JP2007037213A - Switched reluctance motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switched reluctance motor 3 high in power generation efficiency. <P>SOLUTION: This switched reluctance motor is equipped with a field forming member 8 which is arranged adjacently in the direction of a rotating shaft X to the motor main body 7, at least at power generation. The magnetic field forming member 8 has a magnetic force generating part (permanent magnet 81) and a yoke part 82, and the yoke part 82 has a midsection 84 and a margin 85 which is symmetrical about its axis to the midsection 84 by being arranged in a position corresponding to at least each stator salient pole 73. At the time of drive, the coil 74 of each stator salient pole 73 is energized to form a magnetic field for rotor drive, while at the time of power generation, a magnetic field for power generation is formed by the magnetic field forming member 8 and the motor body 7, and power is generated by the coil 74 of each stator salient pole 73. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a switched reluctance motor.

For example, as disclosed in Patent Document 1, it is known to operate a switched reluctance motor having no permanent magnet in a rotor as a generator. Specifically, when the switched reluctance motor is operated as a generator, the supply of current to the coils of the stator salient poles is stopped at a predetermined timing. That is, in the coils of the stator, a field magnetic field is formed using some coils as field coils, and power is generated using other coils as power generation coils. In such a power generation method, as disclosed in Patent Document 1, the field coil is changed in the circumferential direction in synchronism with the rotation of the rotor, and the same coil is always arranged in the field without synchronizing with the rotation of the rotor. It is conceivable to use a magnetic coil.
JP 2001-25286 A

  However, since the power generation methods of the above-described two forms of switched reluctance motor are both configured such that the field coil and the power generation coil are arranged on the same plane orthogonal to the rotation axis, a closed loop is formed in the plane. A field magnetic field is formed. In this case, since the distance between the field coil and each power generating coil is not constant, the strength of the field magnetic field for each power generating coil is not uniform. As a result, a large amount of noise is included in the generated current obtained by each power generation coil, and the power generation efficiency decreases.

  The present invention has been made in view of this point, and an object of the present invention is to provide a switched reluctance motor having high power generation efficiency.

  The present invention provides a stator having a plurality of stator salient poles each provided with a coil and equally spaced in the circumferential direction, and a different number of the stator salient poles equally spaced in the circumferential direction. The present invention is directed to a switched reluctance motor including a motor body having a plurality of rotor salient poles and a rotor rotatable around a rotation axis.

  The switched reluctance motor further includes a field magnetic field forming member that is disposed close to the motor main body in the direction of the rotation axis and generates a field magnetic field for power generation with the motor main body at least during power generation, The field magnetic field forming member has a magnetic force generating part and a yoke part, and the yoke part is arranged at a position corresponding to each stator salient pole and a central part arranged on the rotating shaft. And a peripheral portion disposed axially symmetrically with respect to the central portion, and during driving, energizing the coils of the stator salient poles to form a field magnetic field for driving the rotor, During power generation, a field magnetic field for power generation is formed by the field magnetic field forming member and the motor body, and power is generated by the coils of the stator salient poles.

  According to this configuration, at the time of driving, similarly to the conventional switched reluctance motor, the coils of the stator salient poles are used as field coils, and the plurality of field coils are sequentially energized in the circumferential direction. As a result, the rotor is rotated (torque is generated).

  On the other hand, during power generation, a field magnetic field is formed by a motor main body and a field magnetic field forming member that is close to the motor main body in the direction of the rotation axis. Therefore, a stable field magnetic field that is radial (axisymmetric) about the rotation axis and closed loop in the direction of the rotation axis is formed. Thereby, the field magnetic field strength in the coils (power generation coils) of the stator salient poles arranged at equal intervals in the circumferential direction becomes uniform, the noise of the generated current is reduced, and the power generation efficiency is improved.

  The magnetic force generation unit includes a field coil disposed in the central portion, and the switched reluctance motor does not energize the field coil during driving, and energizes the field coil during power generation to energize the field magnetic field. A field magnetic field for power generation may be formed by the forming member and the motor body.

  By not energizing the field coil during driving, a field magnetic field is not formed by the motor main body and the field magnetic field forming member. Therefore, it becomes the structure similar to the conventional switched reluctance motor. On the other hand, at the time of power generation, by energizing the field coil, as described above, a field magnetic field is formed radially around the rotation axis and in the direction of the rotation axis.

  Also, unlike this, the magnetic force generation part is composed of a permanent magnet disposed in the central part, and the field magnetic field forming member is configured to be able to change a relative position with respect to the motor body on the rotation shaft. The switched reluctance motor arranges the field magnetic field forming member at a predetermined distance or more from the motor body when driven, and closes the field magnetic field forming member to the motor body during power generation. It is good also as forming the field magnetic field for electric power generation by the said field magnetic field formation member and the said motor main body by arrange | positioning.

  That is, at the time of driving, the field magnetic field forming member is not formed by the permanent magnet by separating the field magnetic field forming member from the motor body by a predetermined distance or more. That is, it becomes the structure similar to the conventional switched reluctance motor. On the other hand, at the time of power generation, the field magnetic field forming member is arranged close to the motor body, so that a permanent magnet forms a field magnetic field radially around the rotation axis and in the direction of the rotation axis. In this configuration, since it is not necessary to supply a current when forming a field magnetic field for power generation, the power generation efficiency can be further improved.

  Another switched reluctance motor of the present invention further includes a power generation coil holding member that is disposed in the vicinity of the rotation axis direction with respect to the motor body and forms a field magnetic field for power generation together with the motor body. The coil holding member includes a power generation coil and a yoke portion, and the yoke portion is disposed at a position corresponding to each of the stator salient poles, and a central portion disposed on the rotating shaft. And a peripheral portion arranged axially symmetrically with respect to the central portion, and during power generation, the field coil of each stator salient pole is energized to generate power by the power generation coil holding member and the motor body. A field magnetic field is formed, and power is generated by the power generating coil.

  According to this configuration, at the time of driving, similarly to the conventional switched reluctance motor, the coils of the stator salient poles are used as field coils, and the plurality of field coils are sequentially energized in the circumferential direction. This causes the rotor to rotate.

  On the other hand, during power generation, a field magnetic field is formed using the coils of the stator salient poles as field coils. The field magnetic field generated at this time is radial (axisymmetric) around the rotation axis and closed loop in the rotation axis direction, with a stable and uniform intensity in the circumferential direction, by the power generation coil holding member and the motor body. It becomes a field magnetic field. Thus, power generation is performed with high efficiency in the power generation coil.

  As described above, according to the switched reluctance motor of the present invention, the field magnetic field during power generation is radial (axisymmetric) around the rotation axis, closed loop in the rotation axis direction, and stable and circumferential strength. Since a uniform field field is formed, it is possible to reduce power generation current noise and improve power generation efficiency.

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

(Embodiment 1)
FIG. 1 shows the configuration of a drive system of an automobile equipped with a switched reluctance motor 3 according to Embodiment 1 of the present invention. This vehicle is a hybrid vehicle (hereinafter also referred to as HEV: Hybrid Electric Vehicle) that includes the engine 1 and the motor 3a as drive sources and travels by combining the engine 1 and the motor 3a. This hybrid vehicle is a so-called series-parallel hybrid vehicle. A crankshaft, which is an output shaft of the engine 1, is connected to a motor 3a and a generator 3b through a power split mechanism 4, and the motor 3a further includes a differential mechanism (differential). Gear) 61 is connected to drive wheel 6. Thus, in this HEV, the power generated by the engine 1 is appropriately divided and transmitted to the generator 3b and the drive wheels 6 (motor 3a) by the power split mechanism 4.

  An engine control computer (ECU) 5 is mounted on the HEV, and the engine 1, the motor 3a, and the generator 3b are controlled by the ECU 5.

  The engine 1 is a hydrogen engine 1 that generates driving force of a vehicle using hydrogen as a fuel. In the present embodiment, although not shown in the drawings, a saddle-shaped rotor housing having a trochoid inner peripheral surface and a side housing are provided. The hydrogen rotary engine 1 includes a substantially triangular rotor that is housed in an enclosed rotor housing chamber (cylinder) and supported so as to perform planetary rotational movement with respect to the crankshaft. In other words, the rotor rotates around the eccentric wheel of the crankshaft while the seal portions respectively disposed on the three tops of the outer periphery thereof are in contact with the trochoid inner peripheral surface of the rotor housing. It revolves around the shaft center, and while the rotor makes one rotation, the working chamber formed between the tops of the rotor moves in the circumferential direction, and intake, compression, expansion (combustion) And each process of exhaust is performed, and the rotational force generated by this is output from the crankshaft via the rotor.

  The hydrogen rotary engine 1 is of a two-rotor type in which two rotor housings are integrated so as to be sandwiched between three side housings, and the rotors are housed in two cylinders formed therebetween. In addition, two electronically controlled fuel injection valves 19 and 19 (injectors) for directly injecting fuel into the cylinder are provided for each cylinder. The hydrogen engine 1 is not limited to a rotary engine but may be a reciprocating engine.

  Each injector 19 is connected to a hydrogen fuel tank 40, and hydrogen as a fuel is supplied to each injector 19 from the hydrogen fuel tank 40. Here, the hydrogen fuel tank 40 in the present embodiment is a high-pressure container that stores gaseous hydrogen, and the high-pressure hydrogen gas is supplied to a predetermined pressure in the hydrogen fuel supply system between the hydrogen fuel tank 40 and each injector 19. A regulator 41 for reducing the pressure is interposed.

  The engine 1 is not limited to a hydrogen engine.

  The crankshaft of the rotary engine 1 is connected to two motor / generators 3 a and 3 b via a power split mechanism 4. Both of these motor generators 3a and 3b are adapted to switch functions between the electric motor and the generator depending on the situation. In a normal driving situation, the motor generator 3a is an auxiliary engine. The motor / generator 3b mainly plays a role as a generator that generates electric power using the power of the engine 1. Therefore, in the following description, the motor / generator 3a is called a motor (traveling motor), and the motor / generator 3b is called a generator. Each of the motor 3a and the generator 3b is a switched reluctance motor 3 in the present embodiment, and details of the configuration will be described later.

  The power split mechanism 4 is a planetary gear having a sun gear, a ring gear, and a planetary carrier. The sun gear is connected to the generator 3b, the ring gear is connected to the motor 3a, and the planetary carrier is connected to the rotary engine 1.

  The motor 3a and the generator 3b are connected to the battery 42 via the inverter 25.

  The ECU 5 is supplied with output signals of various sensors 24 and information on the amount of electricity stored in the battery 42. The ECU 5 determines the running state of the vehicle based on these output signals. In addition, the rotary engine 1, the motor 3a, and the generator 3b are controlled according to the traveling state. That is, the rotary engine 1 is controlled by controlling the fuel injection amount and ignition timing of each cylinder according to the running state, and the current flowing between the motor 3a and the battery 42 by the control of the inverter 25 and the generator The current flowing between 3b and the battery 42 is adjusted to control the output and rotation speed of the motor 3a, and the power generation amount and rotation speed of the generator 3b.

  Specifically, in a region where the rotation of the drive wheel 6 is low speed and high load and the operation efficiency of the rotary engine 1 is reduced, such as when starting or running at a low speed, the operation of the rotary engine 1 is stopped and the motor 3a is stopped. The drive wheel 6 is driven only by the power of On the other hand, during normal travel, the rotary engine 1 is operated and its power is transmitted to the drive wheels 6 via the power split mechanism 4, and the power is also transmitted to the generator 3 b via the power split mechanism 4. Done. The electric power generated by the generator 3b is supplied to the motor 3a, and the motor 3a is used as auxiliary power for the rotary engine 1. Depending on the running state during the normal running, the power generation amount of the generator 3b is decreased to reduce or stop the power assistance by the motor 3a, or the power generation amount of the generator 3b is increased to improve the power assistance by the motor 3a. To do.

  Thus, in this HEV, the rotary engine 1 is always operated in an efficient operation region by appropriately controlling the sharing of the two power sources of the rotary engine 1 and the motor 3a according to the situation. . The ECU 5 operates the rotary engine 1 even in a region where the operation of the rotary engine 1 is stopped, for example, when the charged amount of the battery 42 is insufficient or when the compressor of the air conditioner is driven. Yes.

  The ECU 5 also sets a required power generation amount for the generator 3b according to various input signal values, and causes the generator 3b to generate power according to the required power generation amount.

  Next, the configuration of the motor 3a and the generator 3b will be described with reference to FIGS. Each of the motor 3a and the generator 3b is a switched reluctance motor 3 as described above.

  The switched reluctance motor 3 includes a motor body 7 composed of a stator 71 and a rotor 75 arranged coaxially with each other, and a field magnetic field forming member 8 that forms a field magnetic field for power generation together with the motor body 7 during power generation. I have.

  The stator 71 includes a plurality of (eight in the illustrated example) stator salient poles 73 projecting inward in the radial direction inside a cylindrical yoke 72. The plurality of stator salient poles 73 are arranged at equal angular intervals, and each stator salient pole 73 is provided with a coil 74. The coil 74 is a set (same phase) in which coils 74 opposed in the radial direction across the rotation axis X are connected in series.

  The rotor 75 includes a plurality of (six in the illustrated example) rotor salient poles 76 that project outward in the radial direction on the outside of the disk-shaped core 78. The plurality of rotor salient poles 76 are arranged at equiangular intervals. The rotor 75 is externally fitted to a shaft 77 that is an output shaft, and rotates about the rotation axis X integrally with the shaft 77.

  The stator 71 and the rotor 75 are accommodated in a motor housing 79. The stator 71 is fixed in the motor housing 79, while the rotor 75 is supported by the motor housing 79 via the shaft 77 through a bearing 77a. As a result, it can be rotated around a rotation axis X that is coaxial with the central axis of the stator 71. The stator 71 and the rotor 75 are both made of a magnetic material.

  Here, reference numeral 61 is a terminal plate for pulling out the end of each coil 74 of the stator salient pole 73 to the outside of the motor housing 79, and reference numeral 62 is a rotation angle for detecting the rotation angle of the shaft 77. It is a sensor.

  The field magnetic field forming member 8 is disposed on one side of the rotation axis X direction with respect to the motor body 7 including the stator 71 and the rotor 75 with the shaft 77 penetrating. The shaft 77 is supported so as to reciprocate in the X direction.

  This field magnetic field forming member 8 has a permanent magnet 81 which is a magnetic force generating portion, and a yoke portion 82 formed of a magnetic material. The yoke portion 82 includes a disc-shaped main body portion 83 and the main body. A cylindrical central portion 84 that protrudes from the center position of the portion 83 toward the rotor 75 and has a through-hole through which the shaft 77 passes in the center, and from the periphery of the main body portion 83 toward the stator 71 side. And an annular peripheral edge 85 provided so as to protrude. That is, the annular peripheral edge portion 85 is disposed symmetrically with respect to the central portion 84 disposed on the rotation axis X.

  The permanent magnet 81 is attached to the tip of the central portion 84 (the end on the rotor 75 side).

  A plurality of engaging recesses 80 are formed on the outer peripheral surface of the field magnetic field forming member 8, and cams 86 attached to the motor housing 79 are engaged with the engaging recesses 80, respectively. It has become.

  Each cam 86 is swingably attached to the motor housing 79, and by swinging each cam 86, the field magnetic field forming member 8 is positioned closest to the motor body 7 and the motor body 7. The relative position with respect to the motor main body 7 on the rotation axis X can be linearly changed between the position and the most distant position. Each cam 86 is swung by an actuator (not shown), and the drive of the actuator is controlled by the ECU 5.

  Next, control of the switched reluctance motor 3 that is the motor 3a and the generator 3b will be described.

  When the switched reluctance motor 3 is driven (when used as an electric motor), the ECU 5 positions the field magnetic field forming member 8 at a position farthest from the motor body 7 ((a in FIG. 5). )reference). As a result, a field magnetic field is not formed in the motor body 7 by the permanent magnet 81 of the field magnetic field forming member 8. Note that the distance between the field magnetic field forming member 8 and the motor body 7 at this time may be set as appropriate as long as the field magnetic field is not formed by the permanent magnet 81.

  Then, similarly to the conventional switched reluctance motor 3, the energization of the coils 74 of the stator salient poles 73 is controlled based on the rotation angle detected by the rotation angle sensor 62. That is, by energizing the coils 74 of the pair of stator salient poles 73 that are opposed to each other in the radial direction, a magnetic flux is generated from the stator salient poles 73 toward the rotor salient poles 76 (a field magnetic field is formed). Torque is generated by attracting to the salient pole 73. When the stator salient poles 73 and the rotor salient poles 76 face each other, the other salient poles 73 and 76 are shifted from each other. For this reason, by energizing the coils 74 of the stator salient poles 73 that are sequentially shifted, the rotor salient poles 76 are continuously attracted to the stator salient poles 73, thereby causing the rotor 75 to rotate about the rotation axis X. Can be rotated around. That is, when the switched reluctance motor 3 is driven, the coil 74 of the stator salient pole 73 is caused to function as a field coil.

  When the switched reluctance motor 3 generates electric power (when used as a generator), the ECU 5 positions the field magnetic field forming member 8 at a position close to the motor body 7 ((b of FIG. 5). ) Or (c)).

  Thus, the motor main body 7 and the field magnetic field forming member 8 are radial (see the solid line or one-dot chain arrow) as shown in FIG. As shown, a field magnetic field that forms a closed loop (see solid line) in the direction of the rotation axis X is formed. In each stator salient pole 73, as shown in FIG. 6, the magnetic flux changes in a sine wave shape with the rotation of the rotor 75, whereby an electromotive force is generated in the coil 74 of each stator salient pole 73. That is, at the time of power generation by the switched reluctance motor 3, the coil 74 of the stator salient pole 73 is caused to function as a power generation coil.

  Further, at the time of power generation of the switched reluctance motor 3, the ECU 5 changes the relative position of the field magnetic field forming member 8 with respect to the motor body 7 in accordance with the set required power generation amount. This is performed based on, for example, a map as shown in FIG. 7. The larger the required power generation amount, the closer the distance between the motor body 7 and the field magnetic field forming member 8 is. The magnetic field forming member 8 is positioned closest to the motor body 7. By doing so, the larger the required power generation amount, the higher the field magnetic field strength for power generation (FIG. 5C). Conversely, the smaller the required power generation amount, the lower the power generation field magnetic field strength (FIG. 5). (B)). Thus, by changing the intensity of the field magnetic field according to the required power generation amount, power generation according to the required power generation amount can be efficiently performed, and overcharging of the battery 42 and the like are prevented.

  The magnetic flux changes in the stator salient poles 73 have different phases, so that the currents collected by the coils 74 have different phases, but the field magnetic field formed by the motor body 7 and the field magnetic field forming member 8 is different. Since the strength is uniform among the plurality of stator salient poles 73, a generated current with less noise can be obtained by combining the phases of the currents collected by the coils 74 together.

  As described above, the switched reluctance motor 3 of the present embodiment includes the field magnetic field forming member 8 for forming a field magnetic field for power generation, and is axially symmetric with respect to the rotation axis X by the field magnetic field forming member 8. In addition, a closed loop field magnetic field can be stably formed in the direction of the rotation axis X. Thus, since the field magnetic field strength of each stator salient pole 73 with respect to the coil 74 (that is, the power generation coil) is made uniform, a power generation current with less noise can be obtained, and power generation efficiency can be improved.

  Moreover, since the switched reluctance motor 3 forms a field magnetic field for power generation by the permanent magnet 81, no electric power is required for forming the field magnetic field, and the power recovery rate during power generation can be improved.

  Further, when the power generation is not required, the field magnetic field forming member 8 is positioned at the position farthest from the motor body 7 (see FIG. 5A), so that the field magnetic field by the permanent magnet 81 is not formed. Therefore, coupled with the fact that the rotor 75 does not have a permanent magnet, the switched reluctance motor 3 does not generate power when power generation is not required. Therefore, it is not necessary to provide a clutch for cutting off the power between the traveling motor 3a connected to the drive wheel 6 and its output shaft.

  In addition, in a motor having a permanent magnet in the rotor, the counter electromotive force becomes large at high rotation, and the coil may be damaged. Since magnetic saturation occurs due to the magnetic field generated by the energization, the driving force cannot be output during high rotation. However, since the reluctance motor 3 does not have a permanent magnet in the rotor and the back electromotive force does not increase, it is possible to drive the motor 3 even at high speeds. It is suitable as a traveling motor whose rotation speed is proportional.

  In the above embodiment, the permanent magnet 81 as the magnetic force generating portion is formed in an annular shape, but unlike this, for example, a plurality of permanent magnets corresponding to the stator salient poles 73 as shown in FIG. 87 may be disposed at the tip of the central portion 84. Further, as shown in FIG. 9, a disk-shaped permanent magnet 88 may be disposed at the tip of the central portion 84. However, in this case, the shaft 77 cannot be disposed through the field magnetic field forming member 8.

(Embodiment 2)
The second embodiment is different from the first embodiment in that the field magnetic field forming member 8 does not include the permanent magnet 81 as a magnetic force generation unit, but includes a field coil 89 instead.

  FIGS. 10 and 11 show the main part of the switched reluctance motor 3 according to the second embodiment. The switched reluctance motor 3 is provided with a field coil 89 at the central portion 84 of the field magnetic field forming member 8. ing. Unlike the field magnetic field forming member 8 of the first embodiment, the field magnetic field forming member 8 according to the second embodiment is configured not to reciprocate in the direction of the rotation axis, and at a position close to the motor body 7. Has been placed. Since the other configuration of the switched reluctance motor 3 of the second embodiment is the same as that of the switched reluctance motor 3 of the first embodiment, the same members are denoted by the same reference numerals, and detailed description thereof is omitted. .

  Next, control of the switched reluctance motor 3 according to the second embodiment will be described. Here, energization control to the field coil 89 of the field magnetic field forming member 8 is performed by the ECU 5 via the inverter 25.

  When the switched reluctance motor 3 is driven (when used as an electric motor), the field coil 89 is not energized, so that the motor body 7 is powered by the field coil 89 of the field magnetic field forming member 8. Field magnetic field is not formed.

  As in the conventional switched reluctance motor 3, the energization of the coils 74 of the stator salient poles 73 is controlled based on the rotation angle detected by the rotation angle sensor 62. Rotate around X. That is, also in the switched reluctance motor 3 according to the second embodiment, the coil 74 of the stator salient pole 73 is caused to function as a field coil when driven.

  During power generation of the switched reluctance motor 3 (when used as a generator), the field coil 89 of the field magnetic field forming member 8 is energized, whereby the motor body 7 and the field magnetic field forming member 8 A field magnetic field that is radial about the rotation axis X and that forms a closed loop in the direction of the rotation axis X is formed. Then, as described above, the coil 74 of each stator salient pole 73 is caused to function as a power generation coil (see the solid line and the alternate long and short dash line in FIGS. 10 and 11).

  Further, when the switched reluctance motor 3 generates power, the energization amount to the field coil 89 is changed based on the set required power generation amount. This is performed based on a map as shown in FIG. 12, for example, and the energization amount is increased as the required power generation amount is increased. By doing this, the strength of the field magnetic field for power generation increases as the required power generation amount increases, and conversely, the strength of the field magnetic field for power generation decreases as the required power generation amount decreases. Power generation can be performed efficiently.

  As described above, the switched reluctance motor 3 according to this embodiment also stably forms a field magnetic field that is axially symmetric with respect to the rotation axis X by the field magnetic field forming member 8 and also uses the field magnetic field for each stator salient pole 73 coil 74. The strength can be made uniform and the power generation efficiency can be improved.

  Further, when power generation is not required, a field magnetic field is not formed by not energizing the field coil 89 of the field magnetic field forming member 8, so that power generation is not performed when power generation is not required.

(Embodiment 3)
The third embodiment has the same configuration as that of the second embodiment, but differs from the second embodiment in that the field coil 89 of the field magnetic field forming member 8 in the second embodiment is a power generation coil 90.

  That is, as shown in FIGS. 13 and 14, the switched reluctance motor 3 according to the third embodiment has a field magnetic field forming member 8 (referred to as a power generation coil holding member 8 in the present embodiment, but the configuration is the field magnetic field forming member). The power generation coil 90 is provided in the central portion 84 of the same as in FIG. The power generation coil holding member 8 according to the third embodiment is not reciprocated in the direction of the rotation axis X like the field magnetic field forming member 8 of the second embodiment, and is in a position close to the motor body 7. Has been placed. Since the other configuration of the switched reluctance motor 3 of the third embodiment is the same as that of the switched reluctance motor 3 of the first and second embodiments, the same members are denoted by the same reference numerals, and the detailed description thereof is as follows. Omitted.

  Next, control of the switched reluctance motor 3 according to the third embodiment will be described.

  When the switched reluctance motor 3 is driven (when used as an electric motor), the energization of the coils 74 of the stator salient poles 73 is controlled based on the rotation angle detected by the rotation angle sensor 62, whereby the rotor 75 is rotated around the rotation axis X. That is, also in the switched reluctance motor 3 of the third embodiment, the coil 74 of the stator salient pole 73 is caused to function as a field coil when driven.

  In the switched reluctance motor 3 according to the third embodiment, the coils 74 of the stator salient poles 73 are energized during power generation (when used as a power generator), thereby the motor body 7 and the power generation coil holding member. 8 generates a field magnetic field for power generation. At this time, the energization of the coils 74 of the stator salient poles 73 is kept energized for all the coils 74.

  As a result, a field magnetic field is formed radially around the rotation axis X as shown in FIG. 13 and closed in the direction of the rotation axis X as shown in FIG. 14, and the field magnetic field corresponding to each stator salient pole 73 is formed. Changes sinusoidally with respect to the rotation angle of the rotor 75. As a result, an electromotive force is generated in the power generation coil 90 disposed in the central portion 84 of the power generation coil holding member 8.

  Further, when the switched reluctance motor 3 generates power, the energization amount to the coil 74 of each stator salient pole 73 is changed based on the set required power generation amount. Similarly to the second embodiment, this is performed based on a map as shown in FIG. 12, and the energization amount is increased as the required power generation amount is increased. Accordingly, the field magnetic field for power generation is increased as the required power generation amount is increased. On the contrary, the smaller the required power generation amount, the lower the strength of the field magnetic field for power generation. As a result, it is possible to efficiently generate power according to the required power generation amount.

  As described above, the switched reluctance motor 3 according to this embodiment can form a field magnetic field that is axisymmetric with respect to the rotation axis X with the power generation coil holding member 8 stably and with uniform intensity in the circumferential direction. The power generation efficiency by the coil 90 can be improved.

  In addition, since there is one power generation coil 90, it is possible to save the trouble of synthesizing the electromotive force generated in each coil 74 as in the first and second embodiments.

  Further, when power generation is not required, a field magnetic field is not formed by not energizing the coils 74 of the stator salient poles 73. Therefore, power generation is not performed when power generation is not required.

  In the above embodiment, the field magnetic field forming member 8 and the yoke portion 82 of the power generation coil holding member 8 are provided with the disk-shaped main body portion 83 and the annular peripheral edge portion 85. Instead, for example, as shown in FIG. 15, in the disk-shaped main body portion and the cylindrical peripheral portion, only the portions 85 corresponding to the stator salient poles 73 are left and the other portions are thinned. You may form in a basket shape. As a result, the weight of the switched reluctance motor 3 can be reduced. Alternatively, the disk-shaped main body may be left as it is, and only the portion corresponding to each stator salient pole 73 may be left in the cylindrical peripheral portion, and the other portions may be thinned.

  Further, the vehicle on which the switched reluctance motor 3 according to the present invention is mounted is not limited to a hybrid vehicle, and can be applied as a traveling motor for an electric vehicle, a fuel cell vehicle, and the like.

  Furthermore, the switched reluctance motor 3 according to the present invention is not limited to being applied to a traveling motor, but can also be used as a motor / generator mounted on a vehicle such as a starter / generator. Furthermore, the switched reluctance motor 3 of the present invention is not limited to a motor mounted on an automobile, but can be widely applied as a motor used as a motor generator.

  As described above, the present invention forms a field magnetic field that is radial (axisymmetric) around the rotation axis, closed loop in the rotation axis direction, and stable and uniform in strength in the circumferential direction during power generation. Since power generation efficiency can be improved, it can be widely used as a switched reluctance motor used as a motor / generator.

It is a block diagram which shows the structure of the drive system of the hybrid vehicle which concerns on embodiment of this invention. 1 is a longitudinal sectional view of a switched reluctance motor according to Embodiment 1. FIG. It is a top view which shows the principal part of the same switched reluctance motor. It is a perspective view which shows the field magnetic field formation member of the switched reluctance motor. In the same switched reluctance motor, it is explanatory drawing which shows the change of the relative position of a field magnetic field formation member and a motor main body. It is a figure explaining the magnetic flux change in each stator salient pole of the switch reluctance motor. It is an example of the control map which shows the relationship of the distance of a motor main body and a field magnetic field formation member with respect to required electric power generation amount. 6 is a plan view showing a field magnetic field forming member according to a modification of the first embodiment. FIG. It is a top view which shows the field magnetic field formation member which concerns on another modification. 6 is a plan view showing a main part of a switched reluctance motor according to Embodiment 2. FIG. It is AA sectional drawing of FIG. It is an example of the control map which shows the relationship of the energization amount to the field coil with respect to required electric power generation amount. FIG. 6 is a plan view showing a main part of a switched reluctance motor according to a third embodiment. It is BB sectional drawing of FIG. It is a perspective view which shows the yoke part of the field magnetic field formation member which concerns on other embodiment.

Explanation of symbols

3 switched reluctance motor 7 motor body 71 stator 73 stator salient pole 74 coil 75 rotor 76 rotor salient pole 8 field magnetic field forming member, power generation coil holding members 81, 87, 88 permanent magnet (magnetic force generating part)
89 Field coil (Magnetic force generator)
82 Yoke part 84 Center part 85 Peripheral part 90 Power generation coil X Rotating shaft

Claims (4)

A stator having a plurality of stator salient poles each provided with a coil and arranged at equal intervals in the circumferential direction, and a plurality of rotors different in number from the stator salient poles arranged at equal intervals in the circumferential direction A switched reluctance motor having a motor body including a salient pole and a rotor rotatable around a rotation axis,
At least at the time of power generation, further comprising a field magnetic field forming member that is disposed close to the motor main body in the direction of the rotation axis and forms a field magnetic field for power generation together with the motor main body,
The field magnetic field forming member has a magnetic force generation part and a yoke part,
The yoke portion is disposed at a central portion disposed on the rotation shaft, and at least a peripheral portion disposed axially symmetrically with respect to the central portion by being disposed at a position corresponding to each stator salient pole. Have
At the time of driving, the stator salient pole coils are energized to form a rotor driving field magnetic field, while at the time of power generation, the field magnetic field forming member and the motor body form a power generating field magnetic field, A switched reluctance motor that generates electricity with a salient coil. The switched reluctance motor according to claim 1,
The magnetic force generating part is composed of a field coil arranged in the central part,
A switched reluctance motor that does not energize the field coil during driving and energizes the field coil during power generation to form a field magnetic field for power generation by the field magnetic field forming member and the motor body. The switched reluctance motor according to claim 1,
The magnetic force generation part is composed of a permanent magnet disposed in the central part,
The field magnetic field forming member is configured to be able to change a relative position with respect to the motor body on the rotating shaft,
At the time of driving, the field magnetic field forming member is arranged at a predetermined distance or more away from the motor main body, while at the time of power generation, the field magnetic field forming member is arranged close to the motor main body to arrange the field magnetic field forming member. A switched reluctance motor that forms a field magnetic field for power generation by the motor body. A stator having a plurality of stator salient poles each provided with a field coil and equally spaced in the circumferential direction, and a plurality of different numbers of stator salient poles equally spaced in the circumferential direction A reluctance motor having a motor body comprising a rotor salient pole and a rotor rotatable about a rotation axis,
A power generation coil holding member that is disposed in the vicinity of the rotation axis direction with respect to the motor body and that forms a field magnetic field for power generation together with the motor body;
The power generation coil holding member has a power generation coil and a yoke part,
The yoke portion is disposed at a central portion disposed on the rotation shaft, and at least a peripheral portion disposed axially symmetrically with respect to the central portion by being disposed at a position corresponding to each stator salient pole. Have
A switched reluctance motor that generates electric field by generating electricity with the electric power generation coil holding member and the motor body by energizing the field coil of each stator salient pole during electric power generation.

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