JP2007259527A - Permanent magnet synchronous motor/generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet synchronous motor/generator in which counter electromotive voltage can be reduced during high rotary operation. <P>SOLUTION: In the permanent magnet synchronous motor/generator (20), the stator (23) has a double structure of concentric and circular inner stator (30) and outer stator (31) wherein slots (32) are formed in the inner circumferential surface of the outer stator while spaced apart equally in the circumferential direction and the armature winding (33) is placed in the slot. Furthermore, through holes (34) penetrating the inner and outer circumferential surfaces of the inner stator are formed in the inner stator at an interval substantially equal to that of the slots, and the outer rotor and the inner stator are arranged to rotate relatively in the circumferential direction of the rotating shaft. When the outer stator and the inner stator are rotated relatively in the circumferential direction of the rotating shaft, the passage area of flux between the rotor and the stator can be varied and the amount of flux linkage can be reduced by decreasing the passage area of flux in case of such a number of revolutions as possibly causing the problem of counter electromotive voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a permanent magnet synchronous motor / generator using a permanent magnet as a field.

  Permanent magnet synchronous motors / generators (hereinafter sometimes referred to as motors) have excellent maintainability, controllability, and environmental resistance, and are capable of high-efficiency and high-power operation by using powerful magnets. For this reason, it is widely used in the industry, and although not particularly limited thereto, for example, an application example to a hybrid vehicle as shown in Patent Document 1 below is known.

  A hybrid vehicle includes two engines, an engine and an electric motor, as drive sources. The electric motor is required to have high efficiency, high output, and compactness. In order to meet such a demand, it is effective to use a motor (permanent magnet synchronous motor / generator) using a strong permanent magnet as a field. However, a motor using such a strong permanent magnet as a field increases the back electromotive force generated in the motor in proportion to the increase in the number of revolutions, so the breakdown voltage of the inverter element and the stator winding must be increased. There is inconvenience that we do not get.

Here, when the counter electromotive voltage generated in the motor is E, E is given by the following equation (1).
E = k × ψ × n (1)
Here, k is a constant for each motor, n is the rotational speed, and ψ is the amount of flux linkage.

  In the above equation (1), the flux linkage ψ corresponds to the strength of the field. Therefore, when a strong permanent magnet is used for the field in order to increase the output, the value of the linkage flux amount ψ becomes large, and therefore the back electromotive force E is increased by the increase of the linkage flux amount ψ. Since it increases proportionally, the back electromotive force E in the maximum rotation operation region (maximum region of the rotation speed n) of the motor may exceed the breakdown voltage of the inverter element, the stator winding, and the like.

  Possible countermeasures include, for example, (a) lowering the maximum rotation operating range of the motor, (b) increasing the breakdown voltage of the inverter elements and the stator windings, etc. However, the countermeasure of (b) is a cause of cost increase for motors and inverters, so that any countermeasure is a fundamental solution. I don't get it.

  Therefore, a design that lowers the back electromotive force, specifically, a configuration in which the thickness of the winding is increased and the number of turns is reduced, and as a result, the design and manufacture of the motor / generator is required. Inconvenience that many of the above constraints are imposed is caused, and as will be described later, an inconvenience that the inverter capacity is increased is also caused.

  Therefore, in the following Patent Document 1, a rotor having a permanent magnet is divided into two parts in the direction of the rotation axis, and the relative positions of the N pole and S pole on the divided rotor are shifted in the circumferential direction. The mechanism is such that the flux linkage ψ can be adjusted.

  FIG. 5 is a structural diagram of the motor described in the document. In this figure, an armature winding 4 is wound around a slot 3 of a stator 2 of a motor 1, and this stator 2 is attached to a housing 6 in which a cooling water flow path 5 through which cooling water flows is formed. Shrink fit or press fit.

  The rotor 7 is accommodated on the inner peripheral surface side of the stator 2 with a slight gap. The rotor 7 is divided into two in the axial direction of the shaft 8 that is the rotation axis of the motor 1 (hereinafter referred to as a first rotor 7 a and a second rotor 7 b). Although fixed, the second rotor 7 b is attached so as to be movable along the shaft 8.

  A plurality of permanent magnets (see “N” and “S” in the figure) are embedded in the first rotor 7a and the second rotor 7b, respectively, and the magnetic poles of these permanent magnets are used as the first rotor. 7a and the second rotor 7b are alternately arranged along the rotation direction.

  Here, the inner diameter side of the second rotor 7b has a nut shape, and meshes with a bolt formed on the outer diameter side of the shaft 8 facing the inner diameter. That is, the relative rotation between the shaft 8 and the second rotor 7b causes the second rotor 7b to move along the shaft 8 in the horizontal direction of the drawing (that is, the rotation axis direction of the motor 1) and the direction around the axis (that is, the motor). 1 (circumferential direction of the rotating shaft 1).

  A stopper 9 is provided for restricting the movement of the second rotor 7b in the axial direction, and the position of the stopper 9 can be varied by the actuator 10.

  According to this, when the motor 1 is used as a generator and at the time of high rotation operation where the back electromotive voltage E can be a problem, the second rotor 7b is moved along the shaft 8 as shown in FIG. By shifting the relative positions of the N pole and S pole on the divided rotors (first rotor 7a and second rotor 7b) in the circumferential direction, the N pole magnetic flux and the S pole magnetic flux are canceled and chained. By reducing the amount of magnetic flux ψ, the counter electromotive voltage E during high-speed operation of the motor 1 is reduced to eliminate the inconvenience.

JP 2001-69609 A

The above prior art has the following problems.
FIG. 6 is a diagram for explaining the problems of the prior art. As shown in this figure, when the second rotor 7 b is moved along the shaft 8, a part of the second rotor 7 b slightly protrudes from the inner peripheral surface of the stator 2 to the outside. For this reason, the magnetic flux 11 from the 2nd rotor 7b to the iron core tooth part 2a in which the coil end (the folding | turning part of the armature winding 4) was formed will increase, and the iron core tooth part 2a will be localized by this magnetic flux 11 There is a problem that it is heated.

  Therefore, in the present invention, the permanent magnet synchronization in which the counter electromotive voltage E at the time of high rotation operation can be reduced without causing local heating of the iron core tooth portion by devising the fixed side member instead of the rotation side member. It is to provide a motor / generator.

The permanent magnet synchronous motor / generator according to claim 1, wherein the stator has a double structure of a concentric outer stator and an inner stator, and slots are formed at equal intervals in the circumferential direction on the inner peripheral surface of the outer stator. The armature winding is wound around the slot, and the outer stator and the inner stator are configured to be relatively rotatable in the direction around the rotation axis, and the inner stator has inner and outer peripheries. A through hole penetrating the surface is formed, and the through hole is configured to be positioned between adjacent slots by the relative rotation.
The permanent magnet synchronous motor / generator according to claim 2 is the permanent magnet synchronous motor / generator according to claim 1, comprising an actuator and control means for controlling the operation of the actuator, wherein the control means includes When the rotational speed of the rotor provided on the inner peripheral side of the inner stator or the command value of the rotational speed is in the high rotational speed range, the operation of the actuator is performed so that the through hole is positioned between adjacent slots. It is characterized by controlling.
The permanent magnet synchronous motor / generator according to claim 3 is the permanent magnet synchronous motor / generator according to claim 1 or 2, wherein one of the outer stator and the inner stator is rotated in the direction around the rotation axis. An actuator, and a control means for controlling the operation of the actuator, wherein the control means includes a rotation speed of a rotor provided on an inner peripheral side of the inner stator or a command value of the rotation speed in a low to middle rotation speed range. In this case, the operation of the actuator is controlled so that the positions of the slot and the through hole are aligned.
A permanent magnet synchronous motor / generator according to a fourth aspect is the permanent magnet synchronous motor / generator according to any one of the first to third aspects, wherein the through hole is filled with a nonmagnetic substance.

According to the first aspect of the present invention, since the configuration is as described above, by rotating the outer stator and the inner stator relative to each other in the direction around the rotation axis, the through hole is positioned between adjacent slots. The width of the magnetic path through which the magnetic flux of the permanent magnet passes can be changed. Therefore, when the rotational speed is high enough to cause a back electromotive voltage problem, the magnetic flux width ψ can be reduced by reducing the magnetic path width of the magnetic flux, and the problem can be solved.
In addition, a part of the magnetic flux emitted from the N pole of the rotor (see the magnetic flux 36a in FIG. 3C) directly enters the adjacent S pole through the inner stator, so that a so-called magnetic path short-circuit phenomenon occurs. Therefore, the amount of flux linkage ψ can be further reduced by the amount of the short-circuit magnetic flux, and the problem can be solved more reliably.
Further, according to the second and third aspects of the invention, since the configuration is as described above, the magnetic path width of the magnetic flux can be adaptively changed in accordance with the rotational speed of the permanent magnet synchronous motor / generator. For example, when the motor is in the low and middle speed range where there is no possibility of causing a back electromotive voltage problem, the amount of linkage flux ψ can be increased to improve the output and efficiency, while the back electromotive voltage problem occurs. When it is in a high rotational speed range where there is a possibility, the flux linkage ψ can be reduced so that the back electromotive force E does not exceed the withstand voltage of the inverter element, the stator winding or the like.
Moreover, according to the invention of claim 4, since it is configured as described above, the amount of interlinkage magnetic flux ψ is reduced by the filling material (nonmagnetic substance) in the through hole instead of the air in the through hole. be able to.

  Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the specific details or examples in the following description and the illustrations of numerical values, character strings, and other symbols are only for reference in order to clarify the idea of the present invention, and the present invention may be used in whole or in part. Obviously, the idea of the invention is not limited. In addition, a well-known technique, a well-known procedure, a well-known architecture, a well-known circuit configuration, and the like (hereinafter, “well-known matter”) are not described in detail, but this is also to simplify the description. Not all or part of the matter is intentionally excluded. Such well-known matters are known to those skilled in the art at the time of filing of the present invention, and are naturally included in the following description.

  FIG. 1 is a structural diagram of a permanent magnet synchronous motor / generator according to an embodiment, and FIG. 2 is an enlarged view of a main part of the permanent magnet synchronous motor / generator. In these drawings, a permanent magnet synchronous motor / generator (hereinafter referred to as a motor) 20 includes a cylindrical housing 22 in which cooling water passages 21 through which cooling water flows are formed at equal intervals, and an inner portion of the housing 22. A cylindrical stator 23 mounted on the peripheral side and a rotor 24 accommodated on the inner peripheral side of the stator 23 with a minute gap therebetween are configured.

  The rotor 24 is fixed to a shaft 25 that is a rotating shaft of the motor 20. A plurality of permanent magnets (four permanent magnets 26 to 29 in this example) are embedded in the rotor 24, and these permanent magnets 26 to 29 are N along the circumferential direction of the rotor 24. The poles and S poles are arranged alternately. In the figure, “N” represents the N pole, and “S” represents the S pole.

  Here, the stator 23 of the present embodiment has an inner and outer double concentric structure. That is, the stator 23 of the present embodiment includes an inner (side closer to the rotor 24) stator (hereinafter referred to as an inner stator) 30 and an outer (side closer to the housing 22) stator (hereinafter referred to as outer fixing). 31). Both the inner stator 30 and the outer stator 31 are made of a non-conductive magnetic material, typically a sintered core, a silicon steel plate, or the like.

  Slots 32 opened in the direction facing the inner stator 30 (inner peripheral surface side) are formed in the outer stator 31 at equal intervals in the circumferential direction, and an electric coil 33 is wound around the slots 32. ing. On the other hand, the inner stator 30 is formed with through holes 34 that penetrate the inner and outer peripheral surfaces of the inner stator 30 at equal intervals in the circumferential direction. Filled with conductive material. In addition, the said substance should just be a nonmagnetic thing, for example, does not exclude conductive things, such as aluminum.

  The arrangement period of the through holes 34 is the same as the arrangement period of the slots 32, and the opening width of the through holes 34 is set to be the same as or close to the opening width L (see FIG. 2) of the slot 32. .

  The inner stator 30 and the outer stator 31 can rotate around the axis of the motor 20 relatively. An arrow F in FIG. 2 indicates the relative rotational direction. For example, when the housing 22 and the outer stator 31 are fixed, the inner stator is aligned along the inner peripheral surface of the outer stator 31 on the fixed side. 30 can rotate in the circumferential direction, or when the housing 22 and the inner stator 30 are fixed, the outer stator 31 extends in the circumferential direction along the outer peripheral surface of the inner stator 30 on the fixed side. It can be rotated.

  One important point in the present embodiment is that the inner stator 30 and the outer stator 31 can relatively rotate around the axis of the motor 20. Hereinafter, for convenience of explanation, it is assumed that the housing 22 and the outer stator 31 are fixed. That is, it is assumed that the inner stator 30 can rotate in the circumferential direction (the direction of arrow F in FIG. 2) along the inner peripheral surface of the outer stator 31 on the fixed side.

  FIG. 3 is an enlarged view of a main part of the motor, and FIG. 3A is a state diagram in which the opening of the slot 32 of the outer stator 31 and the opening of the through hole 34 of the inner stator 30 are combined. (B), (c) is the state figure which shifted the opening of the slot 32 of the outer side stator 31, and the opening of the through-hole 34 of the inner side stator 30. FIG. In this figure, the code | symbol 30a has shown the inner side magnetic flux path | route, and the code | symbol 31a has shown the outer side iron core tooth part.

  First, the state of FIG. 3A will be described. In this state, the inner stator 30 and the outer stator 31 are relatively rotated around the axis of the motor 20 so that the openings of the slots 32 and the openings of the through holes 34 are aligned. Hereinafter, this state is referred to as a “slot match state”.

  In this slot match state, all of the outer iron core tooth portion 31a and the inner magnetic flux path portion 30a are aligned in the radial direction around the rotation axis (shaft 25) of the motor 20. For this reason, the magnetic flux (or the magnetic flux entering the outer peripheral surface of the rotor 24) 35 emitted from the outer peripheral surface of the rotor 24 is an iron core portion of the outer stator 31, that is, the outer core tooth portion 31a of the outer stator 31; It passes through the iron core portion of the inner stator 30, that is, the inner magnetic flux path portion 30a of the inner stator 30, and the area of these outer iron core tooth portion 31a and inner magnetic flux path portion 30a (area through which the magnetic flux 35 passes). Since it is the maximum, in this slot match state, the flux linkage ψ in the previous equation (1) can be maximized.

  Next, the states of FIGS. 3B and 3C will be described. In this state, the inner stator 30 and the outer stator 31 are rotated relative to each other around the axis of the motor 20, and the positions of the outer core teeth 31a and the inner magnetic flux path 30a are set in the circumferential direction (see FIG. 2). This is when shifted in the direction of arrow F). Hereinafter, this state is referred to as a “slot mismatch state”.

  In the slot mismatch state, all of the outer core tooth portion 31a of the outer stator 31 and the inner magnetic flux path portion 30a of the inner stator 30 are displaced from each other, specifically, the outer core teeth of the outer stator 31. The inner magnetic flux path portion 30a of the inner stator 30 is not located directly below the portion 31a. For this reason, as shown in (b), the magnetic flux (or the magnetic flux entering the outer peripheral surface of the rotor 24) 36 from the outer peripheral surface of the rotor 24 is the outer core tooth portion 31a excluding the slot 32 of the outer stator 31. And the narrow side path magnetic flux path portions 30b located on both sides of the inner magnetic flux path portion 30a of the inner stator 30, and the areas (magnetic flux 36) of these outer core teeth 31a and side path magnetic flux path portions 30b. (Passing area) corresponds to the side path magnetic flux path portion 30b having the smallest area, so that the passing area of the magnetic flux 36 is minimized.

  In addition, if the arrangement of the magnetic poles on the outer peripheral surface of the rotor 24 is an arrangement of “S”, “N”, and “S” as shown in FIG. A part (magnetic flux 36a) directly enters the adjacent S pole through the inner stator 30 and causes a so-called magnetic circuit short-circuit phenomenon. Therefore, the amount of the magnetic flux 36 is further increased by this short-circuit magnetic flux (magnetic flux 36a). Decrease.

  Therefore, in this slot mismatch state, the amount of flux linkage ψ in the previous equation (1) can be minimized, so that the counter electromotive voltage E during the high rotation operation of the motor 20 can be reduced. Thereby, for example, when applied to a hybrid vehicle, an increase in the back electromotive voltage during high rotation can be mitigated, and a withstand voltage problem such as an inverter element and a stator winding can be solved.

  Incidentally, in this embodiment, since the positional relationship in the axial direction between the stator 23 and the rotor 24 does not change at all, the inconvenience (local heating of the iron core tooth portion 2a) at the beginning does not occur.

  Next, an example of a mechanism that relatively rotates the inner stator 30 and the outer stator 31 around the axis of the motor 20 will be described.

  FIG. 4 is a conceptual diagram of the rotation mechanism of the inner stator 30. In this figure, one end side (the right end side in the drawing) of the inner stator 30 is slightly extended so as to protrude from the right end surfaces of the outer stator 31, the housing 22 and the rotor 24, and the periphery of the extended portion is A tooth surface 30c is formed along the direction. The tooth surface 30c meshes with a gear 37 arranged opposite to the gear surface 30c, and the gear 37 is rotated in the forward and reverse directions by an actuator 39 connected through a shaft 38. . Therefore, the inner stator 30 rotates forward and backward in the direction indicated by the arrow 40 by driving the actuator 39 and rotating the gear 37.

  Thus, when the inner stator 30 is rotated by the actuator 39 so that the amount of flux linkage ψ can be adjusted, for example, when applied to a hybrid vehicle, an increase in the back electromotive voltage during high rotation is alleviated. And the pressure | voltage resistant problems, such as an inverter element and a stator winding, can be solved. The ability to adjust the amount of flux linkage ψ, that is, the field adjustment, can reduce the capacity of the inverter as described below. In addition, the winding structure of the motor has a thinner line. Furthermore, it becomes possible to have a configuration in which the coil is wound many times, and the restrictions on design and manufacturing are eased.

  Motor design and manufacturing constraints mean that thick field windings need to be wound with a small number of turns because it must be designed to be used in a low voltage state if field adjustment is not possible. Using thick windings makes it harder to make (harder to handle, larger winding equipment, etc ...). If the number of windings is small, it is difficult to adjust by design, which is a limitation. For example, when the appropriate number of turns is about 100 and about 10 times, if the number of turns is 100, the number of turns can be adjusted by 1% in a ratio of 99 or 101. The number can be adjusted only by about 10% such as 9 or 11. Further, when the appropriate number of turns is twice, the adjustment is performed every 50% such as 1 or 3. That is, as the number of turns increases, the adjustment of the number of turns becomes easier, and design constraints are reduced.

  The capacity reduction of the inverter will be described. First, let us consider variable speed operation and idling operation as the motor use conditions. These conditions (variable speed driving and idling driving) correspond to driving conditions when applied to a hybrid vehicle, for example. In a hybrid vehicle, the number of rotations of the motor changes according to the vehicle speed, and when the rotation shaft of the motor is directly connected to a power source such as an engine, even if the motor is not operated, This is because the motor is idled and driven by the engine torque.

  The counter electromotive voltage E of the motor is given by the previous equation (1), but in the case of a permanent magnet type synchronous motor / generator, the flux linkage ψ in the above equation (1) is constant. This is because the permanent magnet type synchronous motor / generator cannot adjust the field unlike the wound type synchronous motor / generator.

  Therefore, according to the above equation (1), the back electromotive force E of the permanent magnet synchronous motor / generator increases and decreases in proportion to the rotational speed n under a constant linkage flux amount ψ.

  Now, the back electromotive force E must not exceed the withstand voltage of the inverter switching element and the synchronous motor / generator winding, which are peripheral control elements of the synchronous motor / generator. This is because the excessive back electromotive force E damages the switching element and the windings and causes failure.

  For this reason, normally, the maximum value (maximum number of rotations nmax) of the number of rotations n that can be used is determined, and the counter electromotive voltage at the time of nmax is a limit value (for example, the switching element of the inverter or winding of the synchronous motor / generator Design permanent magnet synchronous motor / generator so as not to exceed the withstand voltage of the wire. For example, in the case of a hybrid vehicle, nmax is set to 6000 rpm corresponding to the maximum vehicle speed in the specification, and the counter electromotive voltage when the rotational speed n of the permanent magnet synchronous motor / generator reaches 6000 rpm is the above limit. Design not to exceed the value.

  However, it is extremely rare to drive a hybrid vehicle at the maximum vehicle speed in the specification, and usually it is mostly operated in a region that is much lower than nmax, for example, about 0 to 3000 rpm (hereinafter, a normal region). Therefore, when the permanent magnet synchronous motor / generator is designed as described above, that is, when the counter electromotive voltage when nmax (6000 rpm) is reached is not exceeded the above limit value, However, it is necessary to operate a permanent magnet synchronous motor / generator with a very small voltage and a large current.

  In other words, “small voltage” and “large current” are generated in the low torque and large torque region, while “small or medium current” and “large voltage” are generated in the high output region of the high rotation and a large current is required. As a result, the rotational speed range and the rotational speed range where a large voltage is required are greatly different. For this reason, since the capacity of the inverter is proportional to the product of “voltage” and “current”, an inverter having a capacity larger than the actual output is required, which is uneconomical. Further, the winding of the motor needs to be thickened corresponding to a large current, which is uneconomical.

  However, according to the present invention, it is possible to adjust the amount of flux linkage ψ in the above equation (1), and it is possible to optimize the current and voltage in each rotation speed region, and the capacity of the inverter It is not necessary to make the motor winding smaller and thicker the winding of the motor, and the economy can be improved.

  As an extreme example, let us consider a case where the interlinkage magnetic flux amount ψ in the above equation (1) can be arbitrarily adjusted in the range of 50% to 100%.

  If the motor rotation speed range is 0 to 6000 rpm, it is originally designed so that the counter electromotive voltage becomes the upper limit voltage at the maximum rotation speed of 6000 rpm (first design example). Is designed to be the limit of the upper limit voltage (second design example).

  If it is necessary to output the maximum torque at 2000 rpm, the reverse constant voltage is doubled in the first design example and the second design example. Specifically, when the reverse constant voltage of the first design example is 100 V, the second design example has a counter electromotive voltage of 200 V, and eventually the voltage applied to the load also doubles (the first design example) In the case of 150V, the second design example is 300V).

  This is because the current required to obtain torque (the same output because the rotation speed is the same) is halved contrary to the voltage (when the first design example is 200 A, the second design example is 100 A). It is.

  On the other hand, at the maximum rotation speed of 6000 rpm, the back electromotive voltage of the second design example is 600 V, and the first design example is 300 V. This is the maximum voltage that can be applied in both the first design example and the second design example. If it is common, it means that it is necessary to perform field-weakening control greatly with respect to the first design example in the second design example.

  In the case of a synchronous machine, even if “back electromotive voltage> maximum voltage that can be applied”, operation is possible by field-weakening operation (of course, there is a limit to the range in which field-weakening is possible). Incidentally, the field weakening means that the terminal voltage is lowered by supplying a D-axis current (basically a current having a phase that does not contribute to torque). In the case of a large field weakening (the terminal voltage is greatly lowered with respect to the counter electromotive voltage), it is necessary to pass a large D-axis current. When the field is weakened, a wasteful current is required, and the absolute value of the current increases. The amount of current increase depends on how much field weakening is performed.

  However, there is no problem as long as the current of the second design example required at this operating point does not exceed the current at the maximum torque (here, it is assumed that the current does not exceed the current at the maximum torque).

  From the above, the inverter capacities required for the first design example and the second design example can be calculated as follows, respectively, and the inverter capacity of the second design example is reduced.

<First design example>
Current: 200A, Voltage: 300V
Inverter capacity = √3 × 200 × 300 ≒ 104kVA

<Second design example>
Current: 100A, Voltage: 300V
Inver evening capacity = √3 × 100 × 300 ≒ 52kVA

  In the case of idling (not energized), in the second design example, the back-EMF voltage can be prevented from exceeding the upper limit by reducing the flux linkage ψ in the above equation (1). .

  Thus, if the amount of flux linkage ψ in the above equation (l) can be adjusted, the inverter capacity can be reduced, and it is not necessary to increase the winding of the motor, thereby improving the economy.

It is a structural diagram of the permanent magnet synchronous motor / generator of the embodiment. It is a principal part enlarged view of a permanent magnet synchronous motor / generator. (A) is the state figure which match | combined the opening of the slot 32 of the outer side stator 31, and the opening of the through-hole 34 of the inner side stator 30, (b) and (c) are opening of the slot 32 of the outer side stator 31. 4 is a state diagram in which the opening of the through hole 34 of the inner stator 30 is shifted. 4 is a conceptual diagram of a rotation mechanism of an inner stator 30. FIG. 2 is a structural diagram of a motor described in Patent Document 1. FIG. It is a figure explaining the problem of a prior art.

Explanation of symbols

20 Motor (permanent magnet synchronous motor / generator)
23 Stator 24 Rotor 30 Inner Stator 31 Outer Stator 32 Slot 33 Armature Winding 34 Through-hole 39 Actuator Control Unit (Control Unit) of Actuator 42

Claims (4)

  The stator has a concentric outer stator and inner stator double structure, slots on the inner circumferential surface of the outer stator are formed at equal intervals in the circumferential direction, and armature windings are wound around the slots. The outer stator and the inner stator are configured to be relatively rotatable in a direction around a rotation axis, and a through hole is formed in the inner stator so as to penetrate the inner and outer peripheral surfaces of the inner stator. Is configured to be located between adjacent slots by the relative rotation.   An actuator for rotating one of the outer stator and the inner stator in the direction around the rotation axis; and a control means for controlling the operation of the actuator, the control means being arranged on the inner peripheral side of the inner stator. The operation of the actuator is controlled so that the through hole is positioned between adjacent slots when the rotational speed of the rotor provided or the command value of the rotational speed is in a high rotational speed range. Item 10. A permanent magnet synchronous motor / generator according to Item 1.   An actuator for rotating one of the outer stator and the inner stator in the direction around the rotation axis; and a control means for controlling the operation of the actuator, the control means being arranged on the inner peripheral side of the inner stator. The operation of the actuator is controlled so that the position of the slot and the through hole are aligned when the rotational speed of a rotor provided or a command value of the rotational speed is in a low / medium rotational speed range. Item 3. The permanent magnet synchronous motor / generator according to Item 1 or 2. 4. The permanent magnet synchronous motor / generator according to claim 1, wherein the through hole is filled with a nonmagnetic substance.

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