JP2001103717A - Plural rotor motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plural rotor motor by adopting a so called cylindrical rotor having separately arranged front and rear rotors for plural rotors. SOLUTION: Plural stators 14A and 14B are arranged so that they oppose each of plural rotors 2 and 3 with a different number of paired magnetic poles rotating independently, the number of electrical phases of each stator is equated, and the electrical phases can be driven by the compound sum of each current corresponding to the plural rotors. Therefore, the plural rotors 2 and 3 and the stators 14A and 14B configure independent motors that do not share a magnetic field circuit and are independent each other, and at the same time a compound current is supplied from an inverter 112 that is common to plural stators, thus driving the plural rotors simultaneously at a different speed and hence adopting a cylindrical rotor for the plural rotors for increasing speed, arranging the plural rotors in front and rear, and hence preventing demagnetization between the permanent magnets of the rotor and maintaining magnetic characteristics for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a multiple rotor motor.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 8-3 discloses a rotating electric machine having one stator and a plurality of independently rotatable rotors.
The thing described in 40663 gazette is known.

[0003]

However, in the conventional rotating electric machine, the two rotors are separately rotated synchronously. Therefore, a stator is provided with a coil dedicated to each rotor, and a current flowing through each dedicated coil is supplied to the stator. Two inverters to control must be provided, each coil,
Passing a current through each inverter has a problem that a loss due to the current cannot be avoided.

[0004] The inventors of the present invention have disclosed in Japanese Patent Application No.
No. 77449, which has two rotors with different number of pole pairs of magnets,
The present invention relates to a rotating electric machine that shares a magnetic circuit and allows each rotor to rotate independently by passing a composite current through a common coil.

The present invention is obtained by further improving the rotating electric machine invented by the inventors of the present invention, and a so-called cylindrical rotor which can be disposed as a plurality of rotors separately in front and rear can be adopted, and high speed operation can be achieved. It is an object to provide a multi-rotor motor that can be achieved.

[0006]

According to a first aspect of the present invention, there is provided a multi-rotor motor comprising a plurality of stator armatures arranged to face a plurality of rotors which rotate independently and have different numbers of magnet pole pairs. The number of electric phases is made equal, and the electric phases are driven by a composite sum of currents corresponding to the plurality of rotors.

According to a second aspect of the present invention, in the multiple rotor motor of the first aspect, the coils of the same polarity of the plurality of stator armatures are connected in series.

According to a third aspect of the present invention, in the multiple rotor motor according to the first aspect, the coils of the same polarity of the plurality of stator armatures are connected in parallel.

According to a fourth aspect of the present invention, there is provided a multiple rotor motor, wherein one stator armature is arranged so as to face a plurality of rotors that rotate independently and have different numbers of magnet pole pairs, and the electric phase of the stator armature is the plurality of rotors. The rotor is driven by a composite sum of respective currents corresponding to the rotor.

According to a fifth aspect of the present invention, in the multiple rotor motor of the first to fourth aspects, the plurality of rotors and the stator armature are accommodated in a single case.

[0011]

According to the first aspect of the present invention, a plurality of stator armatures are arranged so as to face each of a plurality of rotors which rotate independently and have a different number of magnet pole pairs. Since the numbers are equal and the electric phase is driven by the composite sum of the respective currents corresponding to the plurality of rotors, the plurality of rotors and the stator armature do not share a magnetic field circuit, and constitute mutually independent motors. Also, by supplying a current (composite current) from a common inverter to a plurality of stator armatures, a plurality of rotors can be driven to rotate simultaneously and at different speeds.

[0012] Thus, a plurality of rotors can be arranged in front and behind, whereby a plurality of rotors can be used in a cylindrical shape, and high-speed operation is possible. In addition, since a plurality of rotors can be arranged in front and behind, the same poles of the permanent magnets of the rotors do not face each other, no demagnetizing action works, and the magnetic characteristics can be maintained for a long time.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the corresponding coils of the same polarity of the plurality of stator armatures are connected in series, an inverter common to the plurality of stator armatures is provided. , And a plurality of rotors can be rotationally driven at rotational speeds and torques independent of each other.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the same coils of the same polarity of the plurality of stator armatures are connected in parallel. By flowing the current, a plurality of independent motors can be simultaneously driven to rotate at different speeds.

According to the fourth aspect of the present invention, one stator armature is arranged so as to face a plurality of rotors that rotate independently and have different numbers of magnet pole pairs, and the electric phase of the stator armature corresponds to the plurality of rotors. Are driven by the composite sum of the respective currents,
By passing a composite current through one stator armature, a plurality of rotors can be driven to rotate simultaneously and at different speeds. Moreover, a plurality of rotors can be arranged back and forth in the axial direction, and can be assembled into a structure in which a cylindrical stator armature is arranged so as to surround the outer circumference thereof. Can be adopted, and the speed can be increased. In addition, since a plurality of rotors can be arranged in front and behind, the same poles of the permanent magnets of the rotors do not face each other, no demagnetizing action works, and the magnetic characteristics can be maintained for a long time.

According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects, a plurality of rotors and stator armatures are accommodated in one case, so that the rotational speed and torque of each output shaft can be reduced. Different multi-axis motors can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a structure of a multi-rotor motor according to a first embodiment of the present invention. In the multi-rotor motor according to the first embodiment, two motors are connected to one stator armature 14 by a common stator coil 14.
6 are independently driven to rotate by passing a composite current through the same. In this multi-rotor motor, a first rotor 2 and a second rotor 3 are arranged before and after in the axial direction in a case 1. The output shaft (A-axis) 4 of the first rotor 2 is provided concentrically with the output shaft (B-axis) 5 of the second rotor 3 and has a double structure. The first rotor 2 is provided with three pairs of permanent magnets (A magnets) 6, and the second rotor 3 is provided with four pairs of permanent magnets (B magnets) 7. The number of pole pairs and the ratio of the number of poles of the permanent magnet are not particularly limited, but are illustrative.

One core 11 is arranged on the outer peripheral side of the first and second rotors 2 and 3 so as to form a stator armature 14, and twelve slots 15 are formed in the core 11, and a stator coil 16 is formed. Is wrapped around.

In this split core motor, the first rotor 2 and the second rotor
The rotors 3 can be individually driven to rotate. The principle is described in detail in the specification of Japanese Patent Application No. 10-77449, which is a prior application of the present inventors.
The control device of the rotary drive system in the present embodiment will be described later.

Next, a description will be given of an integrated assembly structure of the stator armature 14 in the multiple rotor motor. The outer peripheral side of the slot 15 of the core 11 has a trapezoidal shape in which the outside is narrow and the inside is wide. A retaining pin 18 having a trapezoidal cross section perpendicular to the axial direction is inserted into each of the twelve slots 15.

Fixing rings 21 and 22 are attached to the inner surfaces of the front and rear end plates of the case 1 so as to face each other. Annular grooves 23 and 24 are formed in the surfaces of the fixing rings 21 and 22 facing each other, and when the stator armature 14 is assembled and integrated into the case 1, both ends in the axial direction of each retaining pin 18. Are press-fitted into these annular grooves 23 and 24, respectively.
At an intermediate position in the front-rear direction between the first rotor 2 and the second rotor 3, a reinforcing ring 25 is disposed so as to be in close contact with the inner peripheral surface of the core 11 of the stator armature 14.

In the multi-rotor motor having such a structure,
When the stator armature 14 is assembled into the case 1 and the front and rear end plates are tightened, both axial ends of the retaining pins 18 are fixed to the annular grooves 23 and 22 of the fixing rings 21 and 22, respectively.
24 respectively. As a result, each of the retaining pins 18 receives a radially outward force and acts to push up the outer peripheral portion of each of the slots 15 and 17. Therefore, the core 11 is fixed to the case 1 by the retaining pin 18.
It is assembled so as to be integrated with it. Further, since both ends of each retaining pin 18 in the axial direction are subjected to a force pushing up outward, the axially intermediate portion tends to bend inward,
Since the core 11 and the reinforcing ring 25 are in close contact with that portion, the axially intermediate portion of the retaining pin 18 and the core 11 and the reinforcing ring 25 are pressed against each other, and the stator armature 1
The integration of the intermediate portion in the axial direction of No. 4 is also achieved.

The control device for the rotary drive system of the multi-rotor motor having the above structure has a circuit configuration shown in FIG. The stator coil 16 has 12 phases, and a power supply 111 such as a battery is used to supply a composite current to the stator coil 16.
Inverter 112 converts DC current from AC into AC current
It has. Since all the instantaneous currents sum to zero,
The inverter 112 is the same as a normal three-phase bridge type inverter having 12 phases, and is composed of 24 switching elements vertically and the same number of diodes.
An on / off gate signal applied to each gate of the inverter 112 is a PWM signal.

In order to rotate the rotors 2 and 3 synchronously, rotation angle sensors 113 and 114 such as a rotary encoder or a resolver for detecting the phase of each rotor 2 and 3 are provided. In the control circuit 115 to which the signal from 114 is input, the first rotor 2,
A PWM signal is generated based on required torque data for the second rotor 3 (that is, torque command).

In the multi-rotor motor having such a circuit configuration, a single coil 16 is formed on the stator armature 14, and a composite current is applied to the single stator coil 16 so as to generate the same number of rotating magnetic fields as the number of rotors. By flowing one of the rotors as a motor and the other as a generator, it is only necessary to pass the current of the difference between the motor drive power and the generated power to a single coil, thus greatly improving efficiency. Can be.

When only one inverter 112 is required for the two rotors 2 and 3, and when one of the rotors 2 and 3 is operated as a motor and the other is operated as a generator, the motor drive power is increased as described above. It is only necessary to flow the current corresponding to the difference between the power and the generated power to a single coil, so that the capacitance of the power switching transistor of the inverter 112 can be reduced, thereby improving the switching efficiency and improving the overall efficiency. I do.

Further, in the case of the first embodiment, the first rotor 2 and the second rotor 3 are disposed before and after in the axial direction, and the periphery thereof is surrounded by a common cylindrical stator armature 14. Therefore, the rotors 2 and 3 can be of a cylindrical type instead of a drum type, and can rotate at high speed. In addition, since the plurality of rotors 2 and 3 can be arranged in front and behind, the same pole of the permanent magnet of each rotor does not face each other, the demagnetizing action does not work, and the magnetic characteristics can be maintained for a long time.

Next, a multi-rotor motor according to a second embodiment of the present invention will be described with reference to FIGS. The multi-rotor motor according to the second embodiment is a so-called 2 rotor motor.
Combination of two motors back and forth in one case 1
It has the same structure as that housed inside. In this multi-rotor motor, a first rotor 2 and a second rotor 3 are arranged before and after in the axial direction in a case 1. The output shaft (A-axis) 4 of the first rotor 2 is connected to the output shaft (B-axis) of the second rotor 3.
The shaft 5) is provided concentrically and in a double structure. The first rotor 2 has three permanent magnets (A magnets) 6.
The second rotor 3 has a permanent magnet (B
The magnet 7 is provided in four pole pairs.

A cores 11 and B cores 12 are arranged on outer peripheral sides of the first and second rotors 2 and 3 so as to form stator armatures 14A and 14B. 12 slots 15A are formed for the A core 11, and the stator coil 1
6A is wound around the B core 12, and twelve slots 15B are formed in the B core 12 as well.
B is wound.

In the multi-rotor motor according to the second embodiment, the first rotor 2 and the second rotor 3 are individually driven to rotate by electrically connecting the stator coils 16A and 16B in parallel and passing a composite current. can do. In addition,
The principle is described in detail in the specification of Japanese Patent Application No. 10-77449, which is a prior application of the present inventors. The control device of the rotary drive system will be described later.

The assembled structure of the stator armatures 14A and 14B in the multi-rotor motor according to the second embodiment is the same as that of the first embodiment shown in FIG. , B core 12
The outer peripheral side of each of the slots 15B has a trapezoidal shape in which the outside is narrow and the inside is wide. A retaining pin 18 having a trapezoidal cross section perpendicular to the axial direction is inserted through each of the twelve slots 15A and 15B that are connected to the front and rear. Fixing rings 21 and 22 are attached to the inner side surfaces of the front and rear end plates of the case 1 so as to face each other. Annular grooves 23 and 24 are formed in the surfaces of the fixing rings 21 and 22 facing each other, and when the stator armatures 14A and 14B are assembled and integrated into the case 1, the axial direction of each of the retaining pins 18 is set. Both ends are press-fitted into these annular grooves 23 and 24, respectively. A reinforcing ring 25 is provided in a space between the A core 11 of the stator armature 14A and the B core 12 of the stator armature 14B, and the outer periphery of the reinforcing ring 25 is brought into close contact with the inner surface of each retaining pin 18. .

Next, a control device for a rotary drive system of a plurality of rotor motors according to a second embodiment of the above structure will be described with reference to FIG. The stator coils 16A and 16B are each composed of 12 phases, and a composite current is supplied to the stator coils 16A and 16B.
A, common inverter 1 for supplying in parallel to 16B
12 outputs. Other components are shown in Fig. 2.
Are common to those of the first embodiment shown in FIG.

In the multiple-rotor motor having such a circuit configuration, a common composite current is supplied to the stator coils 16A and 16B of the respective stator armatures 14A and 14B to generate the same number of rotating magnetic fields as the number of rotors.
The rotors 2 and 3 can be simultaneously driven to rotate at different speeds and torques to extract the output. That is, the two rotors 2 and 3 accommodated in one case 1 can be treated as two independent motors, and the same current is supplied from the common inverter 112 to these motors, so that different speeds can be obtained. , The output of the torque can be taken out.

Further, in the case of the second embodiment, similarly to the first embodiment, the first rotor 2 and the second rotor 3 are arranged in front and rear in the axial direction, and the periphery of them is cylindrical. Since the rotors are surrounded by the amateurs 14 and 14B, the rotors 2 and 3 can be of a cylindrical type instead of a drum type, and can rotate at a high speed. In addition, since the plurality of rotors 2 and 3 can be arranged in front and behind, the same poles of the permanent magnets of each rotor do not face each other, so that the demagnetizing action does not work, and the magnetic properties can be maintained for a long time.

Next, a multi-rotor motor according to a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is structurally similar to the second embodiment shown in FIG.
This embodiment is common to the first embodiment. The control device for the rotary drive system has the circuit configuration shown in FIG. That is, in the case of the second embodiment, two stator armatures 14A, 1
By connecting the respective stator coils 16A and 16B of the 4B in parallel to the inverter 112, so-called two independent motors are controlled by a common power supply. In the case of the present embodiment, however, the stator coils 16A and 16B are controlled by a common power supply. 16
A, 16B are connected in series for each phase, and the subsequent coil,
Here, each terminal on the side of the stator coil 16B is commonly connected.

The 12-phase composite current supplied by the inverter 112 is supplied to the coil of each electric phase.
Eventually, a common termination point is reached. Since the sum of all the instantaneous currents becomes zero, the current is zero at this terminal connection point.

By configuring such a control circuit, in the third embodiment, similarly to the second embodiment, the plurality of rotors 2 and 3 are made independent of each other by the power supplied by the common inverter. , Can be driven to rotate at different speeds.

The first and second rotors 2 and 3 are arranged before and after in the axial direction, and the periphery thereof is surrounded by cylindrical stator armatures 14 and 14B, respectively. Instead, a cylindrical type can be adopted, and high-speed rotation becomes possible. In addition, since the plurality of rotors 2 and 3 can be arranged in front and behind, the same poles of the permanent magnets of each rotor do not face each other, so that the demagnetizing action does not work, and the magnetic properties can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a side sectional view and a front sectional view showing a structure according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a control device for a rotary drive system according to the embodiment.

FIG. 3 is a side cross-sectional view and a front cross-sectional view illustrating a structure according to a second embodiment of the present invention.

FIG. 4 is a circuit block diagram showing a configuration of a control device for a rotary drive system according to the embodiment.

FIG. 5 is a circuit block diagram illustrating a configuration of a control device for a rotary drive system according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 1st rotor 3 2nd rotor 6 Permanent magnet (A magnet) 7 Permanent magnet (B magnet) 11 Stator core 12 Stator core 13 Stator core 14, 14A, 14B Stator armature 16, 16A, 16B Stator coil 111 Power supply 112 Inverter 113,114 Rotation angle sensor 115 Inverter

Claims (5)

[Claims] 1. A plurality of stator armatures are arranged so as to face a plurality of rotors which rotate independently and have different numbers of magnet pole pairs, and the number of electric phases of each of the stator armatures is made equal to each other. Is driven by a composite sum of respective currents corresponding to the plurality of rotors. 2. The multi-rotor motor according to claim 1, wherein the coils of the same polarity of the plurality of stator armatures are connected in series. 3. The multiple rotor motor according to claim 1, wherein the coils of the same polarity of the plurality of stator armatures are connected in parallel. 4. One stator armature is arranged so as to face a plurality of rotors that rotate independently and have different numbers of magnet pole pairs, and an electric phase of the stator armature is a composite of currents corresponding to the plurality of rotors. A multi-rotor motor driven by a sum. 5. The multi-rotor motor according to claim 1, wherein the plurality of rotors and the stator armature are accommodated in a single case.