WO2022003866A1

WO2022003866A1 - Rotating electrical machine and electric vehicle

Info

Publication number: WO2022003866A1
Application number: PCT/JP2020/025828
Authority: WO
Inventors: 学白木; 隆古畑; 幸夫津田
Original assignee: コアレスモータ株式会社
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2022-01-06
Also published as: JPWO2022003996A1; WO2022003996A1

Abstract

[Problem] To provide a rotating electrical machine that can achieve heightened responsiveness during switchover of a characteristic property, while maintaining predetermined torque even at high rotational speeds. [Solution] Provided is a coreless rotating electrical machine comprising: a housing 12; a rotational shaft 14 that is rotatably supported on the housing 12; an operating coil 18 which constitutes a cylindrical form and one end face of which is supported on a stator; and a rotor 16 which constitutes a cylindrical form, one end face of which is supported on the rotating shaft 14, and which is provided with a permanent magnet 16a on a surface facing the operating coil 18. The electrical machine is characterized in that the operating coil 18 is provided with circuit units 20 (20U, 20V, 20W) that comprise three phases U, V, and W, with each phase being constituted by a plurality of coils, and that enable the connection scheme of the coils constituting each phase to be switched over to either a series scheme or a parallel scheme.

Description

Rotating electric machines and electric vehicles

The present invention relates to a rotary electric machine, and particularly relates to a rotary electric machine suitable for performing efficient operation, and an electric vehicle using the same.

As a technique for changing the characteristics of a motor as a rotary electric machine, it has been proposed to switch the connection form of the internal winding as disclosed in Patent Document 1 and Patent Document 2. For example, Patent Document 1 is a technique relating to a motor for a machine tool, in which a coil composed of three phases is used as a stator, and a coil constituting each layer is composed of a plurality of coils having different winding times. Then, one to a plurality of coils are selectively connected in series so that the number of turns of the entire coil is reduced during high-speed rotation and the number of turns of the entire coil is increased during low-speed rotation.

Further, Patent Document 2 mainly discloses a technique relating to a motor for an electric tool or a starter generator for an automobile. Similar to the motor disclosed in Patent Document 1, the motor disclosed in Patent Document 2 also uses a coil composed of three phases as a stator. Each layer is composed of a plurality of coils, and a switch device capable of switching the connection of the plurality of coils constituting each layer in series or in parallel is provided. With such a configuration, in the series connection, the magnetic field excited by the coil becomes stronger and the torque can be improved, and in the parallel connection, the magnetic field becomes weaker, so that high-speed rotation can be realized.

Japanese Patent No. 3596711 Special Table 2010-537621 Gazette

According to the techniques disclosed in Patent Documents 1 and 2, it is considered possible to certainly change the characteristics of the motor and realize the operation of a plurality of motors with one motor.

However, in the technique disclosed in Patent Document 1, since the number of turns of the coil is substantially changed, there is a possibility that the torque will be extremely reduced in the high rotation speed range. Further, the technique disclosed in Patent Document 2 has a large self-inductance due to the influence of the iron core, and there is a concern that a time lag may occur between switching and characteristic change.

Therefore, the present invention provides a rotary electric machine capable of solving the above-mentioned problems and improving the responsiveness at the time of characteristic switching while maintaining a predetermined torque even at high rotation speed, and an electric vehicle using the same. With the goal.

The rotating electric machine according to the present invention for achieving the above object includes a housing, a rotating shaft rotatably supported by the housing, a non-rotating operating coil arranged around the rotating shaft, and the operation. A coreless rotary electric machine having a rotor with a magnet located on the opposite surface of the working coil separated from the coil, wherein the working coil is composed of three phases U, V, and W, each of which has a plurality of layers. It is characterized by having a circuit unit which is composed of the coils of the above and can switch the connection type of the coils constituting each layer to either a series type or a parallel type.

Further, in a rotary electric machine having the above-mentioned characteristics, it is preferable that the operating coil has a cylindrical shape. With such a configuration, it is possible to provide a gap in the internal space of the motor. Therefore, it is possible to effectively utilize the internal space of the motor.

Further, in a rotary electric machine having the above-mentioned characteristics, the circuit unit may be provided between the coils constituting the poles, and the circuit unit may be switched in units of the corresponding poles of each layer. .. With such characteristics, the number of switchable systems (characteristics) can be increased according to the number of coils and the number of circuit units.

Further, in a rotary electric machine having the above-mentioned characteristics, the number of coils connected in series on the low rotation side should be increased, and the number of coils connected in parallel on the high rotation side should be increased with respect to a predetermined threshold of rotation speed. It is preferable to provide a control unit for switching the circuit unit. By having such a feature, it is possible to balance the power consumption and the generated torque, and it is possible to widen the range of usable rotation range.

Further, in a rotary electric machine having the above-mentioned characteristics, the coil may be configured by using a litz wire. By having such a feature, it is possible to obtain strength for maintaining the shape of the working coil, and it is not necessary to use an iron plate or a copper plate for the working coil, so that self-inductance can be reduced.

Further, the electric vehicle for achieving the above-mentioned purpose is characterized in that the rotary electric machine having the above-mentioned characteristics is applied to the power for propulsion.

According to the rotary electric machine having the above-mentioned characteristics, it is possible to improve the responsiveness at the time of characteristic switching while maintaining a predetermined torque even at the time of high rotation.

It is a figure which shows the circuit structure of the operating coil in the motor which concerns on 1st Embodiment, and is the figure which shows the example of the case where the coil constituting each phase is connected in series. It is a figure which shows the circuit structure of the actuating coil in the motor which concerns on 1st Embodiment, and is the figure which shows the example of the case where the coil constituting each phase is connected in parallel. It is a side sectional view which shows the schematic structure of the motor which concerns on this invention. It is a figure which shows the cross-sectional structure of the actuating coil. It is a figure which shows the cross-sectional structure of the litz wire which constitutes the actuating coil which concerns on embodiment. It is a graph which shows the relational characteristic about each of torque and rotation speed, torque and current when the connection method of the coil constituting an actuating coil is switched. It is a graph which shows the characteristic change at the time of operating a motor by switching the connection method of the coil which constitutes an actuating coil. It is a graph which shows the change of the output characteristic at the time of operating a motor by switching the connection method of the coil constituting an actuating coil, and the zone for switching according to a situation. It is a figure which shows the circuit structure of the operating coil in the motor which concerns on 2nd Embodiment, and is the figure which shows the example of the case where all four coils constituting each phase are directly connected. It is a figure which shows the circuit structure of the operating coil in the motor which concerns on 2nd Embodiment, and is the case where 2 of 4 coils constituting each phase are connected in series, and the coil which forms the set which connected in series is connected in parallel. It is a figure which shows the example of. It is a figure which shows the circuit structure of the operating coil in the motor which concerns on 2nd Embodiment, and is the figure which shows the example of the case where all four coils constituting each phase are connected in parallel. It is a graph which shows the characteristic change at the time of operating a motor by switching the connection method of the coil constituting the working coil in the motor which concerns on 2nd Embodiment. It is a figure which shows the application form which provided 12 coils in one phase, and 5 circuit parts. It is sectional drawing which shows the example of the arrangement form of the coil in the case of using 12 coils.

Hereinafter, embodiments of the rotary electric machine and the electric vehicle of the present invention will be described in detail with reference to the drawings. The embodiment shown below will be described by taking a motor as an example as a rotary electric machine.

[Basic configuration]
First, the basic configuration of the motor 10 according to the present embodiment will be described with reference to FIGS. 3 to 5. The motor 10 according to the present embodiment is a so-called coreless motor that is basically composed of a housing 12, a rotating shaft 14, an operating coil 18, and a rotor 16. The housing 12 is an element constituting the outer shell, and houses the rotating shaft 14, the operating coil 18, and the rotor 16 in the internal space. The rotating shaft 14 is arranged so as to penetrate the housing 12, and is rotatably supported by a bearing 12a provided at an intersection with the housing 12.

The operating coil 18 is configured to form a cylindrical shape by a coil group divided into a plurality of phases (three phases of U phase, V phase, and W phase in this embodiment). The U-phase, V-phase, and W-phase constituting the operating coil 18 are composed of a plurality of coils each constituting a pole. In the embodiment shown in FIG. 4, each phase is divided into 1/2 (that is, divided into two equal parts), and the first coil U ₁ , the second coil U ₂ , the first coil V ₁ , the second coil V ₂ , and the first coil are divided. It is configured to consist of W ₁ and a second coil W _2. As a more specific example, the phase constituting the inner cylindrical coil body is the U phase, the phase located outside the inner cylindrical coil body in the radial direction is the V phase, and the phase located outside the V phase. Is the W phase, and the first coil (U ₁ , V ₁ , W ₁ ) and the second coil (U ₂ , V ₂ , W ₂ ) are defined for each phase. It should be noted that the U phase, the V phase, and the W phase from the inside are an example, and different orders and overlapping methods may be used. Further, in FIG. 4, each phase is sequentially arranged so as to be displaced in the circumferential direction by approximately 1/3. The actuating coil 18 having such a configuration is configured such that one end surface is supported by a stator (housing 12 in the example shown in FIG. 3) which is a fixing member.

Further, the rotor 16 has a cylindrical outer yoke 16c, an inner yoke 16b, and a permanent magnet 16a, and one end surface thereof is connected to the rotating shaft 14. The outer yoke 16c is an element located on the outer peripheral side of the working coil 18 (the outer peripheral side in the radial direction with respect to the center of the cylinder), and the inner yoke 16b is an element located on the inner peripheral side of the working coil 18. Further, in the motor 10 according to the present embodiment, the permanent magnet 16a is configured to be provided inside the outer yoke 16c and on the facing surface of the operating coil 18.

Since the power generation source and the rotating shaft 14 are separated from each other in the coreless motor having such a configuration, it is possible to obtain a large output and torque compared to the size of the motor. Further, since the operating coil 18 does not have an iron core, the self-inductance can be suppressed to a small value.

Further, in the motor 10 having such a configuration, when the operating coil 18 is configured, a litz wire as shown in FIG. 5 is used for the winding, and the shape is formed by coating with an insulating layer. The litz wire is a so-called stranded wire formed by bundling a plurality of conductive wires 18a, and the outer circumference of each conductive wire 18a is covered with an enamel layer 18b. Further, an outer skin layer 18c made of a fibrous material such as glass fiber is provided on the outer periphery of the conductive wire 18a (conductive wire 18a as a bundle) constituting the stranded wire.

Even with such a configuration, it is possible to suppress the generation of eddy current (eddy current loss) due to the use of an iron plate or a copper plate for maintaining the shape, and contribute to the reduction of self-inductance.

[First Embodiment]
In the motor 10 having such a basic configuration, as shown in FIGS. 1 and 2, each phase constituting the operating coil 18 is divided into two coils (first coil U ₁ , second coil U ₂ , first coil V). ₁ , 2nd coil V ₂ , 1st coil W ₁ , 2nd coil W ₂ ), and each coil is a pole. That is, the operating coil 18 according to the present embodiment is configured to form a three-phase, six-pole body. A changeover switch between the coils constituting each pole (first coil U ₁ and second coil U ₂ , first coil V ₁ and second coil V ₂ , first coil W ₁ and second coil W _2). The circuit unit 20 (20U, 20V, 20W) constituting the above is provided.

The circuit unit 20 is configured by arranging two changeover switches (first switch A and second switch B) of one input side port and two output side ports in parallel. _{The first coil U 1} , V ₁ , and W ₁ are connected to the input side port of the first switch A, respectively, and the first bypass line is connected to the input side port of the second switch B. _{The second coils U 2} , V ₂ , and W ₂ are connected to the output side port of the first switch A on the a port side, and the second bypass line is connected to the b port side. Further, the a port side is open (not connected) to the output side port of the second switch B, and the branch lines from _{the second coils U 2} , V ₂ , and W _{2 are connected to the b port side.} ing.

With such a circuit configuration, the first coil U ₁ , V ₁ , W ₁ and the second coil U ₂ , V ₂ , W ₂ are connected in series or by switching the switch constituting the circuit unit 20. It is possible to switch to parallel connection. Specifically, when both the first switch A and the second switch B are connected to the a port, the first coil U ₁ , V ₁ , W ₁ and the second coil U ₂ , V ₂ , W ₂ are connected in series. (See Fig. 1). On the other hand, when both the first switch A and the second switch B are connected to the b port, the first coil U ₁ , V ₁ , W ₁ and the second coil U ₂ , V ₂ , W ₂ are connected in parallel ( See Figure 2). That is, the switching timings of the first switch A and the second switch B are configured to match.

In such switching control, the torque characteristics are good in a system (referred to as the first system) in which _{the first coil U 1} , V ₁ , W ₁ and the second coil U ₂ , V ₂ , W _{2 are connected in series.} .. On the other hand, in _{a system (referred to as a second system) in which the first coil U 1} , V ₁ , W ₁ and the second coil U ₂ , V ₂ , W ₂ are connected in parallel, the rotational characteristics are good.

FIG. 6 shows the relationship characteristic between the torque and the rotation speed of the first system and the second system (TN characteristic) and the relationship characteristic between the torque and the current (TI characteristic), respectively. Comparing the second system and the first system, it can be read that the rising gradient of the used power due to the improvement of the torque is steep because the normal rotation range is high in the second system. On the other hand, in the first system, although it is possible to generate a high torque in the low rotation speed range, it can be read that the maximum rotation speed is only about half that of the second system.

Based on the characteristics of each system, it is considered that the good points of each of the two motors can be effectively utilized by using the first system in the low rotation range and the second system in the high rotation range. FIG. 7 shows the characteristics (TN characteristics and TI characteristics) of the motor obtained when the first system and the second system are switched in a rotation range where the maximum torque is 1/2. In the motor 10 according to the present embodiment in which the system is switched, it is possible to generate high torque while suppressing power consumption (current) in a low rotation speed region. In addition, in the part where there is no problem in operating with low torque, it is possible to realize a high rotation speed that cannot be obtained by the first system.

In order to realize such a configuration, the switches (first switch A and second switch B) constituting the circuit unit 20 need to be switched simultaneously in the three phases of the U phase, the V phase, and the W phase. .. Therefore, the motor 10 according to the embodiment is provided with a control unit 22 that outputs a switching signal to the circuit unit 20. The control unit 22 uses a predetermined threshold value of the rotation speed as a reference, increases the number of coils connected in series in each phase on the rotation speed side lower than the threshold value, and increases the number of coils connected in parallel on the high rotation speed side. It is good to have a configuration that switches like this. This is because the power consumption and the generated torque can be balanced and the usable rotation range can be widened.

When the motor 10 having such a configuration is applied to the power of the vehicle to form an electric vehicle, the output characteristics of the first system (series) and the second system (parallel) show the tendency as shown in FIG. Become. Therefore, from the viewpoint of generated torque, required rotation range, and power consumption, the system can be divided into three zones for operation while switching the system.

That is, the first zone should be applied when output torque is required (generally 1/2 or more of the maximum torque) such as when starting or climbing a slope (first system: at low rpm). In addition, the second zone has a relatively low rotation speed, does not require output torque (generally less than 1/2 of the maximum torque), and should be applied when it is desired to reduce power consumption (for example, during normal driving) (first system). : At high rpm). Further, the third zone should be applied when a high rotation speed is required and output torque is not required (generally less than 1/2 of the maximum torque) such as when traveling at high speed (second system: at high rotation speed).

[effect]
According to the motor 10 having the above-mentioned characteristics, as the power consumption is improved, a predetermined torque (first coil U ₁ , V ₁ , W ₁ and second coil U ₂ , V ₂₎ is applied even in a high rotation speed range. It is possible to obtain a high torque even at a high rotation speed as compared with the high rotation range of the system (first system) in which _{W 2 is connected in series).}

In addition, by not providing an iron core in the coil and ensuring the strength of shape maintenance by the litz wire, the self-inductance can be kept small, and the response from switching to characteristic switching by connection switching by the circuit unit 20 can be achieved. It can enhance the sex.

[Second Embodiment]
Next, the configuration of the motor 10 according to the second embodiment will be described with reference to FIGS. 10 to 11. The motor 10 according to the present embodiment has a different configuration of the operating coil 18 from the motor 10 according to the first embodiment. Regarding the configuration of the motor 10, the parts having the same operation shall be described with reference to FIG.

The operating coil 18 according to the present embodiment is a three-phase 12-pole system in which four coils (12 in total) are used in one phase.
In the operating coil 18 having such a configuration, the coils constituting each phase (first coil U ₁ , second coil U ₂ , third coil U ₃ , fourth coil U ₄ , first coil V ₁ , second coil) are used. Circuit unit 20 (20U ₁ ) between V ₂ , 3rd coil V ₃ , 4th coil V ₄ , 1st coil W ₁ , 2nd coil W ₂ , 3rd coil W ₃ , 4th coil W _{4), respectively.} , 20U ₂ , 20U ₃ , 20V ₁ , 20V ₂ , 20V ₃ , 20W ₁ , 20W ₂ , 20W ₃ ) are provided.

As the configuration of the circuit unit 20, the

circuit units

20U ₁ , 20U ₃ , 20V ₁ , 20V ₃ , 20W ₁ , 20W ₃ are the same as those of the

circuit unit

20U, 20V, 20W according to the first embodiment. On the other hand, the

circuit units

20U ₂ , 20V ₂ , and 20W ₂ are configured such that the number of input ports and the number of output ports of the second switch B are opposite to those of the first switch A.

In the motor 10 having such a configuration, in each of the U phase, the V phase, and the W phase, the first switch A and the second switch B are set to the a port for _{the circuit units 20U 1} to 20 W _{3, respectively.} 1 coil U ₁ to 4th coil U ₄ , 1st coil V ₁ to 4th coil V ₄ , 1st coil W ₁ to 4th coil W ₄ are connected in series (this state is referred to as 1 para). Referred to: (see Fig. 9).

_{Further, when the first switch A and the second switch B of the circuit units 20U 2} , 20V ₂ , and 20W ₂ are set to the b port from the state of one para, for example, in the U phase, the first coil U ₁ and the second coil U ₂ is connected in series, the third coil U ₃ and the fourth coil U ₄ are connected in series, respectively, _{and the pair of the first coil U 1} and the second coil U _{2 and} the set of the third coil U ₃ and the fourth coil U ₄ are connected. Will be connected in parallel. It should be noted that each coil is similarly connected in the V phase and the W phase (this state is referred to as 2 paras: see FIG. 10).

Further, in each of the U phase, the V phase, and the W phase, when the first switch A and the second switch B are set to the b port for _{the circuit units 20U 1} to 20 W ₃ _{, the first coil U 1} to the first coil are used. The 4-coil U ₄ , the 1st coil V ₁ to the 4th coil V ₄ , and the 1st coil W ₁ to the 4th coil W ₄ are connected in parallel (this state is referred to as 4 paras: see FIG. 11). ..

In the motor 10 having the above configuration, the system with more coils connected in series has higher torque characteristics (1 para above), and the system with more coils connected in parallel has higher rotational characteristics (4 paras above). Taking advantage of these characteristics, the relationship characteristics between torque and rotation speed (TN characteristics) and the relationship characteristics between torque and current (T-) when the system is switched from 1 para to 4 paras to operate the motor 10. The I characteristic) is shown in FIG.

According to FIG. 12, by switching the system to 1 para, 2 para, and 4 para as the rotation speed increases, it is possible to realize high torque operation while suppressing the power consumption to a predetermined value or less. .. In addition, by switching between 2 para and 4 para, it is possible to realize operation in a high rotation range that cannot be obtained by 1 para. For example, when the motor 10 having such a configuration is applied to the power for propulsion of an electric vehicle, the four paras, the two paras, and the one paras function as transmission mechanisms corresponding to the top gear, the second gear, and the low gear, respectively. Will be.

[effect]
Even with the motor 10 having such a configuration, a predetermined torque can be obtained even in a high rotation range as in the motor 10 according to the first embodiment.
In addition, by not providing an iron core in the coil and ensuring the strength of shape maintenance by the litz wire, the self-inductance can be kept small, and the response from switching to characteristic switching by connection switching by the circuit unit 20 can be achieved. It can enhance the sex.
Further, by increasing the number of coils and circuit units, the degree of freedom in switching the characteristics can be improved.

[Application form]
In each of the above embodiments, the circuit unit is provided in a single coil unit. However, the number of coils arranged between the circuit units is not limited to one. For example, by varying the number of coils arranged between circuit units and devising the arrangement of circuit units, it is possible to equalize the number of coils connected in series when connecting coils in parallel. , It is possible to widen the range of characteristic change by the combination of the coil connected in series and the coil connected in parallel.

In the motor 10 having the configuration of the working coil 18, as shown in FIG. 13 for example, each phase (U phase, V phase, W phase) 12 coil (first coil through twelfth _coil: U 1 _{-W 12)} It was placed, and the configuration of providing five circuit portion _(20U 1 -20W _5). As an example, circuit portion _20U 1 -20U ₅₎ is in the U-phase, between the coil _{U 3} and the coil _{U 4,} between the coil _{U 4} and the coil _{U 5,} between the coils _{U 6} and the coil _{U 7,} coil _{U 8} They are respectively between the coil _{U 9,} and between the coil _{U 9} and the coil _{U 10} and. Also in the V-phase and W-phase, the arrangement of the circuit section _(20V 1 -20W ₅₎ are the same.

The circuit section _(20U 1 -20W _5), ports a1, b1, a2, b2, c1, c2 , respectively are provided. The circuit having such a port _(20U 1 -20W _5), ports a1, b1 is the switchable between a port c1, port a2, b2 are the switchable between a port c2 , Both are configured to be switched at the same time.

It will now be described switching of the relationship of the switching circuit section of the connection of the actuating coil 18 in this embodiment _(20U 1 -20W _5). Since the corresponding circuit section _(20U 1 -20W ₅₎ is that at the same time switching respectively made in each layer, in the following description, the circuit portion _20U _1, 20V 1, 20W ₁ the circuit part 20X _1, circuit portion 20U ₂ , 20V ₂ , 20W ₂ for circuit section 20X ₂ ,

circuit section

20U ₃ , 20V ₃ , 20W ₃ for circuit section 20X ₃ ,

circuit section

20U ₄ , 20V ₄ , 20W ₄ for circuit section 20X ₄ ,

circuit section

20U ₅ , 20V ₅ and 20W ₅ will be referred to as a circuit unit 20X ₅ and will be described.

In the motor of this embodiment, in the case of 1 para (series connection), in all the circuit portions 20X ₁ -20X _5, switching is set as a port and port c is connected. Further, in the case of a two-para is switched set so that only the circuit portion 20X ₃ is b-port and port c is connected. Further, in the case of 3 paras, the circuit unit 20X ₂ and the circuit unit 20X ₄ are switched and set so that the b port and the c port are connected. Further, in the case of 4 paras, the circuit unit 20X ₁ and the circuit unit 20X ₃ and the circuit unit 20X ₅ are switched and set so that the b port and the c port are connected.

When the coils constituting each phase are arranged in a cylindrical shape, the form as shown in FIG. 14 is obtained. In the example shown in FIG. 14, _{the boundary portion between the coil U 1} and the coil U ₁₂ is used as an input / output end for electric power, and the coils U _{1 to} U ₁₂ are arranged in a cylindrical (annular) shape around the right side. In the coil of this arrangement form, when performing the above 2 para coil in the circuit portion 20 U ₃ is divided (into two equal parts), coil _U 1 -U _6, coil _U 7 _{-U 12} are connected in series, respectively The Rukoto. When the above three parameters are executed, the coils are divided (divided into three equal parts) by _{the circuit units 20U 2} and 20U ₄ _{, and the coils U 1 to} U ₄ , the coils U _{5 to} U ₈ , and the coils U _{9 to} U ₁₂ are respectively. It will be connected in series. Further, when the above four paras are executed, the coil is divided (divided into four equal parts) by _{the circuit units 20U 1} , 20U ₃ , and 20U ₅ _{, and the coils U 1-} U ₃ , U _4- U ₆ , U _7- U ₉ , U _{10 to} U ₁₂ will be connected in series, respectively.
Although the U-phase coil arrangement is shown in FIG. 14, the same applies to the V-phase and W-phase.

In the above embodiment, the number of coils and the number of circuit parts are limited, but the number of coils and circuit parts may be further increased to increase the number of combinations when connecting the coils in series and in parallel. good. Further, not only the combination of the coil connection forms may be increased, but also the appropriate rotation speed and torque may be selected according to the application, and the combination of the coil connection forms may be limitedly determined. For example, when applying to applications such as power tools where you want to earn more rotation speed than the torque of the initial operation, you can select and switch the combination of coils that can perform characteristic operation in the high rotation range, such as 4 para and 3 para. You can do it.

Further, in the above embodiment, the circuit unit 20 is mechanically shown in order to make it easier to understand the switching of the coil connection form, but the circuit unit 20 is provided with the same function by the semiconductor chip. May be.

Further, in the above embodiment, it is described that the form of the operating coil 18 is cylindrical. However, the motor according to the present invention can also include a form in which the operating coils are arranged in a disk shape.

10 ………… Motor, 12 ………… Housing, 12a ………… Bearing, 14 ………… Rotating shaft, 16 ………… Rotor, 16a ………… Permanent magnet, 16b ………… Inner yoke, 16c ………… Outer Yoke, 18 ......... Actuating coil, 18a ......... Conductive wire, 18b ......... Enamel layer, 18c ......... Skin layer, 20 (20U, 20V, 20W) ......... Circuit unit, 22 ......... Control unit , U ₁ ………… 1st coil, U ₂ ………… 2nd coil, U ₃ ………… 3rd coil, U ₄ ………… 4th coil, V ₁ ………… 1st coil, V ₂ …… … 2nd coil, V ₃ ……… 3rd coil, V ₄ ……… 4th coil, W ₁ ……… 1st coil, W ₂ ……… 2nd coil, W ₃ ……… 3rd coil, W ₄ ……… 4th coil.

Claims

A housing, a rotating shaft rotatably supported by the housing, a non-rotating working coil arranged around the rotating shaft, and a magnet located on the opposite surface of the working coil away from the working coil. A coreless rotary electric machine with a rotor and
The working coil is composed of three phases U, V, and W, each layer is composed of a plurality of coils, and a circuit that enables switching of the connection type of the coils constituting each layer to either a series type or a parallel type. A rotating electric machine characterized by having a part.
The rotary electric machine according to claim 1.
The actuating coil is a rotary electric machine characterized in that it has a cylindrical shape.
The rotary electric machine according to claim 1 or 2.
The circuit section is provided between the coils constituting the poles, respectively.
A rotary electric machine characterized in that the circuit unit is switched in units of corresponding poles of each layer.
The rotary electric machine according to any one of claims 1 to 3.
It is equipped with a control unit that switches the circuit unit so that the number of coils connected in series on the low rotation side is increased and the number of coils connected in parallel on the high rotation side is increased with respect to the predetermined threshold of rotation speed. A rotating electric machine featuring.
The rotary electric machine according to any one of claims 1 to 4.
The coil is a rotary electric machine characterized in that it is configured by using a litz wire.
An electric vehicle characterized in that the rotary electric machine according to any one of claims 1 to 5 is applied to power for propulsion.