JP2004147410A - Multilayer coaxial rotating machine and hybrid drive system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized double rotor motor suited to a vehicle. <P>SOLUTION: This double rotor motor 1000 is coaxially-arranged with an internal motor 1300 and an external motor 1200. The internal motor 1300 has an internal rotor 302 and an internal stator 304, and the external motor 1200 has an external rotor 202 and an external stator 204. The double rotor motor 1000 includes an internal motor tachometer 1350 for detecting the rotational speed of the internal motor 1300 provided on its end, an external motor tachometer 1250 for detecting the rotational speed of the external motor 1200, and a planetary gear device 1400 connected to the external motor 1200 and the internal motor 1300 provided on an end on the opposite side. The thrust center of the internal stator 304 and the thrust center of the external stator 204 are shifted in the axial direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multilayer coaxial rotary electric machine mounted on a vehicle, and more particularly, to a multilayer coaxial rotary electric machine used for a hybrid system mounted with two or more types of power sources such as an engine and a motor.
[0002]
[Prior art]
A vehicle equipped with a power train called a hybrid system in which an engine (for example, a known engine such as a gasoline engine or a diesel engine may be used) and an electric motor has been developed and put into practical use. In such a vehicle, the operation by the engine and the operation by the electric motor are automatically switched irrespective of the accelerator operation amount of the driver, and are controlled so that the efficiency is maximized.
[0003]
In such a hybrid system, there is a system that divides engine power into a driving force transmitted to driving wheels and a driving force transmitted to a generator by a power split mechanism using planetary gears (planetary gears). . The electric power generated by the generator is used directly for driving the motor, or converted into direct current by an inverter and stored in a high-voltage battery. By controlling the rotation speed of the generator, the power split device also functions as a continuously variable transmission. The engine torque is input to the planetary carrier, and the input torque is transmitted to the generator by the sun gear and to the motor and output shaft by the ring gear. Therefore, in such a hybrid system, a power split mechanism including a motor, a generator, a planetary gear mechanism, and the like is required.
[0004]
Japanese Patent Application Laid-Open No. 2001-190006 (Patent Document 1) discloses such a hybrid vehicle. The hybrid vehicle described in Patent Literature 1 includes an engine, a first motor, a second motor, and at least first to third rotating elements. The rotation of the engine is input to the first rotating element. A gear unit in which the rotation of the first motor is input to the second rotation element and the rotation of the third rotation element and the second motor are output to the output shaft, and the engine is operated at optimum efficiency by controlling the first motor. Controller.
[0005]
According to this hybrid vehicle, the rotation of the engine and the second motor is applied to the sun gear serving as the first rotating element as the planetary gear unit, the rotation of the first motor is applied to the ring gear serving as the second rotating element, and the third rotation is applied. The rotation of the planet carrier, which is an element, is output to the output shaft. The first motor and the second motor also function as a generator. This hybrid vehicle can operate the engine with maximum efficiency in any of the stopped state, the low-speed running state, the high-speed running state, and the reverse state, that is, in the stopped state, the engine is fixed and the planet carrier is fixed. The motor is rotated at the maximum efficiency, and the rotation is transmitted to the first motor and the second motor to generate electric power by both motors. In the low-speed running state, the engine is rotated at the maximum efficiency, the rotation of the engine and the rotation of the second motor are transmitted to the sun gear, and the rotation of the first motor is transmitted to the ring gear. The rotation is transmitted at a rotation speed determined by the first motor rotation speed. In the high-speed running state, the vehicle is driven with the engine rotated at the maximum efficiency and with the second motor speed further increased. In the reverse state, the vehicle is driven with the engine being rotated at the maximum efficiency and the first motor being rotated in the reverse direction. In this manner, the engine can be rotated with maximum efficiency in various driving states of the vehicle.
[0006]
[Patent Document 1]
JP 2001-190006 A
[Problems to be solved by the invention]
However, in the hybrid vehicle described in Patent Literature 1, the first motor and the second motor have a structure in which they are arranged in parallel in the axial direction, and thus have a very long structure in the axial direction. In a vehicle, the space for mounting the engine and the power split device is limited, and it is not easy to mount such an axially long structure. Further, it is conceivable to use a so-called double rotor structure in which the first motor and the second motor have a double structure in order to reduce the axial length. However, the conventional motor having the double rotor structure is limited to a small-sized low-speed rotating machine, and cannot be applied to a vehicle requiring high rotation and high output. Further, even if such a double rotor structure is adopted and only the motor is shortened in the axial direction, the power train including other power split mechanisms such as a planetary gear mechanism cannot be downsized.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small-sized multilayer coaxial rotating electric machine suitable for a vehicle and a hybrid drive system using the same.
[0009]
[Means for Solving the Problems]
In the multilayer coaxial rotating electric machine according to the first invention, an inner first rotating electric machine and an outer second rotating electric machine are coaxially arranged. Each of the first rotating electric machine and the second rotating electric machine has a pair of rotors and a stator. The multi-layer coaxial rotary electric machine includes a detection unit provided at an axial end of the rotary electric machine for detecting a rotation speed of the rotary electric machine, and a first unit provided at an end opposite to the end. And a planetary gear mechanism connected to the rotating electric machine and the second rotating electric machine. The thrust center of the stator of the first rotating electric machine and the thrust center of the stator of the second rotating electric machine are arranged so as to be displaced in the axial direction.
[0010]
According to the first aspect, the detecting means detects the number of rotations of the first rotating electric machine and the number of rotations of the second rotating electric machine for controlling the vehicle on which the multilayer coaxial rotating electric machine is mounted. A planetary gear mechanism is provided at the end opposite to the end provided with the detection means. The first rotating electric machine and the second rotating electric machine are arranged such that the thrust centers of the respective stators are shifted from each other in the axial direction. Thus, the planetary gear mechanism and the detecting means can be incorporated in a space generated by shifting the first rotating electrical machine and the second rotating electrical machine in the thrust direction. Therefore, it is possible to reduce the size of the power split mechanism including the two rotating electric machines, the detecting unit for the number of revolutions of the rotating electric machines, and the planetary gear mechanism to which the output of the rotating electric machines is transmitted. At this time, both the first rotating electric machine and the second rotating electric machine need not have their stators and rotors shortened, so that high output and high rotation can be realized. As a result, a small-sized multilayer coaxial rotating electric machine suitable for a vehicle can be provided.
[0011]
The multi-layer coaxial rotating electric machine according to a second aspect of the present invention has, in addition to the configuration of the first aspect, an outer diameter of the planetary gear mechanism is smaller than an inner diameter of the stator of the second rotating electric machine, and at least one of the planetary gear mechanisms is provided. The part and the second rotating electric machine have an overlap in the axial direction.
[0012]
According to the second invention, when the first rotating electric machine and the second rotating electric machine have the same length in the axial direction, the inner first rotating electric machine and the outer second rotating electric machine are separated from each other. Due to the displacement in the thrust direction, a space is generated inside at one end in the axial direction. Since the planetary gear mechanism can be arranged in this space in an overlapping manner, the size can be reduced by combining the two rotating electric machines and the planetary gear mechanism to which the outputs of the rotating electric machines are transmitted.
[0013]
The multilayer coaxial rotary electric machine according to a third aspect of the present invention, in addition to the configuration of the first aspect, has an outer diameter of the planetary gear mechanism smaller than an inner diameter of the stator of the second rotary electric machine, and a radial direction of the second rotary electric machine. At least a part of the planetary gear mechanism is arranged inside.
[0014]
According to the third aspect, when the first rotating electric machine and the second rotating electric machine have the same length in the axial direction, the inner first rotating electric machine and the outer second rotating electric machine are separated from each other. Due to the displacement in the thrust direction, a space is created radially inward at one end in the axial direction. Since at least a part of the planetary gear mechanism can be arranged in this space, the size can be reduced by combining the two rotating electric machines and the planetary gear mechanism to which the outputs of the rotating electric machines are transmitted.
[0015]
The multilayer coaxial rotary electric machine according to a fourth aspect of the present invention is the multi-layer coaxial rotary electric machine according to any one of the first to third aspects of the present invention, in which the support shaft of the rotor of the second rotary electric machine has a rotation diameter at an end on the planetary gear mechanism side. In order to be small, it includes a support member in a direction perpendicular to the axis.
[0016]
According to the fourth aspect, the supporting member reduces the rotating diameter of the supporting shaft of the rotor, which is the rotating portion of the second rotating electric machine, at the end on the planetary gear mechanism side. By reducing the rotation support diameter of the rotor of the outer second rotating electrical machine, the peripheral speed at the support portion can be suppressed. Thereby, the rotation speed of the second rotating electric machine can be increased. If high rotation and high output can be realized, the stator and the rotor can be further shortened in the axial direction. As a result, the size of the multilayer coaxial rotating electric machine can be further reduced.
[0017]
A hybrid drive system according to a fifth aspect includes the multilayer coaxial rotating electric machine having the configuration according to any one of the first to fourth aspects, and an internal combustion engine.
[0018]
According to the fifth aspect, in the multilayer coaxial rotary electric machine, the inner first rotary electric machine and the outer second rotary electric machine are shifted in the thrust direction, so that one end in the axial direction has an inner side. Space occurs. In this space, the planetary gear mechanism can be arranged in an overlapping manner. Thus, a hybrid drive system including a multilayer coaxial rotary electric machine reduced in size by combining two rotary electric machines and a planetary gear mechanism to which outputs of the rotary electric machines are transmitted, and an internal combustion engine such as an engine Can be realized.
[0019]
In a hybrid drive system according to a sixth aspect, in addition to the configuration of the fifth aspect, the rotor of the first rotating electrical machine is connected to a sun gear of a planetary gear mechanism, and the rotor of the second rotating electrical machine is a planetary gear. The rotating shaft of the internal combustion engine is connected to the planet carrier of the planetary gear mechanism.
[0020]
According to the sixth invention, the rotor of the first rotating electric machine is used as the sun gear of the planetary gear mechanism, the rotor of the second rotating electric machine is used as the ring gear of the planetary gear mechanism, the rotating shaft of the internal combustion engine is used as the planetary gear mechanism. Connect to each planet carrier. The hybrid drive system configured in this way ensures excellent drivability such as smooth start and acceleration, and controls the distribution of the torque of the internal combustion engine and the torque of the rotating electric machine to maximize fuel efficiency. can do.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are the same. Therefore, detailed description thereof will not be repeated.
[0022]
<First embodiment>
Hereinafter, the double rotor motor according to the first embodiment of the present invention will be described. As shown in FIG. 1, the double rotor motor 100 according to the present embodiment is configured such that the outer motor 200 and the inner motor 300 have the same rotation center. The thrust center axis 250 of the outer motor 200 and the thrust center axis 350 of the inner motor 300 are shifted in the thrust direction. The outer motor 200 and the inner motor 300 are housed in a casing 110.
[0023]
The outer motor 200 includes an outer rotor 202, an outer stator 204 provided to face the outer rotor 202, and bearings 220 and 222 that support a rotation shaft 210 of the outer rotor 202. The outer rotor 202 and the outer stator 204 have the same axial length. In addition, the center axis of the outer rotor 202 in the thrust direction coincides with the center axis of the outer stator 204 in the thrust direction. The rotating shaft 210 of the outer rotor 202 is supported by a double-sided structure including a bearing 220 supported by the bearing support 112 of the casing 110 and a bearing 222 supported by the bearing support 114 of the casing 110. The rotation shaft 210 of the outer rotor 202 is connected to a ring gear of a planetary gear mechanism described later.
[0024]
The inner motor 300 includes an inner rotor 302, an inner stator 304 provided to face the inner rotor 302, and bearings 320 and 322 that support a rotating shaft 310 of the inner rotor 302. The axial length of the inner rotor 302 and the axial length of the inner stator 304 are substantially the same. The center axis of the inner rotor 302 in the thrust direction coincides with the center axis of the inner stator 304 in the thrust direction. The rotating shaft 310 of the inner rotor 302 is supported by a double-supported structure including a bearing 320 and a bearing 322 supported by the bearing support 116 of the casing 110.
[0025]
In this manner, the center of the outer motor 200 in the thrust direction is offset from the center of the inner motor 300 in the thrust direction, so that a space is created inside the outer rotor 202. A planetary gear mechanism can be provided in this space. Further, a space is provided outside the inner motor 300 and inside the casing 110. An outer motor tachometer for detecting the number of rotations of the outer rotor 202 can be provided in this space.
[0026]
As described above, according to the double rotor motor according to the present embodiment, the outer motor and the inner motor are arranged with their respective axial centers shifted from each other so that the centers of the rotating shafts are aligned. Therefore, a space is generated inside the outer motor, and a space is generated outside the inner motor. By installing a planetary gear mechanism and a tachometer in each space, a power split mechanism consisting of two motors, a tachometer of each motor and a planetary gear mechanism to which each motor is connected is provided. The size can be reduced. In this miniaturization, since the axial length of the rotor of each motor and the axial length of the stator are not shortened, it is possible to realize a motor with a high rotation speed and a high output as compared with a conventional double rotor motor. it can.
[0027]
<Second embodiment>
Hereinafter, a double rotor motor according to a second embodiment of the present invention will be described. The double rotor motor according to the present embodiment is different from the double rotor motor according to the first embodiment in the structure of the rotation shaft of the outer rotor.
[0028]
Referring to FIG. 2, the structure of double rotor motor 1000 according to the present embodiment will be described. Double rotor motor 1000 includes an outer motor 1200 and an inner motor 1300. In the double rotor motor 1000, similarly to the double rotor motor 100 according to the first embodiment described above, the center axis 250 in the thrust direction of the outer motor 1200 and the center axis 350 in the thrust direction of the inner motor 1300 are shifted. These outer motor 1200 and inner motor 1300 are housed in casing 1110.
[0029]
Outer motor 1200 includes outer rotor 202 and outer stator 204. The outer rotor 202 is supported by a rotating shaft 1214. The rotating shaft 1214 has a support member 1212 that shortens the radial direction on the planetary gear mechanism side. The rotating shaft 1214 is connected to the rotating shaft 1210 on the planetary gear mechanism side further than the supporting member 1212. The rotating shaft 1210 is supported by a bearing 1220 and a bearing 1222 supported by a bearing support 1115 of the casing 1110. That is, the rotation axis of rotor 200 of outer motor 1200 of double rotor motor 1000 according to the present embodiment is supported in a cantilever structure.
[0030]
Inner motor 1300 includes inner rotor 302 and inner stator 304. The rotating shaft 310 of the inner rotor 302 is supported by a bearing 320 supported by a bearing support member 1114 and a bearing 322 supported by a bearing support 1116 of the casing 1110. That is, the rotor 302 of the inner motor 1300 is supported by a double-ended structure including the bearing 320 and the bearing 322.
[0031]
<Third embodiment>
Hereinafter, a double rotor motor according to a third embodiment of the present invention will be described.
[0032]
As shown in FIG. 3, the double rotor motor 1000 according to the present embodiment has a planetary gear mechanism 1400 installed in a direction in which the outer motor 1200 is shifted, in addition to the structure described in FIG. An outer motor tachometer 1250 and an inner motor tachometer 1350 provided on the side are further included.
[0033]
As shown in FIG. 3, a part of the planetary gear mechanism 1400 is disposed so as to overlap with a part of the outer motor 1200 in the axial direction. That is, the outer diameter of the planetary gear mechanism 1400 is larger than the outer diameter of the outer stator 204 of the outer motor 1200. Since the outer stator 204 has a substantially hollow cylindrical shape, the planetary gear mechanism 1400 can be incorporated and arranged in the hollow portion. Accordingly, the axial length can be shortened by combining the outer motor 1200 and the planetary gear mechanism 1400 without shortening the axial length of the rotor 202 and the stator 204 of the outer motor 1200.
[0034]
Further, an outer motor tachometer 1250 provided at the opposite end of the planetary gear mechanism 1400 is provided further outside the inner stator 304 of the inner motor 1300. The space in which the outer motor tachometer 1250 is provided is on the opposite side to the side where the planetary gear mechanism 1400 is provided, which is generated by shifting the center of the outer motor 1200 in the thrust direction and the center of the inner motor 1300 in the thrust direction. Space. An outer motor tachometer 1250 was provided in this space. Thus, the total length of the double rotor motor including the tachometer that measures the rotation speed of the outer motor 1200 and the rotation speed of the inner motor 1300, which are indispensable for controlling a vehicle equipped with such a double rotor motor 1000, is reduced. Can be shorter.
[0035]
As described above, in the double rotor motor according to the present embodiment, the axial center of the outer motor in the thrust direction is shifted from the axial center of the inner motor. The planetary gear mechanism was installed in the space created by displacing the axial center in the thrust direction, and a tachometer was installed. This makes it possible to reduce the size of the power split mechanism including the two motors, the tachometer for detecting the rotation speed of the motors, and the planetary gear mechanism to which the outputs of the two motors are transmitted.
[0036]
Note that an engine output shaft may be connected to the planetary gear mechanism 1400 of the double rotor motor 1000 according to the present embodiment to realize a hybrid drive system. At this time, the rotation shaft of the engine is connected to the planet carrier of the planetary gear mechanism 1400. The rotation shaft of the inner motor is connected to the sun gear of the planetary gear mechanism 1400. The rotation shaft of the outer motor is connected to the ring gear of the planetary gear mechanism 1400.
[0037]
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing a structure of a double rotor motor according to a first embodiment of the present invention.
FIG. 2 is a diagram schematically showing a structure of a double rotor motor according to a second embodiment of the present invention.
FIG. 3 is a sectional view illustrating a structure of a double rotor motor according to a third embodiment of the present invention.
[Explanation of symbols]
100, 1000 double rotor motor, 110, 1110 casing, 112, 114, 116, 1112, 1114, 1116 bearing support, 200, 1200 outer motor, 202 outer rotor, 204, 205 outer stator, 210, 1210 outer motor rotating shaft , 220, 222, 1220, 1222 outer rotor bearings, 300, 1300 inner motor, 302 inner rotor, 304, 305 inner stator, 310 inner motor rotation axis, 320, 322 inner rotor bearing, 1250 outer motor tachometer, 1350 inner motor Tachometer, 1400 planetary gear mechanism.

Claims (6)

A multilayer coaxial rotary electric machine in which an inner first rotary electric machine and an outer second rotary electric machine are coaxially arranged, wherein each of the first rotary electric machine and the second rotary electric machine has a pair of a rotor and a stator. Having the multilayer coaxial rotating electric machine,
Detecting means provided at an axial end of the rotating electric machine, for detecting the number of revolutions of the rotating electric machine,
A planetary gear mechanism connected to the first rotating electric machine and the second rotating electric machine, provided at an end opposite to the end,
A multilayer coaxial rotary electric machine, wherein a thrust center of a stator of the first rotary electric machine and a thrust center of a stator of the second rotary electric machine are arranged so as to be shifted in an axial direction. The outer diameter of the planetary gear mechanism is smaller than the inner diameter of the stator of the second rotating electric machine, and at least a part of the planetary gear mechanism and the second rotating electric machine have an axial overlap. Item 2. The multilayer coaxial rotating electric machine according to Item 1. 2. The outer diameter of the planetary gear mechanism is smaller than the inner diameter of the stator of the second rotating electric machine, and at least a part of the planetary gear mechanism is disposed radially inside the second rotating electric machine. 3. 2. The multilayer coaxial rotating electric machine according to item 1. The support shaft of the rotor of the second rotating electrical machine includes a support member in a direction perpendicular to the shaft such that a rotation diameter decreases at an end on the planetary gear mechanism side. The multilayer coaxial rotating electric machine according to the above. A hybrid drive system comprising the multilayer coaxial rotating electric machine according to claim 1 and an internal combustion engine. The rotor of the first rotating electrical machine is connected to a sun gear of the planetary gear mechanism, the rotor of the second rotating electrical machine is connected to a ring gear of the planetary gear mechanism, and a rotating shaft of the internal combustion engine is connected to the planetary gear. The hybrid drive system according to claim 5, wherein the hybrid drive system is connected to a planet carrier of a gear mechanism.

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