JP3501046B2 - Rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having one stator and a plurality of independently rotatable rotors.

[0002]

2. Description of the Related Art A rotary electric machine having one stator and a plurality of independently rotatable rotors is disclosed in Japanese Patent Application Laid-Open No. 8-3.
The one described in Japanese Patent No. 40663 is known.

[0003]

However, in this conventional rotary electric machine, since the two rotors are separately rotated in synchronization, a coil dedicated to each rotor is prepared for the stator, and the current supplied to each dedicated coil is supplied. You also have to have two inverters to control, each coil,
There was a problem that current loss was unavoidable if current was passed through each inverter.

Therefore, the inventors of the present application filed Japanese Patent Application No. 10-0.
The invention described in the specification of No. 77449 is provided, which has two rotors having magnets having different numbers of poles, shares a magnetic circuit, and separates each rotor by passing a composite current through a common coil. The present invention relates to a rotating electric machine that can be rotated.

In such a rotary electric machine, when the magnetic fields of the same polarity of the magnets face each other, the magnets have a problem of deteriorating the magnet characteristics, especially at high temperatures, due to the demagnetization effect.

In this respect, the demagnetizing action does not occur unless the magnetic flux of the magnet of one rotor passes through the opposite magnets of the other rotor, but if the magnetic flux does not pass through the stator coil, no torque is generated. , Rotor cannot be rotated.

The present invention has been made in view of such contradictory problems. The stator lateral magnetic reluctance on the side with a small number of magnets is made smaller than that on the side with a large number of magnets, and the magnetic flux on the side with a large number of magnets is set. Is configured to positively pass through the stator coil, and the magnetomotive force of the magnet of the rotor with the smaller number of magnets is increased more than that of the other magnet, so that the magnet is demagnetized while maintaining torque. An object of the present invention is to provide a rotating electric machine that can prevent deterioration of characteristics.

[0008]

According to a first aspect of the present invention, two rotors with magnets having different numbers of pairs of magnet poles are arranged on the same rotating shaft, and a stator sharing a magnetic circuit for the two rotors is used. A rotary electric machine that is arranged between two rotors and that rotates the two rotors independently by causing a control current for driving each of the two rotors to flow in combination with the coils of the stator, wherein one rotor is other
The number of magnet pole pairs is smaller than that of the other rotor.
The magnetomotive force of the magnet provided in the rotor is converted into the other rotor.
The feature is that it is larger than the magnetomotive force of the magnet installed in the
And

According to a second aspect of the present invention, the one rotor is
The magnetic flux density of the provided magnet is set to the other rotor.
The magnetic flux density of the magnet used is
It

According to a third aspect of the invention, the other rotor
The thickness of the magnet of the one rotor with respect to the thickness of the magnet of
It is characterized by thickening.

According to a fourth aspect of the invention, the two rotors are
An inner rotor arranged inside the stator;
An outer rotor arranged outside the data,
One rotor is the inner rotor and the other rotor is
Is the outer rotor.

According to a fifth aspect of the present invention, the stator is provided.
The stator coil is provided near the outer circumference.
It

According to a sixth aspect of the invention, the outer rotor and
The inner and inner rotors are IPM type
It

[0014]

According to the invention of claim 1, two rotors containing magnets having different numbers of magnet pole pairs are arranged on the same rotation axis, and a stator sharing a magnetic circuit for these two rotors is used as the rotor. In a rotary electric machine that is arranged between the two rotors and rotates the rotors independently by flowing a control current that drives each of the two rotors into the coils of the stator, the magnetomotive force of a magnet provided on one rotor By making it larger than the magnetomotive force of the magnets provided in the rotors, it is possible to generate torque in the two rotors and rotate them independently of each other. When facing each other, it is possible to prevent the demagnetizing action from exerting a mutual effect on them, thereby suppressing deterioration of the characteristics of the magnet.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the magnet of the rotor on the side having a large number of magnet pole pairs is provided.
Of the rotor with the smaller number of magnet pole pairs with respect to the magnetic flux density of
By increasing the magnetic flux density of stone, the magnetic flux density is small
Maintains the torque of the rotor that contains the permanent magnet
be able to.

According to the invention of claim 3, claims 1 and 2
In addition to the effect of the invention, by increasing the thickness of the magnet of the rotor on the side with a small number of magnet pole pairs relative to the thickness of the magnet on the side of the rotor with a large number of magnet pole pairs, The torque can be maintained.

According to the invention of claim 4, two rotors
One of the rotors with the least number of magnet pole pairs
Side with a large number of magnet pole pairs
Of the outer rotor is provided outside the stator
Therefore, it is possible to suppress the decrease in the magnetomotive force of the inner rotor.
it can.

According to the invention of claim 5, in addition to the effect of the invention of claim 4 , since the stator coil of the stator is provided closer to the outer peripheral side , it is possible to increase the number of windings of the stator coil and to manufacture the stator. Can be done easily.

According to the sixth aspect of the invention, in addition to the effects of the first to fifth aspects of the invention, an efficient rotating electrical machine can be obtained by using the rotating electrical machine of the IPM type.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 to 3, the rotary electric machine 1 has a three-layer structure by arranging rotors 3 and 4 on the outer side and the inner side of a cylindrical stator 2 with a predetermined gap. The outer and inner rotors 3 and 4 are provided rotatably and coaxially with respect to the outer frame 5 covering the whole.

On the half circumference of the inner rotor 4, the S pole is attached to the stator 2
The permanent magnet is provided so as to come to the side, and the permanent magnet is provided so that the N pole comes to the side of the stator 2 in the other half circumference. The outer rotor 3 is the inner rotor 4 in this embodiment.
The permanent magnets are provided so that the number of poles per pole is 2 (2: 1 in terms of the number of pole pairs). That is, the outer rotor 3 has two S-poles and two N-poles on the stator 2 side, and the S-poles and the N-poles are arranged so as to be switched every 90 degrees. The permanent magnets are attached to the surfaces of the rotors 3 and 4, and the rotating electric machine of this embodiment is of the SPM type.

By arranging the magnetic poles of the rotors 3 and 4 in this way, the magnets of the inner rotor 4 are not given a rotational force by the magnets of the outer rotor 3, and vice versa.
The magnet of (1) is not given a rotational force by the magnet of the inner rotor (4).

For example, consider the effect of the magnets of the inner rotor 4 on the outer rotor 3. For simplicity, consider the inner rotor 4 fixed. In the state shown in FIG. 1, first, when the upper magnet S of the inner rotor 4 and the upper magnets S and N of the outer rotor 3 facing the upper magnet S try to rotate clockwise, the lower magnet N of the inner rotor 4 is rotated. In relation to the lower magnets S and N of the outer rotor 3 facing each other, the lower magnets S and N of the outer rotor 3 are defined by the lower magnet N of the inner rotor 4.
Tries to rotate counterclockwise. That is, the magnetic force exerted by the upper magnet S of the inner rotor 4 on the upper magnets S, N of the outer rotor 3 and the magnetic force exerted by the lower magnet N of the inner rotor 4 on the lower magnets S, N of the outer rotor 3 cancel each other. Therefore, the outer rotor 3 can be controlled only by the relationship with the stator 2 and not by the inner rotor 4. This is the same between the rotating magnetic field generated in the stator coil described later and the rotor.

The stator 2 is composed of three coils 6 for each magnetic pole of the outer rotor 3, and a total of 12 coils (= 3 × 4).
Coils are evenly arranged on the same circumference. Reference numeral 7 denotes a core around which the coil 6 is wound, and the same number of cores 7 as the coils 6 are arranged on the circumference at equal intervals with a predetermined gap (gap) 8. Each stator coil 6 is provided near the outer periphery of the stator core 7, that is, near the outer rotor 3 having a large number of magnetic pole pairs.

As will be described later, twelve coils are distinguished by numbers. In this case, for example, in the sense of the sixth coil, the coil number is indicated by enclosing it in parentheses, such as coil [6]. To do.

The following complex currents I1 to I12 are passed through these twelve coils 6. First, for supplying a current (three-phase alternating current) to generate a rotating magnetic field with respect to the inner rotor 4, [1,2] = [7, 8], [3, 4] = [9,1
0], [5, 6] = [ 11 , 12 ] 1 in 3 sets of coils
The currents Id, If, and Ie whose phases are shifted by 20 degrees are set. Here, the underline under the number indicates that the current flows in the opposite direction. For example, letting a current Id flow through a pair of coils [1, 2] = [ 7 , 8 ] means that a half current of Id is applied from the coil [1] to the coil [ 7 ] and then from the coil [2]. I also face the coil [ 8 ]
That is, the current of the other half is supplied. Since the coils [1] and [2] and the coils [ 7 ] and [ 8 ] are located at positions close to each other on the circumference, this current supply causes a rotating magnetic field of the same number (2 poles) as the magnetic poles of the inner rotor 4 to be generated. Can be generated.

Next, since a current (three-phase alternating current) for generating a rotating magnetic field for the outer rotor 3 is passed, [1] = [ 4 ]
= [7] = [ 10 ], [ 2 ] = [5] = [ 8 ] = [1
The currents Ia, Ic, and Ib whose phases are shifted by 120 degrees are set in the three sets of coils of [1] and [3] = [ 6 ] = [9] = [ 12 ]. For example, one set of coils [1] = [ 4 ] =
[7] = flowing the current Ia in [ 10 ] means coil [1]
Means that a current of Ia is made to flow from the coil [ 4 ] to the coil [ 4 ], and the same current Ia is made to flow from the coil [7] to the coil [ 10 ]. Since the coils [1] and [7] and the coils [ 4 ] and [ 10 ] are located 180 degrees apart from each other on the circumference, the same number of magnetic poles (4 poles) as the outer rotor 3 is supplied by this current supply. A rotating magnetic field can be generated.

As a result, if the following composite currents I1 to I12 are passed through the twelve coils 6, both the inner rotor 4 and the outer rotor 3 can be rotationally driven.

I1 = (1/2) Id + Ia I2 = (1/2) Id + Ic I3 = (1/2) If + Ib I4 = (1/2) If + Ia I5 = (1/2) Ie + Ic I6 = ( 1/2) Ie + Ib I7 = (1/2) Id + Ia I8 = (1/2) Id + Ic I9 = (1/2) If + Ib I10 = (1/2) If + Ia I11 = (1/2) Ie + Ic I12 = (1/2) Ie + Ib However, the underline under the current symbol indicates that the current is in the reverse direction.

The composite current setting will be further described with reference to FIG. For comparison with FIG. 1, FIG. 2 shows the arrangement of dedicated coils for generating different rotating magnetic fields for each rotor on the inner and outer peripheral sides of the stator 2. That is, the arrangement of the inner side coils d, f, e generates a rotating magnetic field for the inner rotor 4, and the arrangement of the outer side coils a, c, b generates a rotating magnetic field for the outer rotor 3. In this case,
In order to reconfigure the two dedicated coils into a single coil as shown in FIG. 1 by sharing them, half of the current flowing through the coil d is divided into coils a and c located near the coil d among the inner coils. In the same manner, half of the current flowing in the coil f is applied to the coils b and a near the coil f, and half of the current flowing in the coil e is applied to the coils c and b located near the coil e. You just have to pay. The formulas of the composite currents I1 to I12 described above express such an idea in a mathematical formula. The current setting method is not limited to this.

When the current is set as described above, two magnetic fields, that is, a rotating magnetic field for the inner rotor 4 and a rotating magnetic field for the outer rotor 3 are simultaneously generated with a single coil, but the magnet of the inner rotor 4 is The rotating magnetic field for the outer rotor 3 does not give a rotating force, and the magnet of the outer rotor 3 does not receive a rotating force for the inner rotor 4.

The above settings of the currents Id, If, Ie are synchronized with the rotation of the inner rotor 4, and the currents Ia, Ic, Ib are set.
Is set in synchronization with the rotation of the outer rotor 3. The phase lead and lag are set with respect to the torque direction, which is the same as for the synchronous motor.

A control device for the rotating electric machine having the above configuration will be described with reference to FIGS. 3 and 4. The control device for the rotating electric machine includes an inverter 12 that converts a direct current from a power source 11 such as a battery into an alternating current in order to supply the composite currents I1 to I12 described above to the stator coil. Since the sum of all the instantaneous currents becomes 0, this inverter 12 is the same as a normal three-phase bridge type inverter having 12 phases as shown in FIG. 4, and has 24 switching elements Tr1 to Tr24 at the top and bottom. And the same number of diodes. The on / off gate signal given to each gate of the inverter 12 is a PWM signal.

Rotation angle sensors 13 and 14 for detecting the phases of the rotors 3 and 4 in order to synchronously rotate the rotors 3 and 4.
Is provided, and the control circuit 15 to which the signals from these sensors 13 and 14 are input generates a PWM signal based on the required torque data (that is, torque command) for the outer rotor 3 and the inner rotor 4. .

In the rotating electric machine having such a structure, the two rotors 3 and 4 and the one stator 2 have a three-layer structure and are formed on the same shaft, and the stator 2 is formed with a single coil 6. Then, by supplying a composite current to the single coil 6 so that the same number of rotating magnetic fields as the number of rotors are generated,
When one of the rotors is operated as a motor and the other is operated as a generator, it is sufficient to flow a current of the difference between the motor driving power and the generated power through a single coil, so that the efficiency can be significantly improved.

Further, one inverter is provided for two rotors.
When operating one of the rotors as a motor and the other as a generator, it suffices to pass a current corresponding to the difference between the motor drive power and the generated power to a single coil as described above. Therefore, the capacitance of the power switching transistor of the inverter can be reduced, which improves the switching efficiency,
Overall efficiency will be improved.

It is to be noted that such a rotary electric machine is not limited to the case where the pole pair number ratio of the two rotors is 2: 1, but may be 3: 1 or 3: 2, or any other type. Are described in the specification of this application.

When a composite current is passed through the coil 6 of the stator 2, the temperature may rise and the permanent magnets of the rotors 3 and 4 may be affected to deteriorate the magnetic characteristics. Figure 5
Shows the magnetic flux density B-magnetic field strength H characteristic of the permanent magnet, but at high temperature, the magnet enters the demagnetization characteristic region Z and the magnet characteristic deteriorates. In addition, a region where the magnetic flux density B is negative (3rd
In the quadrant), it exhibits the property of being easily demagnetized even in a relatively low temperature state. In FIG. 5, the magnet short-circuit (H = 0) magnetic flux at temperature t4 is Bmax, and the demagnetization inflection point magnetic flux density is Bmax.
m and the leakage magnetic flux in the rotor is Bx.

FIG. 6 shows a circumferentially expanded state between the coil [1] and the coil [12] shown in FIG.
In the horizontal axis direction, the coil number is given to the center position of the expansion coil. In the vertical axis direction, the magnetic flux density Bb of the magnet alone of the inner rotor 4 is the first stage from the top, and the magnetic flux density Ba, Bb of the inner and outer rotors 3 and 4 are compared with the respective coil positions of the stator 2 at the second stage. And the superposed magnetic flux density Bc, and the third stage shows the magnetic flux density Ba in the magnet alone of the outer rotor 3. In the magnetic field, the S poles face each other at the position of the coil [4] of the stator, and the magnetic flux is the most difficult to flow. At the position of the coil [10] of the stator, the magnetic pole of the inner rotor 4 is N and the magnetic pole of the outer rotor 3 is S, so that the superposition magnetic flux density Bc is the maximum.

In FIG. 6, the direction of the magnetic flux from the inner rotor 4 to the outer rotor 3 is set to the lower side in the drawing. The magnetic flux density of the magnet is the peak of the magnetic flux density, ignoring the magnetic resistance of the magnetic circuit, and the Bma of the BH curve in FIG.
It is shown as x and further normalized by Bmax = 1.

Further, the relationship between the magnetic field strength H of the magnet and the magnetic flux density B is shown in FIG. 5. As can be seen from this, the magnetic field strength of the permanent magnet is originally the magnetic flux density unless the magnetic resistance at the operating point is determined. Although it is not decided, in FIG. 6, it is easy to understand the state where the same poles of the permanent magnets face each other.
The magnetic flux density distribution of the magnet is intentionally expressed as a sine wave with a constant magnetic resistance. Originally, F: magnetomotive force, L: magnet thickness, R: magnetic resistance, φ: magnetic flux, B: magnetic flux density, S: as magnet area, F = H × L, φ = F / R, B = φ / S , The magnet thickness L can be expressed as
The four magnets are described as being the same. Since the magnet area S is a requirement determined by the configuration of the rotating electric machine, it is treated as a predetermined value.

FIG. 7 shows the magnetic flux density distribution when the magnetomotive force of the outer rotor 3 having a relatively large number of magnetic poles is reduced by increasing the magnet magnetic field strength of the inner rotor 4. Here, the magnetic field strength of the inner rotor 4 is set to 1.5 (that is, 1.5 times) the normalized value 1 of the magnetic field strength of the inner rotor 4 in FIG. This allows the outer rotor 3
The magnetic flux in the area of the section A between the S poles of is not demagnetized if Bm ≦ B3 + B4 + B5 + Bx is satisfied.

However, Bm is the demagnetization region branch magnetic flux density at the temperature t4 in FIG. 5, and Bx is the magnetic flux flowing from the magnetic poles N to S in the outer rotor 3 (thus, passing through the stator 2 and the inner rotor). Magnetic flux that does not flow to 4), B3, B4
B5 are stator coils [3], [4], [5], respectively
Is the passing magnetic flux of.

FIG. 8 shows an equivalent electric circuit of the magnetic circuit of the rotating electric machine shown in FIG. 1, and FIG.
(B) shows the magnetic circuit model replaced with an equivalent electric circuit model for easy understanding. However, in FIG. 9, the number of magnet poles is 8: 4 (the pole pair number ratio is 2: 1), and although it is a diagram of 24 stator cores, it corresponds to the rotary electric machine having the structure of FIG. 1 at an angle π.

First, the equivalent circuit of FIG. 8 will be described. Μ: Permeability of permanent magnet Im1: Equivalent DC current of outer rotor 3 Im2: Equivalent DC current of inner rotor 4 Vmn, i: Generation of permanent magnet of inner rotor 4 Magnetic force Vmn, o: Magnetomotive force Ecn of permanent magnet of outer rotor 3: Magnetomotive force of stator coil n: Coil position Rl: Stator longitudinal magnetic resistance Rg: Gap equivalent magnetic resistance Ri: Inner lateral magnetic resistance Ro: Outer lateral direction It is a magnetic resistance, and Ri <Ro. Then, the magnetomotive force Vm of the permanent magnet of the inner rotor 4
n, i and the magnetomotive force Vmn, o of the permanent magnet of the outer rotor 3 are determined by the following equations.

[0046]

[Equation 1] However, θ is the phase shift from the reference position in the initial state, and α is the initial phase shift of the inner and outer rotors 3, 4.

The concept of the equivalent electric circuit of FIG. 8 is shown in FIG.
When applied to the rotating electric machine shown in FIG. 9A, the results shown in FIG. 7 can be obtained by setting the magnetic resistances of the respective parts to Ri, Ro, and Rg as shown in FIG. 9B.

Returning to FIG. 7, when the magnetic field strength of the inner rotor 4 is increased 1.5 times, the magnetic flux flowing through the stator coils [2] and [6] is the magnetic flux loop LP1 from the outer rotor 3 to the inner rotor 4, There is a magnetic flux loop LP2 that passes through the inner lateral magnetic resistance Ri in FIG. 8 and returns to the outer rotor 3. In the stator coil [4], since the magnetic field strength of the inner rotor 4 is increased, the magnetic flux flows from the outer rotor 3 to the inner rotor 4 (flux loop LP3).

However, since the magnetic flux flows through the magnetic flux loop LP2 in the inner rotor 4, the magnetic flux escapes demagnetization, and at the same time, the magnetic flux passes through the stator coil, so that torque is generated.

In this manner, the rotors 3 and 4 with magnets having different numbers of magnet pole pairs are arranged inside and outside the stator 2, and the control current for driving the rotors 3 and 4 inside and outside is combined with the stator coil. In the rotary electric machine 1 that rotates these rotors 3 and 4 by flowing, the magnetomotive force of the magnet of the inner rotor 4 having a smaller number of magnet pole pairs is made larger than the magnetomotive force of the magnet of the outer rotor 3 having a large number of magnet pole pairs. By arranging the stator coil near the outer rotor 3 having a large number of pairs of magnet poles, torque can be generated in the inner and outer rotors 3 and 4, and the same poles of the permanent magnets of the inner and outer rotors 3 and 4 face each other. Even in this case, the demagnetizing action does not occur, deterioration of the magnet characteristics can be suppressed, and the life of the rotating electric machine can be extended.

In the above embodiment, the magnetomotive force of the magnet of the inner rotor 4 having a smaller number of pairs of magnet poles is made larger than the magnetomotive force of the magnet of the outer rotor 3 having a large number of pairs of magnet poles, and the stator coil is set to a magnet pole. Although the magnets are arranged closer to the outer rotor 3 having a large number of logarithms, on the contrary, the magnetomotive force of the magnet of the inner rotor 4 having a smaller number of magnet pole pairs is made smaller than the magnetomotive force of the magnet of the outer rotor 3 having a large number of magnet pole pairs. Is also possible. Figure 1
In the case of 0, the same developed view is shown when the magnetic field strength of the inner rotor 4 is reduced to 0.7 times the magnetic field strength of the inner rotor 4 shown in FIG.

As can be seen from FIG. 10, by lowering the peak of the magnetomotive force of the inner rotor 4, the magnetic flux B4 passing through the coil [4] becomes negative, which is smaller than that of the permanent magnet of the inner rotor 4 having a small number of magnetic poles. The magnetic action can be avoided in the same manner as in the above-mentioned embodiment, but in this case, there is a problem in that torque is not output because the inner current value becomes low.

Further, in the above embodiment, the magnetomotive force of the permanent magnet of the inner rotor 4 is made larger than the magnetomotive force of the permanent magnet of the outer rotor 3. However, as a method of changing the magnetomotive force, the thickness of the magnet is changed. Can be realized by increasing the thickness of the magnet and by selecting a magnet having a large magnetic flux density.

In addition, although the surface magnet (SPM) type rotary electric machine is described in the above embodiment, the present invention can be applied to an IPM type rotary electric machine in which a permanent magnet is embedded in a rotor. And in that case, I
Compared to the SPM type, the PM type has an advantage that the surface magnetic flux density can be made uniform against the nonuniformity of the external magnetic field and local demagnetization of the magnet can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the operating principle of the rotary electric machine of the above embodiment.

FIG. 3 is a block diagram showing a configuration of a control circuit for the rotary electric machine according to the above embodiment.

FIG. 4 is a circuit diagram showing an inverter and a power supply portion in the control circuit of the rotating electric machine.

FIG. 5 is a magnetic flux density B-magnetic field strength H characteristic diagram of a general permanent magnet.

FIG. 6 is an explanatory diagram showing a magnetic flux distribution when the magnetomotive forces of the permanent magnets of the inner and outer rotors are made equal in the above embodiment.

FIG. 7 is an explanatory diagram showing a magnetic flux distribution when the magnetomotive force of the permanent magnet of the inner rotor is increased in the above embodiment.

FIG. 8 is a circuit diagram of an equivalent electric circuit for the magnetic circuit of the above embodiment.

FIG. 9 is a cross-sectional view of the stator according to the above embodiment and an explanatory view of a magnetic resistance model.

FIG. 10 is an explanatory diagram showing a magnetic flux distribution when the magnetomotive force of the permanent magnet of the inner rotor, which is a comparative example to the above-described embodiment of the present invention, is reduced.

[Explanation of symbols]

1 rotating electric machine 2 stator 3 outer rotor 4 Inner rotor 6 coils 7 core 8 gap 11 power supply 12 inverter 13,14 Rotation angle sensor 15 Control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-11-275826 (JP, A) JP-A-11-275827 (JP, A) JP-A-11-275828 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H02K 16/02 H02P 7/67

Claims (6)

(57) [Claims] 1. A rotor 2 containing magnets having different numbers of magnet pole pairs.
Two are arranged on the same rotation axis, a stator sharing a magnetic circuit for the two rotors is arranged between the two rotors, and a control current for driving each of the two rotors is combined with a coil of the stator. Is a rotating electric machine that rotates the two rotors independently by flowing the same, one rotor having a smaller number of magnet pole pairs than the other rotor.
And the magnetomotive force of the magnet provided on the one rotor is
Larger than the magnetomotive force of the magnet installed on the other rotor
A rotating electric machine characterized in that . 2. A magnet of a magnet provided on the one rotor.
The flux density is the magnetic flux density of the magnet provided on the other rotor.
The rotating electric machine according to claim 1, wherein the rotating electric machine is larger than the degree . 3. The thickness of the magnet of the other rotor
The thickness of the magnet on one of the rotors is increased.
The rotating electric machine according to claim 1 or 2, which is a characteristic of the rotating electric machine. 4. The two rotors are inside the stator.
Located inside the rotor and outside the stator
An outer rotor that is, the SL one rotor is said inner rotor, the other
The rotor is the outer rotor.
The rotary electric machine according to any one of claims 1 to 3 . 5. The rotating electric machine according to claim 4, wherein a stator coil provided on the stator is provided closer to an outer peripheral side. 6. The outer rotor and the inner rotor are:
Claims, characterized in that a PM type 1 to claim 5
The rotating electrical machine according to any one of 1 .