JP2008125195A - Electric motor and hybrid vehicle - Google Patents

Abstract

An object of the present invention is to provide an electric motor having a rotor having a permanent magnet and capable of exhibiting a sufficient demagnetizing action in a high-speed rotation region without performing field-weakening control.
An electric motor according to the present invention includes a stator, a rotating shaft that rotates in conjunction with a rotor, and a first rotor portion that is disposed in the axial direction and uses a permanent magnet. The rotor 20 includes a second rotor portion 20b that does not use a permanent magnet, and a displacement mechanism that displaces the relative positional relationship between the stator 30 and the rotor 20 in the axial direction.
[Selection] Figure 1

Description

  The present invention relates to an electric motor and a hybrid vehicle, and more particularly to an electric motor using a rotor having a permanent magnet and a hybrid vehicle equipped with the electric motor.

  An electric motor using a rotor provided with a permanent magnet is widely used in vehicles and the like because of its high output and high efficiency. The operating condition of the electric motor using the rotor having such a permanent magnet is that the sum of the induced voltage and the voltage drop in the electric motor (decrease caused by the current flowing through the coil) can be output from the inverter to the electric motor. It is to be below the voltage. In an electric motor, an induced electromotive force (induced voltage) is determined by a magnetic flux generated by a permanent magnet provided in a rotor and a rotational angular velocity of the electric motor. That is, when the rotational angular velocity of the electric motor increases, the induced voltage of the electric motor increases in proportion. When the induced voltage becomes dominant, the current that can flow through the electric motor decreases. Since the torque in the electric motor is proportional to the current, high torque output operation is difficult in the high rotation region where the induced voltage is dominant.

  In order to solve this problem, there is an electric motor using means for expanding a high rotation region by field weakening control. However, in the field weakening control, it is necessary to increase the field weakening control current in accordance with the induced electromotive force that increases in proportion to the rotational angular velocity, so that there is a problem that the efficiency of the electric motor is reduced in a high rotation region.

  As a technique for demagnetizing during high-speed rotation without performing field-weakening control, for example, Patent Document 1 is proposed. In Patent Document 1, a permanent magnet linear motion mechanism that pulls out a permanent magnet of a permanent magnet motor in the axial direction at the time of high-speed rotation is provided. It is held and moves in the radial direction by its own centrifugal force, and the permanent magnet moves in the axial direction to deviate from the rotor core and demagnetize during high-speed rotation.

JP 2004-336880 A

  However, the permanent magnet linear motion mechanism of Patent Document 1 has a problem in that a sufficient amount of demagnetization cannot be achieved during high-speed rotation because the amount of movement of the permanent magnet in the axial direction cannot be increased. Further, when the axial movement amount of the permanent magnet is increased, the axial thickness of the motor is increased.

  The present invention has been made in view of the above, and in an electric motor having a rotor provided with a permanent magnet, an electric motor capable of exhibiting a sufficient demagnetizing action in a high-speed rotation region without performing field-weakening control. And it aims at providing the hybrid vehicle carrying the electric motor.

  In order to solve the above-described problems and achieve the object, the present invention provides a stator, a first rotor portion using a permanent magnet, which is arranged in the axial direction, and a first rotor portion which does not use the permanent magnet. A rotor including two rotor portions, a rotating shaft that rotates in conjunction with the rotor, the stator, and a displacement mechanism that displaces a relative positional relationship in the axial direction of the rotor. And

  According to a preferred aspect of the present invention, the displacement mechanism is configured such that the first rotor portion is opposed to the stator in the low-speed rotation region, and the second rotor portion is in the high-speed rotation region. It is desirable to move the rotor so as to be in a position facing the stator.

  Further, according to a preferred aspect of the present invention, it is desirable that the second rotor portion is composed of an induction rotor, a synchronous reluctance rotor, or a switched reluctance rotor.

  According to a preferred aspect of the present invention, it is desirable that the displacement mechanism moves the rotor in the axial direction using a centrifugal force corresponding to a rotational speed.

  According to a preferred aspect of the present invention, the displacement mechanism uses a first urging means for urging the rotor in one of the axial directions and a centrifugal force corresponding to the rotational speed. And a second urging means for urging the rotor in the other direction of the axial direction.

  Further, according to a preferred aspect of the present invention, the second urging means is provided on the flywheel connected to the rotating shaft and the flywheel, and is radially outward from the radially inner side according to the centrifugal force. And a wire having one end fixed to the weight and the other end fixed to the rotor and pulling the rotor in the other axial direction.

  According to a preferred aspect of the present invention, it is desirable to mount the electric motor of the present invention on a hybrid vehicle.

  According to the present invention, a rotor including a stator, a first rotor portion using a permanent magnet, and a second rotor portion not using the permanent magnet, which are arranged in the axial direction with each other, and the rotor In the electric motor having a rotor with a permanent magnet, since the rotation shaft that rotates in conjunction with, a displacement mechanism that displaces the relative positional relationship in the axial direction of the stator and the rotor, A sufficient demagnetizing action can be achieved in the high-speed rotation region without performing field weakening control.

  Hereinafter, the best mode of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or that are substantially the same.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view in the axial direction of an electric motor according to an embodiment of the present invention, and particularly shows a cross-sectional configuration during low-speed rotation. FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. FIG. 3 is a cross-sectional view taken along the line BB ′ of FIG. 1 (Example 2 of the second rotor portion). FIG. 4 shows a cross-sectional view taken along the line BB ′ of FIG. 1 (Example 2 of the second rotor portion). FIG. 5 shows a cross-sectional view taken along the line BB ′ of FIG. 1 (Example 3 of the second rotor portion). FIG. 6 shows a CC ′ arrow view of FIG. FIG. 7 is a schematic cross-sectional view in the axial direction of the electric motor according to the embodiment of the present invention, and particularly shows a cross-sectional configuration during high-speed rotation. FIG. 8 shows a CC ′ arrow view of FIG.

  In FIG. 1, an electric motor 1 includes a housing 10 and a rotor including a first rotor portion 20 a using a permanent magnet and a second rotor portion 20 b not using a permanent magnet, which are arranged in the axial direction. (Rotor) 20, stator (stator) 30, rotating shaft 40 that rotates in conjunction with rotor 20, and a displacement mechanism that displaces the relative positional relationship between stator 30 and rotor 20 in the axial direction. ing.

  A stator 30 is fixed to the inner peripheral surface of the peripheral wall of the housing 10, and the stator 30 is configured by winding a stator coil 32 around a stator body 31. Inside the stator 30 in the radial direction, the rotor 20 and the rotating shaft 40 are rotatably accommodated.

  The rotary shaft 40 is composed of a first rotary shaft 40a and a second rotary shaft 40b, and a space 41 is formed between them. The front side of the first rotating shaft 40a is rotatably supported on the housing 10 via a bearing 43, and is connected to a flywheel 60 that is an inertia weight means. Further, as shown in FIGS. 1 and 2, a plurality of insertion holes 42a through which the wires 71 are inserted are formed in the first rotating shaft 40a.

  A spacer 45 having a ring shape is fixed to the bearing 43. A spring 50, which is a first urging means, is disposed in the outer circumferential direction of the first rotating shaft 40a. One end of the spring 50 is fixed to the spacer 45, and the other end is the rotor. 20, the rotor 20 is biased in the axial rear direction (one direction).

  The rear side (output side) of the second rotating shaft 40 b is rotatably supported by the housing 10 via a bearing 44. The first rotating shaft 40a and the second rotating shaft 40b are provided with a guide for the rotor 20 to move in the axial direction and the operations in the circumferential direction of the first rotating shaft 40a and the second rotating shaft 40b. Recesses (key grooves) 41a and 41b for rotating together with the rotor 20 are formed.

  The flywheel 60 has a disk shape, is fixed to the front side of the first rotation shaft 40a, and rotates together with the first rotation shaft 40a. The flywheel 60 applies inertial force to the rotating shaft 40 to stabilize its rotation. As shown in FIGS. 1 and 6, a plurality of spaces 61 are formed in the flywheel 60, and weights 70 are arranged in the spaces 61. Further, the flywheel 60 is formed with a plurality of insertion holes 62 for inserting the wires 71. One end of the wire 71 is fixed to one end surface of the weight 70, and the other end is inserted through the insertion hole 62 of the flywheel 60 and the insertion hole 42 a of the first rotating shaft 40 a, It is fixed on the circumferential side. The weight 70 moves from the inside in the radial direction to the outside by a centrifugal force corresponding to the rotational speed of the flywheel 60. That is, when the flywheel 60 rotates at a high speed, the weight 70 increases in centrifugal force and moves to the outside in the radial direction.

  In the above configuration, the flywheel 60, the weight 70, the wire 71, and the spring 50 constitute a displacement mechanism that moves the rotor 20 in the axial direction, and the spring 50 moves the rotor 20 in the axial rear direction (one direction). The first urging means for urging is constituted, and the flywheel 60, the weight 70, and the wire 71 constitute second urging means for urging the rotor 20 in the front direction (the other direction).

The rotor 20 includes a first rotor portion 20a configured with a permanent magnet rotor, a second rotor portion 20b configured with a reluctance shape, a hysteresis shape, or the like that does not use a permanent magnet,
A pair of end face plates 21 provided on both end faces of the rotor 20, and flanges for connecting the first rotor part 20a and the second rotor part 20b to the first rotary shaft 40a and the second rotary shaft 40b, respectively. 22.

  The flange 22 is formed in an outer circumferential direction and an inner circumferential direction at a substantially intermediate position in the axial direction, divides the first rotor portion 20a and the second rotor portion 20b, and a separate portion to which one end side of the wire 71 is fixed. 22a, and convex portions 22b that engage with the concave portions 41a and 41b of the first rotary shaft 40a and the second rotary shaft 40b, as shown in FIGS. Is formed.

  The rotor 20 configured as described above is configured to be movable in the axial direction by the convex portion 22b of the flange 22 being guided by the concave portions 41a and 41b of the first rotary shaft 40a and the second rotary shaft 40b. Further, in the rotor 20, the convex portion 22 a of the flange 22 regulates the circumferential operation of the first rotating shaft 40 a and the second rotating shaft 40 b and rotates the rotating shaft 40 in conjunction with each other. In addition, the rotor 20 is biased in the axial rear direction (one direction) by the spring 50, and in the axial front direction (the other direction) by the wire 71 fixed to the weight 70 of the flywheel 60. It is biased (pulled), and moves to an axial position where the centrifugal force of the weight 70 and the biasing force of the spring 50 acting on the rotor 20 balance in vector.

  Next, the rotor 20 will be described in detail with reference to FIGS. FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1 and shows a cross-sectional configuration of the first rotor portion 20 a. As described above, the first rotor portion 20a is composed of a permanent magnet rotor, and as shown in FIG. 2, the permanent magnets 24 are spaced apart from each other by 90 degrees on the electromagnetic steel sheet (core) 23 in the axial direction. It is embedded and configured. The polarities of the two permanent magnets 24 adjacent in the circumferential direction are opposite. Here, although an embedded magnet type permanent magnet rotor is used, a surface magnet type permanent magnet rotor may be used.

  As described above, the second rotor portion 20b is composed of a rotor that does not use a permanent magnet. FIG. 3 is a cross-sectional view taken along the line B-B ′ of FIG. 1 and illustrates the first embodiment of the second rotor portion 20 b. In the first embodiment, the second rotor portion 20b is formed of an induction rotor. As shown in FIG. 3, the second rotor portion 20 b according to the first embodiment has a plurality of secondary conductor rods 26 arranged in a ring shape on the main body 25. Since the induction rotor does not include a magnetic force generation member such as a permanent magnet or an electromagnet, an induction voltage is not generated in the stator coil 32 by the induction rotor.

  FIG. 4 is a cross-sectional view taken along the line B-B ′ of FIG. 1 and illustrates a second embodiment of the second rotor portion 20 b. In the second embodiment, the second rotor portion 20b is configured by a synchronous reluctance rotor. As shown in FIG. 4, the second rotor portion 20 b according to the second embodiment is formed of a core 27 made of iron without including a magnetic force generating member such as a permanent magnet or an electromagnet. Since the synchronous reluctance rotor is made of iron that does not include a magnetic force generating member such as a permanent magnet or an electromagnet, no induced voltage is generated in the stator coil 32 by the synchronous reluctance rotor. As the synchronous reluctance rotor, various structures such as an axial laminate type, a flux barrier type, and a segment type shown in the figure can be used.

  FIG. 5 is a cross-sectional view taken along the line B-B ′ of FIG. 1 and illustrates a third embodiment of the second rotor portion 20 b. In the third embodiment, the second rotor portion 20b is configured by a switched reluctance rotor. As shown in FIG. 5, the second rotor portion 20 b according to the third embodiment includes a plurality of salient poles 29 projecting in the radial direction on the outer periphery of a main body 28 formed in a cylindrical shape. Since the switched reluctance rotor does not include a magnetic force generation member such as a permanent magnet or an electromagnet, no induced voltage is generated in the stator coil 32 by the switched reluctance rotor.

  The operation of the permanent magnet motor 1 configured as described above will be described with reference to FIGS. 1, 6, 7, and 8. In the low-speed rotation region, as shown in FIGS. 1 and 6, the urging force of the spring 50 is larger than the centrifugal force acting on the weight 70, and the rotor 20 urges the weight 70 radially inward through the wire 71. 70 is pressed radially inward. As a result, the rotor 20 does not move, and the first rotor portion 20a is located at a position facing the stator 30, so that the amount of magnetic flux of the first rotor portion 20a using a permanent magnet can be increased. Thus, in the low-speed rotation region, the rotor 20 rotates using the first rotor portion 20a as a drive source and functions as a permanent magnet motor.

  In the high-speed rotation region, as shown in FIGS. 7 and 8, the centrifugal force acting on the weight 70 increases and moves radially outward. Thereby, the weight 70 moves the rotor 20 to the front direction against the urging force of the spring 50 via the wire 71. As a result, the area of the first rotor portion 20a facing the stator 30 is reduced, the amount of magnet magnetic flux of the first rotor rotation 20a using a permanent magnet is reduced, and the induced voltage of the stator coil 32 is reduced. On the other hand, the 2nd rotor part 20b which does not use a permanent magnet becomes a position which opposes the stator 30, and the area which opposes becomes large. Since the second rotor part 20b does not use a permanent magnet, no induced voltage is generated in the stator coil 32. Thus, in the high-speed rotation region, the rotor 20 rotates using the second rotor portion 20b as a drive source. In the case of the first embodiment, the induction motor is used. In the case of the second embodiment, the synchronous reluctance rotor is used. Functions as a switched reluctance motor. As a result, an amount of magnetic flux can be reduced during high-speed rotation, and an electric motor having a sufficient demagnetizing function can be realized, and field-weakening control becomes unnecessary.

  As described above, the electric motor according to the first embodiment uses the stator 30, the rotating shaft 40 that rotates in conjunction with the rotor 20, and the permanent magnets 24 that are arranged in the axial direction. A rotor 20 including a first rotor portion 20a and a second rotor portion 20b that does not use a permanent magnet, a stator 30, and a displacement mechanism that displaces the relative positional relationship in the axial direction of the rotor 20; The first rotor portion 20a is opposed to the stator 30 in the low-speed rotation region, and the second rotor portion 20b is opposed to the stator 30 in the high-speed rotation region. The rotor 20 can be moved so as to be in the position, the amount of magnet magnetic flux of the first rotor rotation 20a can be reduced, and the induced voltage of the stator 30 can be reduced. At the time of rolling, exhibit the enough for demagnetization, field-weakening control can be dispensed with.

  Further, according to the electric motor according to the first embodiment, the second rotor portion 20b is configured by an induction rotor, a synchronous reluctance rotor, or a switched reluctance rotor. It is possible to function as an induction motor, a synchronous reluctance motor, or a switched reluctance motor.

  Further, according to the electric motor according to the first embodiment, the displacement mechanism moves the rotor 20 in the axial direction using the centrifugal force according to the rotation speed, and thus the rotor using the centrifugal force is used. Can be moved.

  In addition, according to the electric motor according to the first embodiment, the displacement mechanism has a first urging means (spring 50) for urging the rotor 20 in one axial direction and the rotational speed of the rotary shaft 40. Since the second urging means for urging the rotor 20 in the other axial direction using the corresponding centrifugal force is included, the first urging means acting on the rotor and the rotor 20 is included. The rotor can be moved to an axial position where the urging force of 50 is balanced in vector.

  Further, according to the electric motor according to the first embodiment, the second urging means is provided on the flywheel 60 connected to the rotary shaft 40 and the flywheel 60, and from the radially inner side according to the centrifugal force. Since it includes a weight 70 that moves radially outward, and a wire 71 that has one end fixed to the weight 70 and the other end fixed to the rotor 20 and pulls the rotor 20 in the other axial direction. It is possible to move the rotor using the flywheel 60 connected to the rotating shaft 40.

  In the first embodiment, the rotor 20 is moved in the axial direction in order to displace the relative positional relationship between the stator 30 and the rotor 20 by the displacement mechanism. However, the rotor 20 is fixed to the rotating shaft 40. Then, a configuration in which the rotary shaft 40 is moved in the axial direction together with the rotor 20 or a configuration in which the position of the rotor 20 is fixed and the stator 30 is moved in the axial direction may be adopted.

(Embodiment 2)
In the second embodiment, a hybrid vehicle to which the electric motor 1 of the first embodiment is applied will be described. FIG. 9 is a schematic diagram of a parallel hybrid vehicle to which the electric motor 1 of the first embodiment is applied.

  A hybrid vehicle 100 shown in FIG. 9 includes an engine 101 that is an internal combustion engine that generates driving force of the vehicle, a flywheel 102, a motor generator (hereinafter referred to as “MG”) 103 that functions as an electric motor or a generator, A transmission 104 as a transmission of the vehicle, a battery 105, and a power conversion means 106 are provided. In the figure, reference numeral 110 denotes a crankshaft, and 111 denotes a drive shaft (main shaft). In the above configuration, the electric motor 1 of the first embodiment can be applied to the MG 103 and the flywheel 102.

  A drive shaft 111 is directly connected to a crankshaft 110 of the engine 101 via a flywheel 102. The input shaft of the transmission 104 and the drive shaft 111 of the MG 103 are coupled via a clutch (not shown) that is a power shut-off means, a fluid coupling using fluid (not shown), or a torque converter (not shown). Taken. Thus, by using a clutch, a fluid coupling, or a torque converter to connect the transmission 104 and the MG 103, the engine 101 can be started by the MG 103, and after the engine 101 is started, the driving force of the engine 101, or The driving force of engine 101 and the driving force of MG 103 can be transmitted to the input shaft of transmission 104. This driving force is transmitted to the axle 111 via the transmission 104 and further transmitted to the wheels 112 mounted on the axle 111.

  A battery 105 which is a power storage unit is electrically connected to the MG 103 via a power conversion unit 106. When MG 103 is used as an electric motor, DC power output from battery 105 is converted into AC power by power conversion means 106 (inverter) and supplied to MG 103. Thereby, the MG 103 is driven. The driving force of the MG 103 is used for starting or assisting the engine 101. On the other hand, when MG 103 is used as a generator, AC power generated by MG 103 is converted into DC power by power conversion means 106 (converter) and supplied to battery 105. Thereby, the converted DC power is stored in the battery 105.

  The driving force is used for starting or assisting the engine 101. On the other hand, when MG 103 is used as a generator, AC power generated by MG 103 is converted into DC power by power conversion means 106 (converter) and supplied to battery 105. Thereby, the converted DC power is stored in the battery 105.

  FIG. 10 is a schematic diagram of a serial / parallel hybrid vehicle to which the electric motor 1 of the first embodiment is applied. A hybrid vehicle 200 shown in FIG. 10 includes an engine 201, a flywheel 202, a motor generator mainly functioning as a generator (hereinafter referred to as “MG1”), and a motor generator mainly functioning as an electric motor (hereinafter referred to as “ MG2 ”), flywheel 220, planetary gear 210 as power split means, power conversion means 230 for converting power between DC and AC, and battery 240 for storing power. In the above configuration, the electric motor 1 of the first embodiment can be applied to the MG 2 and the flywheel 220.

  The engine 201 rotates a crankshaft 204 that is an output shaft thereof. A flywheel 202 is fixed to the crankshaft 204 of the engine 201. The flywheel 202 is an inertial force variable unit, and rotates with the rotation of the crankshaft 204 to suppress the rotational fluctuation of the drive shaft 216.

  MG1 and MG2 are synchronous motor generators, each of which includes a rotating shaft 221, 222, a rotor, and a stator. Rotors are fixed to the rotary shafts 221 and 222, respectively. A flywheel 202 is fixed to the rotating shaft 222. The MG1 and MG2 are connected to the power conversion means 230. The power conversion means 230 functions as an electric motor that rotates the rotating shafts 221 and 222 by supplying the electric power charged in the battery 240 to the MG1 or MG2. Further, MG1 and MG2 generate electromotive force when the respective rotating shafts 221 and 222 are rotated by external force. Therefore, the MG1 and MG2 function as a generator, and the generated electric power is charged in the battery 240, and the MG1 or MG2 It can also be supplied.

  Planetary gear 210 is power splitting means, and engine 201, MG1, and MG2 are mechanically coupled. The planetary gear 210 includes a main shaft 211, a sun gear 212, a pinion 213, a carrier 214, and a ring gear 215. One end of the main shaft 211 is connected to the crankshaft 204 via the damper 203, and the other end is connected to the carrier 214. The sun gear 212 is connected to the rotation shaft 221 of the MG 1, and the MG 1 is connected to the sun gear 212. The pinion 213 meshes with the sun gear 212, and a plurality of (for example, three) pinions are arranged around the pinion 213. Each pinion 213 is held by a carrier 214 that supports the sun gear 212 so as to revolve integrally therewith. The ring gear 215 meshes with each pinion 213 held by the carrier 214 and is formed on the drive shaft 216. One end of the drive shaft 216 is connected to a rotary shaft 222 of MG2, and MG2 is connected to the drive shaft 216, and a flywheel 220 is fixed to the rotary shaft 222.

  A chain drive sprocket 217 is fixed to the other end of the drive shaft 216, and a chain belt 250 is wound between the chain drive sprocket 217 and the speed reducer 260. The power output from at least one of the engine 201 or MG2 is transmitted to the axle 270 via the drive shaft 216, the chain belt 250, and the speed reducer 260, and is further transmitted to the wheels 280 mounted on the axle 270.

  According to the second embodiment, the electric motor according to the present invention can be applied to a hybrid vehicle, and the rotor of the electric motor can be moved using the flywheel mounted on the hybrid vehicle. This eliminates the need for field-weakening control during high-speed driving of the hybrid vehicle.

  The electric motor according to the present invention can be widely used for an electric motor having a rotor with a permanent magnet and requiring field-weakening control.

It is a schematic sectional drawing (low-speed rotation area | region) of the axial direction of the electric motor which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1 (configuration example of a first rotor portion). FIG. 2 is a cross-sectional view taken along the line B-B ′ of FIG. 1 (second rotor unit embodiment 1). FIG. 4 is a cross-sectional view taken along the line B-B ′ of FIG. 1 (second rotor unit embodiment 2). FIG. 6 is a cross-sectional view taken along the line B-B ′ of FIG. 1 (second rotor unit embodiment 3). It is a C-C 'arrow line view of FIG. It is a schematic sectional drawing (high-speed rotation area | region) of the axial direction of the electric motor which concerns on embodiment of this invention. FIG. 8 is a C-C ′ arrow view of FIG. 7. 1 is a schematic diagram of a parallel hybrid vehicle to which an electric motor according to an embodiment of the present invention is applied. 1 is a schematic diagram of a serial / parallel hybrid vehicle to which an electric motor according to an embodiment of the present invention is applied.

Explanation of symbols

1 Electric motor 10 Housing 20 Rotor (rotor)
20a 1st rotor part 20b 2nd rotor part 21 End face board 22 Flange 22a Separate part 22b Convex part 23 Electrical steel sheet (core)
24 permanent magnet 25 main body 26 secondary conductor rod 27 core 28 main body 29 salient pole 30 stator 31 stator main body 32 stator coil 40 rotating shaft 40a first rotating shaft 40b second rotating shaft 41 space 41a recessed portion 41b recessed portion 42a insertion hole 43 , 44 Bearing 45 Spacer 50 Spring 60 Flywheel 70 Weight 71 Wire 100 Hybrid vehicle 101 Engine 102 Flywheel 103 Motor generator (MG)
104 Transmission (TM)
105 Battery 106 Power Conversion Means 110 Crankshaft 111 Drive Shaft (Main Shaft)
112 Axle 113 Wheel 200 Hybrid vehicle 201 Engine 202 Flywheel 203 Damper 204 Crankshaft 210 Planetary gear 211 Main shaft 212 Sun gear 213 Pinion 214 Carrier 215 Ring gear 216 Drive shaft 217 Chain drive sprocket 220 Flywheel 230 Power conversion means 240 Battery 250 Chain belt 260 Machine 270 axle 280 wheels

Claims (7)

A stator,
A rotor including a first rotor portion using a permanent magnet and a second rotor portion not using the permanent magnet, which are arranged axially with respect to each other;
A rotating shaft that rotates in conjunction with the rotor;
A displacement mechanism for displacing an axial relative positional relationship between the stator and the rotor;
An electric motor comprising:   The displacement mechanism is configured such that the first rotor portion is opposed to the stator in a low-speed rotation region, and the second rotor portion is opposed to the stator in a high-speed rotation region. The electric motor according to claim 1, wherein the rotor is moved.   3. The electric motor according to claim 1, wherein the second rotor portion is configured by an induction rotor, a synchronous reluctance rotor, or a switched reluctance rotor.   The electric motor according to any one of claims 1 to 3, wherein the displacement mechanism moves the rotor in the axial direction using a centrifugal force according to a rotational speed. The displacement mechanism is
First urging means for urging the rotor in one of the axial directions;
Second biasing means for biasing the rotor in the other direction of the axial direction by utilizing a centrifugal force according to the rotational speed;
The electric motor according to claim 4, comprising: The second urging means is
A flywheel connected to the rotating shaft;
Weights provided on the flywheel and moving from the radially inner side to the radially outer side according to the centrifugal force,
A wire having one end fixed to the weight and the other end fixed to the rotor, and pulling the rotor in the other direction of the axial direction;
The electric motor according to claim 5, comprising:   A hybrid vehicle comprising the electric motor according to any one of claims 1 to 6.

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