JP2014017999A - Motor and hybrid structure for construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of achieving high strength and low output as well as series conversion by the output of the motor with ease and at low cost.SOLUTION: A length L2 of a magnet 362 in the axial direction is shorter than a length L1 of a rotor core 361 in the axial direction. A short magnet 362 can reduce a magnetic force, thereby reducing the torque of a shaft fixed on the rotor core 361.

Description

  The present invention relates to a motor and a hybrid structure for construction equipment.

  Conventionally, as a motor of a hybrid structure for construction equipment, there is one disclosed in JP 2008-290594 A (Patent Document 1).

  The motor includes a motor housing, a stator mounted in the motor housing, a rotor disposed on the radially inner side of the stator, and a shaft fixed to the rotor.

  Then, by connecting the output shaft of the engine and the rotary shaft of the pump to the shaft of the motor, the motor assists the power of the engine or generates power by receiving the power of the engine.

JP 2008-290594 A

  By the way, in the said conventional motor, when adjusting the output of this motor, it respond | corresponded by changing the magnitude | size of both a stator core and a rotor core.

  Here, the size of the flywheel housing of the engine connected to the motor housing is almost determined by the standard, and the size of the motor housing is determined according to the size, and thus the diameter of the stator core The magnitude of the direction is determined.

  Moreover, since it is necessary to ensure the torque of the shaft, the size of the rotor core in the radial direction cannot be extremely reduced.

  Therefore, in order to adjust the output of the motor, it is necessary to increase or decrease the axial lengths of the stator core and the rotor core.

  However, when the axial length of the stator core is smaller than a predetermined value, the strength of the stator core is insufficient. For this reason, a low output motor cannot be manufactured.

  Furthermore, it is not desirable in terms of cost to manufacture rotor cores and stator cores of various sizes for the purpose of making a series for each output of the motor.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor capable of manufacturing a strong, low-output motor and easily and inexpensively making a series for each output of the motor, and a construction machine having the motor It is to provide a hybrid structure.

In order to solve the above problems, the motor of the present invention is
A motor housing;
A stator mounted in the motor housing;
A rotor disposed radially inside the stator;
A shaft fixed to the rotor,
The rotor is
Rotor core,
A torque reduction magnet for reducing the torque of the shaft is attached to the rotor core.

  According to the motor of the present invention, since the rotor has the torque reducing magnet, the output of the motor can be reduced by the torque reducing magnet.

  Accordingly, in order to reduce the output of the motor, it is not necessary to reduce the axial length and the radial size of the rotor core and the stator core, and the rotor core and the stator core are made to have a certain size by using the torque reducing magnet. Therefore, it is possible to manufacture a strong, low-output motor.

  Further, when manufacturing motors with different outputs, the rotor core and the stator core can be made common by simply changing the torque reducing magnet, and the series for each motor output can be easily and inexpensively performed.

  In the motor of one embodiment, the length of the torque reduction magnet in the axial direction is shorter than the length of the rotor core in the axial direction.

  According to the motor of this embodiment, the axial length of the torque reducing magnet is shorter than the axial length of the rotor core. Thus, the axial dimension of the magnet with high cost can be reduced to reduce the cost.

In the motor of one embodiment,
The rotor core has a magnet insertion hole for inserting the torque reduction magnet,
The radial size of the torque reducing magnet is smaller than the radial size of the magnet insertion hole of the rotor core.

  According to the motor of this embodiment, the radial size of the torque reducing magnet is smaller than the radial size of the magnet insertion hole of the rotor core. In this way, it is possible to reduce the cost by reducing the size in the radial direction of the expensive magnet.

  In the motor of one embodiment, the torque reduction magnet is a ferrite magnet.

  According to the motor of this embodiment, the torque reducing magnet is a ferrite magnet. Thus, cost reduction can be achieved by using an inexpensive magnet.

  In one embodiment, the motor includes a non-magnetic positioning member that positions the torque reducing magnet with respect to the rotor core.

  According to the motor of this embodiment, the torque reducing magnet is positioned with respect to the rotor core by the positioning member. Thereby, even if the dimension of the torque reduction magnet is reduced, the torque reduction magnet can be positioned at a predetermined position of the rotor core.

  In the motor of one embodiment, the axial length of the rotor core and the axial length of the torque reducing magnet are shorter than the axial length of the stator core of the stator.

  According to the motor of this embodiment, the axial length of the rotor core and the axial length of the torque reducing magnet are shorter than the axial length of the stator core of the stator. Can be reduced.

  As a result, in order to reduce the output of the motor, it is not necessary to reduce the axial length or radial size of the stator core, the stator core can be secured at a constant size, and a strong, low-output motor can be obtained. Can be manufactured.

  Furthermore, when manufacturing motors with different outputs, the stator core can be shared, and the series for each motor output can be easily and inexpensively performed.

In the hybrid structure for construction equipment of one embodiment,
Engine,
A pump,
The motor disposed between the engine and the pump;
The shaft of the motor is connected between the output shaft of the engine and the rotary shaft of the pump,
The motor housing of the motor is connected to the flywheel housing of the engine.

  According to the hybrid structure for construction equipment of this embodiment, the motor housing is connected to the flywheel housing. The size of the flywheel housing is almost determined by the standard, and the size of the motor housing is determined according to the size, and consequently the size of the stator core in the radial direction is determined. Even in such a case, the output of the motor can be reduced by using the torque reducing magnet, and the size of the stator core does not have to be changed.

  According to the motor of the present invention and the hybrid structure for construction equipment, the rotor has a torque reducing magnet, so that a strong and low output motor can be manufactured, and a series for each output of the motor. Can be easily and inexpensively performed.

It is a simplified sectional view showing a hybrid structure for a motor and a construction machine according to a first embodiment of the present invention. It is an expanded sectional view of a motor. It is an expanded sectional view of the motor of a 2nd embodiment of the present invention. It is an expanded sectional view of the motor of a 3rd embodiment of the present invention. It is an expanded sectional view of the motor of a 4th embodiment of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a construction machine hybrid structure according to a first embodiment of the present invention. As shown in FIG. 1, this hybrid structure for construction equipment is incorporated in, for example, a vehicle for construction equipment, and is disposed between an engine 1, a pump 2, and the engine 1 and the pump 2. The motor 3 is provided.

  The engine 1 includes an engine body 10, a flywheel 12 connected to the output shaft 11 of the engine body 10, and an engine housing 13. The engine housing 13 includes a main body housing 130 that covers the engine main body 10 and a flywheel housing 131 that covers the flywheel 12.

  The pump 2 is, for example, a hydraulic pump, and includes a pump body 20 and a pump housing 23. The pump housing 23 includes a main body housing 230 that covers the pump main body 20 and a mounting plate 231 that is positioned on the rotary shaft 21 side of the pump main body 20.

  The motor 3 is used, for example, to assist the power to the pump 2 of the engine 1 or to generate power by receiving power to the pump 2 of the engine 1. The motor 3 includes a motor housing 33, a stator 35, a rotor 36, and a shaft 31.

  The motor housing 33 is disposed between the engine housing 13 and the pump housing 23 and is connected to the engine housing 13 and the pump housing 23. Specifically, the motor housing 33 is connected to the flywheel housing 131 and the mounting plate 231 by bolts.

  The stator 35 is mounted in the motor housing 33. The stator 35 has a cylindrical stator core 351 that contacts the inner surface of the motor housing 33, and a stator coil 352 wound around the stator core 351.

  The rotor 36 is disposed on the radially inner side of the stator 35. The rotor 36 includes a cylindrical rotor core 361 that is arranged on the radially inner side of the stator core 351 with a space therebetween, and a plurality of magnets 362 embedded in the rotor core 361.

  The shaft 31 has a cylindrical shape, is fixed to the inner surface of the rotor 36, and is connected between the output shaft 11 of the engine 1 and the rotary shaft 21 of the pump 2. Specifically, one end of the shaft 31 is connected to the flywheel 12 by a bolt. The other end of the shaft 31 is connected to the rotating shaft 21 of the pump body 20 via a coupling 37. The coupling 37 is connected to the other end of the shaft 31 by a bolt.

  The operation of the hybrid structure for construction machinery will be described. When the output shaft 11 of the engine 1 rotates, the shaft 31 of the motor 3 rotates and the rotating shaft 21 of the pump 2 rotates. At this time, the motor 3 assists the power of the engine 1 by the electromagnetic force of the stator 35 and the rotor 36 or generates power by receiving the power of the engine 1.

  As shown in FIG. 2, the rotor core 361 has a plurality of magnet insertion holes 361a. The magnet insertion hole 361a is formed in a rectangular shape when viewed from the axial direction. The plurality of magnet insertion holes 361a are arranged at predetermined intervals in the circumferential direction.

  The magnet 362 is inserted into each of the plurality of magnet insertion holes 361a. The magnet 362 is a neodymium magnet and is formed in a plate shape.

  A length L2 of the magnet 362 in the axial direction is shorter than a length L1 of the rotor core 361 in the axial direction. By carrying out like this, in this shortened magnet 362, magnetic force can be reduced compared with the general magnet which has the same length as the length L1 of the rotor core 361. That is, the shortened magnet 362 can be said to be a torque reducing magnet for reducing the torque of the shaft 31. The axial length L1 of the rotor core 361 is substantially the same as the axial length of the stator core 351.

  On the other hand, the size (thickness) of the magnet 362 in the radial direction is the same as the size of the magnet insertion hole 361a in the radial direction.

  The magnet 362 is located in the central portion of the rotor core 361 in the axial direction. A nonmagnetic material 363 is provided in the magnet insertion hole 361a on both axial ends of the magnet 362. The nonmagnetic material 363 positions the magnet 362 with respect to the rotor core 361. That is, the nonmagnetic material 363 is an example of a positioning member.

  The nonmagnetic material 363 is made of, for example, resin or SUS. The non-magnetic material 363 may be inserted alone into the magnet insertion hole 361a, or may be formed integrally with an end plate (not shown) of the rotor core 361, and follow the attachment of this end plate to enter the magnet insertion hole 361a. It may be inserted.

  According to the motor 3 having the above-described configuration, the rotor 36 includes the torque reducing magnet 362, so that the output of the motor 3 can be reduced by the torque reducing magnet 362.

  Thus, in order to reduce the output of the motor 3, it is not necessary to reduce the axial length and the radial size of the rotor core 361 and the stator core 351. By using the torque reducing magnet 362, the rotor core 361 and The stator core 351 can be secured to a certain size, and the strong and low output motor 3 can be manufactured.

  Furthermore, when a plurality of torque reducing magnets 362 having different lengths in the axial direction are prepared and the motor 3 having a different output is manufactured, the rotor cores 361 and 361 are simply changed by changing the torque reducing magnets 362 having different lengths. The stator core 351 can be shared, and the series for each output of the motor 3 can be easily and inexpensively performed.

  The axial length L2 of the torque reducing magnet 362 is shorter than the axial length L1 of the rotor core 361. As described above, it is possible to reduce the cost by reducing the axial dimension of the expensive magnet 362.

  Further, the torque reducing magnet 362 is positioned with respect to the rotor core 361 by a non-magnetic material 363 as a positioning member. Thereby, even if the dimension of the torque reduction magnet 362 is reduced, the torque reduction magnet 362 can be positioned at a predetermined position of the rotor core 361.

  According to the hybrid structure for construction equipment having the above configuration, the motor housing 33 is connected to the flywheel housing 131. The size of the flywheel housing 131 is almost determined by the standard, and the size of the motor housing 33 is determined according to the size, and the size of the stator core 351 in the radial direction is determined accordingly. Even in such a case, by using the torque reducing magnet 362, the output of the motor 3 can be reduced and the size of the stator core 351 can be kept unchanged.

(Second Embodiment)
FIG. 3 is a longitudinal sectional view showing a motor according to a second embodiment of the present invention. The second embodiment is different from the first embodiment only in the configuration of the torque reducing magnet. Only this different configuration will be described below. In the second embodiment, the same reference numerals as those in the first embodiment are the same as those in the first embodiment, and the description thereof is omitted.

  As shown in FIG. 3, the radial size M2 of the magnet 362A is smaller than the radial size M1 of the magnet insertion hole 361a. By carrying out like this, in this thin magnet 362A, magnetic force can be reduced compared with the general magnet which has the same thickness as the magnitude | size M1 of the magnet insertion hole 361a. That is, the thin magnet 362A can be said to be a torque reducing magnet for reducing the torque of the shaft 31.

  On the other hand, the axial length of the magnet 362A is the same as the axial length of the rotor core 361.

  The magnet 362A is a neodymium magnet and is formed in a plate shape. The magnet 362A is located in the radially outer portion of the magnet insertion hole 361a. A nonmagnetic material 363 as a positioning member is provided in the magnet insertion hole 361a on the radially inner side of the magnet 362A. The nonmagnetic material 363 positions the magnet 362A with respect to the rotor core 361.

  According to the motor of the second embodiment, the rotor 36 includes the torque reducing magnet 362A, so that the output of the motor can be reduced by the torque reducing magnet 362A.

  Accordingly, in order to reduce the output of the motor, it is not necessary to reduce the axial length and the radial size of the rotor core 361 and the stator core 351. By using the torque reducing magnet 362A, the rotor core 361 and the stator core 351 can be secured to a certain size, and a strong, low-output motor can be manufactured.

  Furthermore, when a plurality of torque reducing magnets 362A having different sizes (thicknesses) in the radial direction are prepared and motors having different outputs are manufactured, the rotor core 361 is simply changed by changing the torque reducing magnets 362A having different thicknesses. In addition, the stator core 351 can be shared, and the series for each motor output can be easily and inexpensively performed.

  Also, the radial size M2 of the torque reducing magnet 362A is smaller than the radial size M1 of the rotor core 361. As described above, it is possible to reduce the cost by reducing the size of the expensive magnet 362A in the radial direction.

(Third embodiment)
FIG. 4 is a longitudinal sectional view showing a motor according to a third embodiment of the present invention. The third embodiment is different from the first embodiment only in the configuration of the torque reducing magnet. Only this different configuration will be described below. In the third embodiment, the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 4, the magnet 362B is a ferrite magnet. By carrying out like this, in this ferrite magnet 362B, magnetic force can be reduced compared with a general neodymium magnet. That is, the ferrite magnet 362B can be said to be a torque reducing magnet for reducing the torque of the shaft 31. The size of the magnet 362B is the same as the size of the magnet insertion hole 361a.

  According to the motor of the third embodiment, the rotor 36 includes the torque reducing magnet 362B, so that the output of the motor can be reduced by the torque reducing magnet 362B.

  Accordingly, in order to reduce the output of the motor, it is not necessary to reduce the axial length and the radial size of the rotor core 361 and the stator core 351. By using the torque reducing magnet 362B, the rotor core 361 and the stator core 351 can be secured to a certain size, and a strong, low-output motor can be manufactured.

  The torque reducing magnet 362B is a ferrite magnet. Thus, cost reduction can be achieved by using an inexpensive magnet 362B.

(Fourth embodiment)
FIG. 5 is a longitudinal sectional view showing a motor according to a fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment only in the configuration of the rotor. Only this different configuration will be described below. In the fourth embodiment, the same reference numerals as those in the first embodiment are the same as those in the first embodiment, and the description thereof is omitted.

  As shown in FIG. 5, in this rotor 36A, the axial length L3 of the rotor core 361A and the axial length L4 of the magnet 362C are larger than the axial length L5 of the stator core 351 of the stator 35. short. The length L3 of the rotor core 361A and the length L4 of the magnet 362C are substantially the same.

  By carrying out like this, in this magnet 362C, magnetic force can be reduced compared with the general magnet which has the same length as the length L5 of the stator core 351. That is, the magnet 362C can be said to be a torque reducing magnet for reducing the torque of the shaft 31.

  Further, in this rotor core 361A, the moment of inertia can be made smaller than that of a general rotor core having the same length as the length L5 of the stator core 351.

  According to the motor of the fourth embodiment, the axial length L3 of the rotor core 361A and the axial length L4 of the torque reducing magnet 362C are the axial length L5 of the stator core 351. Therefore, the output of the motor can be reduced.

  Accordingly, in order to reduce the output of the motor, it is not necessary to reduce the axial length and the radial size of the stator core 351, the stator core 351 can be secured to a certain size, and the strength and low output can be reduced. A motor can be manufactured.

  Furthermore, when manufacturing motors with different outputs, the stator core 351 can be shared, and the series for each motor output can be easily and inexpensively performed.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the feature points of the first to fourth embodiments may be variously combined.

  The torque reducing magnet has at least one of a configuration in which the axial length is shortened, a configuration in which the radial size (thickness) is small, and a configuration using a ferrite magnet. May be.

  The engine output shaft, the pump rotation shaft, and the motor shaft may be integrally formed.

  In addition, the motor having the above-described configuration may be applied only to a power generation motor that generates power using an engine or only to an assist motor that assists driving of the engine.

  Moreover, you may use the motor of the said structure for machine products other than the hybrid structure for construction machines.

DESCRIPTION OF SYMBOLS 1 Engine 2 Pump 3 Motor 10 Engine main body 11 Output shaft 12 Flywheel 13 Engine housing 130 Main body housing 131 Flywheel housing 20 Pump main body 21 Rotating shaft 23 Pump housing 230 Main body housing 231 Mounting plate 31 Shaft 33 Motor housing 35 Stator 351 Stator core 352 Stator coil 36, 36A Rotor 361, 361A Rotor core 361a Magnet insertion hole 362, 362A, 362B, 362C Magnet (magnet for torque reduction)
363 Non-magnetic material (positioning member)
37 Coupling L1, L3 Rotor core axial length L2, L4 Magnet axial length L5 Stator core axial length M1 Magnet insertion hole radial size M2 Magnet radial size

Claims (7)

A motor housing (33);
A stator (35) mounted in the motor housing (33);
A rotor (36, 36A) disposed radially inward of the stator (35);
A shaft (31) fixed to the rotor (36, 36A),
The rotor (36, 36A)
A rotor core (361, 361A);
A motor having torque reduction magnets (362, 362A, 362B, 362C) attached to the rotor core (361, 361A) and for reducing the torque of the shaft (31). The motor according to claim 1,
An axial length (L2) of the torque reducing magnet (362) is shorter than an axial length (L1) of the rotor core (361). The motor according to claim 1 or 2,
The rotor core (361) has a magnet insertion hole (361a) for inserting the torque reducing magnet (362A),
The radial size (M2) of the torque reducing magnet (362A) is smaller than the radial size (M1) of the magnet insertion hole (361a) of the rotor core (361). motor. The motor according to any one of claims 1 to 3,
The motor for reducing torque (362B) is a ferrite magnet. The motor according to any one of claims 2 to 4,
A motor comprising a nonmagnetic positioning member (363) for positioning the torque reducing magnets (362, 362A, 362B) with respect to the rotor core (361). The motor according to claim 1,
The axial length (L3) of the rotor core (361A) and the axial length (L4) of the torque reducing magnet (362C) are in the axial direction of the stator core (351) of the stator (35). A motor characterized by being shorter than a length (L5). Engine (1),
A pump (2);
A motor (3) according to any one of claims 1 to 6, arranged between the engine (1) and the pump (2),
The shaft (31) of the motor (3) is connected between the output shaft (11) of the engine (1) and the rotating shaft (21) of the pump (2),
The construction machine hybrid structure, wherein the motor housing (33) of the motor (3) is connected to a flywheel housing (131) of the engine (1).

Images