arranged in the upper and lower opposing directions. By adopting this structure, the width of the base body 10 is effectively reduced, the degree of freedom in mounting the base body 10 is improved, and the outer diameter of the brake drum 31 is increased to increase the braking efficiency. Since 40 is provided outside the brake drum 31, when the electric motor is operated, the frictional heat generated by the brake piece 42 is directly radiated to the outside, so that heat does not accumulate inside and the magnetic characteristics of the permanent magnet are not adversely affected. Furthermore, according to this structure, attachment and adjustment are easy to implement.

  The embodiments disclosed herein are preferred examples in all respects and are not considered to be restrictive. That is, the scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  As described above, the outer rotor type permanent magnet type electric motor of the present invention can be accurately positioned and installed by fixing a large number of permanent magnet units inside the brake drum using a positioning frame. The strength against centrifugal force during operation of the electric motor is improved and it is strong. In addition, since the outside of the circular portion is formed in a rectangular reinforcement structure in the base, stress from each direction is applied. It can be accepted, and all four sides 11 and 12 of the outer frame can be used as mounting surfaces, so it can be applied to various mounting cases, etc., and has novelty, inventive step and industrial applicability. It is clear that this is an invention.

1 is an exploded perspective view of an embodiment of an outer rotor type permanent magnet motor according to the present invention. FIG. It is a perspective view of the combined state of the Example of the outer rotor type | mold permanent magnet type motor which concerns on this invention. FIG. 3 is a front view of the outer rotor type permanent magnet motor of FIG. 2. FIG. 4 is a cross-sectional view in the 4-4 direction of FIG. 3. It is a perspective view of the decomposition | disassembly state of the Example of the positioning circular frame which concerns on this invention. 6A is a perspective view of the assembled state of the positioning circular frame of FIG. 5, FIG. 6B is a partially enlarged view of a portion 6a of FIG. 6A, and FIG. It is the elements on larger scale of the code | symbol 6b part of 6 (a). It is a section perspective view in the state where a permanent magnet is attached to the inner side of a brake drum with the positioning circular frame concerning the present invention. It is sectional drawing which shows the state with which the 2nd Example of the positioning circular frame which concerns on this invention is attached to an outer rotor-type permanent magnet type electric motor. FIG. 9 (a) is a cross-sectional perspective view showing a state in which the second embodiment of the positioning circular frame according to the present invention is attached to the inside of the brake drum, and FIG. 9 (b) is a reference numeral 9a of FIG. 9 (a). It is the elements on larger scale of a part. It is a perspective view of the decomposition | disassembly state of the 2nd Example of the positioning circular frame which concerns on this invention. FIG. 11A is a perspective view of the assembled state of the positioning circular frame of FIG. 10, FIG. 11B is a partially enlarged view of a portion 11a of FIG. 11A, and FIG. 11C is FIG. It is the elements on larger scale of the code | symbol 11b part of (b). It is sectional drawing which shows the state which affixes a permanent magnet to the inner side of a brake drum with the conventional adhesive agent.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... External rotation rotor type permanent magnet type electric motor 10 of this invention 10 ... Base | substrate 11 ... Side part of a major axis direction 12 ... Side part of a minor axis direction 13 ... Bottom part 14 ... -Semi-cylindrical reinforcing rib 15 ... storage chamber 16 ... reinforcing rib 17 ... bearing jacket 171 ... bearing 20 ... stator part 21 ... silicon steel plate 22 ... coil 23, 34 41 ... Bolt 30 ... Rotor 31 ... Brake drum 32 ... Mounting part 330 ... Permanent magnet unit 35 ... Short shaft 36 ... Drive wheel 40 ... Brake 42 ..Brake piece 51 ... Decoder

Claims (14)

A storage chamber 15 having a bottom portion 13 on one side and an open side on the other side is formed, and a base 10 having a hollow bearing jacket 17 extending in the center and extending inside thereof,
A stator portion 20 having a number of magnetic poles and a coil 22 provided on the magnetic poles, and being housed and fixed in the housing chamber 15;
It is stored in the storage chamber 15, one end is open, and the other end is an attachment portion 32 for fixing the driving wheel 36 protruding outside the storage chamber 15 to the outer edge. A plurality of permanent magnet units 330 surrounding the outside of the stator portion 20 are attached at equal intervals along the inside of the circumferential wall of the brake drum 31, A rotor 30 having a short shaft 35 fixed to one side of the brake drum 31 so as to be rotatable in the hollow drum 17;
In the outer rotor type permanent magnet electric motor 1 comprising:
A positioning circular frame 33 is fixed inside the brake drum 31, and the positioning circular frame 33 has an inner ring-shaped push plate 331 and an outer ring-shaped push plate 332, and has a large number of parallel distance limiting pins. The ring-shaped push plates are separated by a predetermined width by 333, and a plurality of storage spaces 335 are formed at a predetermined pitch along a peripheral edge between the ring-like push plates 331 and 332, and the many Each of the permanent magnet units 330 is fitted into the storage space 335, and the outer rotor-type permanent magnet electric motor.   A first attachment portion 311 for fixing the inner ring-shaped push plate 331 is formed on the inner surface of the circumferential wall of the brake drum 31, and a second attachment for fixing the outer ring-like push plate 332. The outer rotor type permanent magnet electric motor according to claim 1, wherein the portion 312 is formed on an outer surface of the brake drum 31.   The pair of butting holes 337 corresponding to each storage space 335 are provided on the inner peripheral surfaces of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 according to claim 1. Outer rotor type permanent magnet motor.   The abduction of claim 3, wherein a pair of projecting pins 3301 are formed so that both ends of the permanent magnet unit 330 correspond to the butting holes 337 on the ring-shaped push plates 331 and 332, respectively. Rotor type permanent magnet motor.   One fitting hole 334 is provided on the inner peripheral surface of each of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 so as to correspond to each of the interval limiting pins 333. Item 10. An outer rotor-type permanent magnet electric motor according to item 1.   The insides of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 have uniform inner diameters, and an enlarged outer diameter portion 332 ′ is formed outside the outer ring-shaped push plate 332. A large number of bolt holes 336 are provided on the circumferential surface of the inner ring-shaped push plate 331 and the outer diameter portion 332 ′ of the outer ring-shaped push plate 332, respectively, and the inner ring-shaped push plate 331 is connected to the first ring by a large number of bolts. The outer rotor-type permanent magnet motor according to claim 2, wherein the outer ring-shaped push plate 332 is fixed to the second mounting portion 312. A storage chamber 15 having a bottom portion 13 on one side and an open side on the other side is formed, and a base 10 having a hollow bearing jacket 17 extending in the center and extending inside thereof,
A stator portion 20 having a number of magnetic poles and a coil 22 provided on the magnetic poles, and being housed and fixed in the housing chamber 15;
It is stored in the storage chamber 15, one end is open, and the other end is an attachment portion 32 for fixing the driving wheel 36 protruding outside the storage chamber 15 to the outer edge. A plurality of permanent magnet units 330 surrounding the outside of the stator portion 20 are attached at equal intervals along the inside of the circumferential wall of the brake drum 31, A rotor 30 having a short shaft 35 fixed to one side of the brake drum 31 so as to be rotatable in the hollow drum 17;
In the outer rotor type permanent magnet electric motor 1 comprising:
A positioning circular frame 33 is fixed inside the brake drum 31, and the positioning circular frame 33 includes an inner ring-shaped push plate 331 and an outer ring-shaped push plate 332, and both the ring-shaped push plates 331. A large number of V-shaped projecting pins 338 are formed by pushing and bending the base material in a direction facing the inner side of the 332 at a predetermined pitch, and between the ring-shaped pressing plates 331 and 332, The position-limiting pins 339 are formed by pushing and bending the base material on the outer side in the diameter direction of the V-shaped projecting pins 338 so that a large number of storage spaces 335 are formed along each of the plurality of permanent magnet units. An outer rotor type permanent magnet electric motor characterized in that 330 is fitted in the storage space 335 thereof.   A first mounting portion 311 for fixing the inner ring-shaped pressing plate 331 is formed on the inner side of the circumferential wall of the brake drum 31, and a second mounting for fixing the outer ring-shaped pressing plate 332. The outer rotor-type permanent magnet electric motor according to claim 7, wherein the portion 312 is formed on an outer surface of the brake drum 31.   The insides of the inner ring-shaped push plate 331 and the outer ring-shaped push plate 332 have uniform inner diameters, and an enlarged outer diameter portion 332 ′ is formed outside the outer ring-shaped push plate 332. The outer rotor type permanent magnet type electric motor according to claim 8.   A plurality of positioning holes 3110 are formed along the circumferential surface of the first mounting portion 311, and a plurality of corresponding positioning protrusions formed by pressing and bending the base material to the inner ring-shaped pressing plate 331. Pins 3310 are fitted into these positioning holes 3110, and a plurality of positioning holes 3120 are formed along the circumferential surface of the second mounting portion 312, and the outer diameter portion of the outer ring-shaped push plate 332 is formed. 9. The outer rotor type according to claim 8, wherein a plurality of positioning protrusion pins 3320 corresponding to each other formed by pushing and bending the base material to 332 'are fitted in the positioning holes 3120. Permanent magnet motor.   A large number of bolt holes 336 are provided along the outer diameter portion 332 ′ of the outer ring-shaped push plate 332, and the outer ring-shaped push plate 332 is fixed to the second mounting portion 312 with a large number of bolts. The outer rotor type permanent magnet type electric motor according to claim 10.   It has a pair of brakes 40 fixed to opposing sides of the upper and lower parts of the base body 10, and these brakes 40 are each provided with a brake piece 42 that can be controlled and abutted on the brake drum 31. An outer rotor type permanent magnet electric motor according to claim 1 or 7, characterized in that. A storage chamber 15 having a bottom portion 13 on one side and an open side on the other side is formed, and a base 10 having a hollow bearing jacket 17 extending in the center and extending inside thereof,
A stator portion 20 having a number of magnetic poles and a coil 22 provided on the magnetic poles, and being housed and fixed in the housing chamber 15;
It is stored in the storage chamber 15, one end is open, and the other end is an attachment portion 32 for fixing the driving wheel 36 protruding outside the storage chamber 15 to the outer edge. A plurality of permanent magnet units 330 surrounding the outside of the stator 20 are attached at equal intervals along the inside of the circumferential wall of the brake drum 31, A rotor portion 30 having a short shaft 35 fixed to the inside of the brake drum 31 so that the side is rotatably fitted in the brake drum 31;
In the outer rotor type permanent magnet electric motor 1 comprising:
A pair of semi-cylindrical reinforcements in which the outer frame of the base body 10 has two long side portions 11 and two short side portions 12 and surrounds the outside of the rotor portion 30 therein. An abduction rotor comprising ribs 14 and two pairs of reinforcing ribs 16 in the major axis direction interposed between both ends of the semicylindrical reinforcing ribs 14 and the side parts 12 in the minor axis direction. Type permanent magnet motor.   It has a pair of brakes 40 fixed to opposing sides of the upper and lower parts of the base body 10, and these brakes 40 are each provided with a brake piece 42 that can be controlled and abutted on the brake drum 31. The abduction rotor type permanent magnet electric motor according to claim 13.

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