JP3506096B2 - 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 composite type rotating electric machine having two rotors, and more particularly to a structure suitable for operating one rotor as a generator and the other rotor as a motor.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Application Publication No. H11-11011 discloses a composite type rotating electric machine.
There is an apparatus described in Japanese Patent Laid-Open No. 275826 (invention by the applicant of the present application). This rotary electric machine has a structure in which a hollow-cylindrical outer rotor and an inner rotor are arranged with a predetermined gap inside and outside a hollow-cylindrical stator. The outer rotor shaft and the inner rotor shaft are arranged so as to be aligned on the same axis, and the outer rotor and the inner rotor are coaxially rotatable independently of each other (details will be described later with reference to FIG. 3). The two rotors can be independently controlled by controlling the composite current flowing through the coils provided in the stator so that the same number of rotating magnetic fields as the number of the rotors are generated. In the above publication, the pole pair ratio of the two rotors is 1: 1 pole pair ratio, 3: 1 pole pair ratio,
It is described that it can be established as a rotating electrical machine in the case of a 2-to-1 pole-log ratio. The pole pair number ratio indicates the ratio of the number of magnetic pole pairs (one pair of N and S) of one rotor and the other rotor. For example, when the number of magnetic pole pairs (NS) of one rotor and the number of magnetic pole pairs of the other rotor are the same (1: 1 pole pair number ratio) (NS1 set and NS1 set or NS2 set and NS2 set),
The 3-to-1 pole pair ratio means a case where one rotor is NS3 or 6 pairs and the other rotor is NS 1 or 2 pairs (all pole pair ratios are 3: 1). In the above rotary electric machine, when one rotor is operated as a generator and the other rotor is operated as a motor, or when it is operated as a so-called hybrid system, a current corresponding to the difference between the generated power and the motor drive power is shared. Since it only has to be passed through the coil, the efficiency can be greatly improved.

[0003]

In the rotating electric machine as described above, in the structure of 1: 1 pole / log ratio, there is a magnetic coupling effect, so that both rotors are rotated at the same speed (rotational angular speed ω1 = ω2). In the case of (hereinafter, referred to as a synchronous state), there is an advantage that it is possible to drive in a direct connection state without passing a current through the coil of the stator (magnetic coupling mode: details will be described later). However, the rotor reverses (2
There is also a reverse rotation mode (details will be described later) in which individual rotors rotate in mutually opposite directions), so there is a problem that it is difficult to configure a so-called hybrid motor. On the other hand, in the configuration of n: 1 pole / log ratio, there is no reverse rotation mode, but there is no magnetic coupling effect, so it is not possible to drive in a direct connection state without passing a current through the stator coil. Also, when a large current flows, the induced electromotive force rises, and its value is 1/100 of the power supply voltage.
If the number is 2 or more, there is a problem that the power source inverter cannot be driven and power cannot be supplied.

The present invention has been made in order to solve the above problems, and has a combination of a function capable of being driven directly by a magnetic coupling and a function capable of independently controlling the rotation of each rotor, and two rotors. It is an object of the present invention to provide a rotating electric machine that can drastically reduce electric power in a synchronized state in which the two rotate at the same speed.

[0005]

In order to achieve the above object, the present invention is constructed as described in the claims. That is, in the invention described in claim 1, the two rotors have a number n of permanent magnets forming magnetic poles.
Equivalent to the magnetic pole having the smaller number of pole pairs by setting the ratio of poles to one pole (n = an integer of 2 or more), and by setting the strength of the magnetic pole having the larger number of pole pairs to reduce the number of magnetic poles equivalently. To 1
A pole-to-pole ratio is enabled, and by controlling the current flowing through the stator coil, the pole-to-pole ratio can be switched between the pole-to-pole ratio and the pole-to-pole ratio. For example, when operating as a rotating electrical machine with an n: 1 pole / log ratio, a composite current corresponding to n: 1 is applied to the stator coil, and when operating with a 1: 1 pole / log ratio, a current corresponding to that is applied. Good.

In order to equivalently reduce the number of pole pairs as described above, for example, as described in claim 2, the magnetomotive force of the magnet is increased or decreased in the magnetic pole having the larger number of pole pairs, or As described in No. 3, it can be realized by providing a difference in the gap between the rotor and the stator or by embedding a magnetic material having a high magnetic permeability in the vicinity of the gap of the magnetic pole to be strengthened.

[0007]

In the rotary electric machine of the present invention, when applied to a hybrid drive system for a vehicle, when the internal combustion engine is started or started, the controllability is improved by operating the compound current as a normal n: 1 pole / log ratio. Can be improved. Further, when the driving side and the driven side rotate at the same speed in a synchronized state, energy is directly transferred between the two rotors by the magnetic coupling, so driving with extremely low current and low loss must be performed. Can be done. Therefore, the loss in the synchronous state can be significantly reduced, and the induced electromotive force is reduced, so that the operating range can be expanded to high rotation in the synchronous state. Furthermore, since the supply current in the synchronized state can be reduced, iron loss, copper loss, inverter loss can be significantly reduced, and the like.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION First, as an example of a rotating electric machine to which the present invention is applied, Japanese Patent Laid-Open No. 11-2 filed by the present applicant before.
The structure of the rotary electric machine described in Japanese Patent No. 75826 and its drive circuit will be described.

FIG. 3 is a view showing the structure of the rotating electric machine described in the above publication, (a) is a schematic sectional view of the entire rotating electric machine,
(B) is a sectional view of the rotor and the stator portion [A- in (a)]
A'sectional view, but showing only the rotor and the stator, excluding the shaft and the outer frame part]. Note that FIG. 3 shows a case where the number of magnetic poles of the outer rotor is 4, the number of magnetic poles of the inner rotor is 2, and the ratio of the number of magnetic poles is 2: 1. The number of pole pairs, which is the number of magnetic pole pairs (one pair of N and S) provided on the rotor, indicates that the outer rotor has two pole pairs and the inner rotor has one pole pair.
And the ratio of the pole pairs, which is the ratio of the two, is also 2: 1.

In FIG. 3, a hollow cylindrical outer rotor 3 and an inner rotor 4 are arranged with a predetermined gap between the outer and inner sides of a hollow cylindrical stator 2 to form a three-layer structure. The inner rotor shaft 9 and the outer rotor shaft 10 are provided so as to be aligned on the same shaft, and the inner rotor 4 and the outer rotor 3 are coaxially rotatable independently of each other. The bearings and the like are not shown.

The inner rotor 4 has an S pole on one half and an N pole on the other half.
The outer rotor 3 is formed of a pair of permanent magnets, and the outer rotor 3 is arranged such that the inner rotor 4 has twice as many poles as one pole. That is, the outer rotor 3
There are two S poles and two N poles, and the S pole and the N pole are configured to be switched every 90 degrees. By arranging the magnetic poles of the rotors 3 and 4 in this way, the magnet of the inner rotor 4 is not given a rotational force by the magnet of the outer rotor 3,
On the contrary, the magnet of the outer rotor 3 is not given a rotational force by the magnet of the inner rotor 4.

For example, consider the influence of the magnets of the inner rotor 4 on the outer rotor 3. For simplicity, consider the inner rotor 4 fixed. First, in the relationship between the S pole of the inner rotor 4 and the upper magnet SN of the outer rotor 3 facing it, the magnetic force generated by the S pole of the inner rotor 4 in the illustrated state causes the upper magnet SN of the outer rotor to move. If an attempt is made to rotate in the clockwise direction, in the relationship between the N pole of the inner rotor 4 and the lower magnet SN of the outer rotor 3 facing it,
Due to the N pole of the inner rotor 4, the lower magnet SN of the outer rotor 3
Tries to rotate counterclockwise. That is, the magnetic force exerted by the S pole of the inner rotor 4 on the upper magnet of the outer rotor 3 and the magnetic force exerted by the N pole of the inner rotor 4 on the lower magnet of the outer rotor 3 cancel each other, and the outer rotor 3 is The control can be performed only by the relationship with the stator 2 and not the relationship with the rotor 4. This is the same between the rotating magnetic field generated in the stator coil and the rotor as described later.

The coil of the stator 2 is a coil of the outer rotor 3.
It consists of 3 coils 6 per magnetic pole, totaling 12 (=
3 × 4) coils 6 are evenly arranged on the same circumference. Circled numbers indicate the winding of the coil,
For example, 1 and 1 form one coil, and the directions of the currents are opposite to each other. That is, 1 is a winding wire through which a current flows, and 1 is a winding wire through which a current flows in the opposite direction. The winding method in this case is concentrated winding.

Reference numeral 7 denotes a core around which a coil is wound, and the same number of cores 7 as the coils 6 are arranged on the circumference of the core at regular intervals (gap) 8. As will be described later, the twelve coils are distinguished by numbers, and in this case, the coil 6 comes out to mean the sixth coil. Although it is confusing with the expression of the coil 6, the meaning is different.

The following composite currents I _{1 to} I ₁₂ are passed through these 12 coils. First, in order to flow a current (three-phase alternating current) that generates a rotating magnetic field for the inner rotor 4,
[1,2] = [7, 8], [3, 4] = [9,10],
Currents Id, If, and Ie whose phases are shifted by 120 degrees are set in three sets of coils of [5, 6] = [ 11 , 12 ]. Here, the underline under the number means 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 directed from the coil 1 to the coil 7 and a current Id is directed from the coil 2 to the coil 8. It is equivalent to flowing the other half of the current. Since 1 and 2 and 7 and 8 are close to each other on the circumference, this current supply makes it possible to generate the same number (two poles) of rotating magnetic fields as the magnetic poles of the inner rotor 4.

Next, a rotating magnetic field is generated for the outer rotor 3.
[1] = [to generate current (three-phase alternating current)Four]
= [7] = [10], [2] = [5] = [8] = [1
1], [3] = [6] = [9] = [12] 3 sets of carp
Currents Ia, Ic, and Ib that are out of phase by 120 degrees
Set. For example, a set of coils [1] = [Four] =
[7] = [10To flow the current Ia from the coil 1
coilFourCurrent from Ia and from coil 7 to coil10To
It is equivalent to flowing the current of Ia even when facing. With coil 1
7, coilFourWhen10Are 180 degrees apart on the circumference
The outer rotor is
It is possible to generate the same number (4 poles) of rotating magnetic field as 3 magnetic poles.
it can. As a result, the following composite currents are applied to the 12 coils.
I₁~ I₁₂It would be good if you shed. I₁= (1/2) Id + Ia I_Two= (1/2) Id +I c I_Three= (1/2)If＋ Ib I_Four= (1/2)If+Ia I₅= (1/2) Ie + Ic I₆= (1/2) Ie ＋Ib I₇= (1/2)Id＋ Ia I₈= (1/2)Id+I c I₉= (1/2) If + Ib I₁₀= (1/2) If +Ia I₁₁= (1/2)Ie+I c I₁₂= (1/2)Ie＋ Ib However, the underline below the current symbol is in the opposite direction.
It indicates that the current is.

The setting of the composite current will be further described with reference to FIG. 4. In FIG. 4, for comparison with FIG. 3, separate rotating magnetic fields are provided to the inner and outer peripheral sides of the stator 2 for each rotor. It has a dedicated coil to generate it. That is,
The inner side coils d, f, e generate a rotating magnetic field for the inner rotor, and the outer side coils a, c, b generate a rotating magnetic field for the outer rotor. In this case, in order to reconfigure the two dedicated coils in common and reconfigure them into the common coil shown in FIG. 3, half of the current flowing through the coil d among the inner circumference side coils is near the coil d. The coils a and c are loaded, and in the same manner, half of the current flowing through the coil f is applied to the coils b and a near the coil f, and the coil e
Half of the current flowing in the coil c near the coil e
And b should be burdened. The composite current I ₁
The formulas to I ₁₂ represent the above idea in a mathematical formula. Note that the current setting method is not limited to this, and other current setting methods may be used as described in JP-A-11-275826.

When the current is set in this manner, 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, although the common coil is used. The rotating magnetic field for the rotor 3 does not give a rotating force, and the magnet of the outer rotor 3 does not have a rotating force for the inner rotor 4. This point is described in JP-A-1
It has been proved by theoretical analysis as described in JP-A 1-275826.

The currents Id, If, and Ie are set in synchronization with the rotation of the inner rotor 4, and the currents Ia, Ic, and Ib are 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.

FIG. 5 is a block diagram of a circuit for controlling the rotating electric machine. In order to supply the composite currents I _{1 to} I ₁₂ to the stator coil, an inverter 12 that converts a direct current from a power source 11 such as a battery into an alternating current is provided. Since the sum of all the instantaneous currents becomes 0, this inverter 12 is the same as the normal 3-phase bridge type inverter with 12 phases, as shown in detail in FIG.
It is composed of (= 12 × 2) transistors Tr1 to Tr24 and the same number of diodes as these transistors. The ON and OFF signals given to each gate (base of the transistor) of the inverter 12 are PWM signals.

Rotation angle sensors 13 and 14 for detecting the phases of the rotors 3 and 4 in order to rotate the rotors 3 and 4 synchronously.
In the control circuit 15 in which the signals from the sensors 13 and 14 are input, the outer rotor 3 and the inner rotor 4 are provided.
A PWM signal is generated on the basis of the required torque (positive / negative) data (required torque command) for.

In this way, the above-mentioned Japanese Patent Laid-Open No. 11-27582 is used.
In the rotating electric machine described in Japanese Patent Publication No. 6, two rotors 3 and 4 and one stator 2 are configured in a three-layer structure and on the same shaft, and a coil 6 common to the stator 2 is formed. Since the composite current is made to flow in the 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 suffices to flow a current corresponding to the difference between the motor driving power and the generated power to a common coil, so that the efficiency can be significantly improved.

Also, one inverter is sufficient for two rotors, and one of the rotors is used as a motor.
When the rest is operated as a generator, as described above, it suffices to pass a current corresponding to the difference between the motor drive power and the generated power to a common coil, so the capacitance of the power switching transistor of the inverter can be reduced. This can improve the switching efficiency and further improve the overall efficiency.

In the above description, the case where the pole log ratio is 2: 1 has been mainly described, but when the pole log ratio is 1: 1,
That is, when the outer rotor and the inner rotor have the same number of pole pairs, a special operation characteristic occurs. This will be described below. The formulas (8) and (9) in the above-mentioned Japanese Patent Laid-Open No. 11-275826 are as follows. f ₁ = -μIm ₁ {Im ₂・ sin ((ω ₂ -ω ₁ ) t-α)-(3/2) n ・ Ic ・ sin (β)} (8) f ₂ = μIm ₂ {Im ₁・ Sin ((ω ₁ -ω ₂ ) t-α)-(3/2) n ・ Ic ・ sin ((ω ₁ -ω ₂ ) t-α-β)} (9) However, f ₁ : outside Rotor drive force f ₂ : Inner rotor drive force Im ₁ : Outer rotor magnet equivalent DC current Im ₂ : Inner rotor magnet equivalent DC current Ic: Stator coil current ω ₁ : Outer rotor rotational angular velocity ω ₂ : Rotational angular velocity of the inner rotor α: Phase angle of magnetic poles of the two rotors β: Phase difference of current μ: Permeability n: Coil constant In the above equations (8) and (9), first, a rotating magnetic field is applied to the stator coil. Considering the driving forces f ₁ and f ₂ of both rotors when the generated current Ic is passed.

Since the driving forces f ₁ and f ₂ due to the current Ic · sin β of the stator coil change depending on the phase angle α between the outer rotor and the inner rotor, hereinafter, in the case of α = 0 and α =
Description will be made separately for the case of π. Note that α = 0 means that in FIG.
As shown in (a), the magnetic poles of the two rotors have the same pole (N-
N = SS), and α = π means that the magnetic poles of the two rotors are different (N) as shown in FIG. 7B.
-S) is a state of facing each other.

To simplify the equation, if ω ₁ = ω ₂ , then from equations (8) and (9), f ₁ = -μIm ₁ {Im ₂ · sin (-α)-(3 / 2) n ・ Ic ・ sin (β)} (Equation 1) Formula f ₂ = μIm ₂ {Im ₁・ sin (-α)-(3/2) n ・ Ic ・ sin (-α-β)} ... (Equation 2) When α = 0 When (Equation 1) and (Equation 2) are set to α = 0, the following (Equation 3) and (Equation 4) are obtained. f ₁ = -μIm ₁ {-(3/2) n ・ Ic ・ sin (β)} = μIm ₁・ (3/2) n ・ Ic ・ sin (β) ... (Equation 3) Formula f ₂ = μIm ₂ {-(3/2) n · Ic · sin (-β)} = μIm ₂ · (3/2) n · Ic · sin (β) ... (Equation 4) If μIm ₁ = μIm ₂ , f ₁ = f ₂ . As described above, when α = 0, f ₁ = f ₂ , so that
The two rotors receive driving force in the same direction and rotate in the same direction.

When α = π When α = π in the equations (1) and (2), the following equations (5) and (6) are obtained. f ₁ = μIm ₁・ (3/2) n ・ Ic ・ sin β (Equation 5) f ₂ = μIm ₂・ (3/2) n ・ Ic ・ sin (-π-β) =-μIm ₂・ ( 3/2) n · Ic · sin β (Equation 6) If μIm ₁ = μIm ₂ is established, then f ₁ = −f ₂ .
As described above, when α = π, f ₁ = −f ₂ , so that the two rotors receive driving force in opposite directions and rotate in opposite directions. This is the reverse mode. When the stator coil is driven by passing a current as described above, there are a normal rotation mode and a reverse rotation mode depending on the value of the phase angle α.

Next, the case where no current flows through the stator coil, that is, the case where Ic = 0, will be described. Ic =
In the case of 0, the following (Equation 7) is obtained from the equations (8) and (9).
The formula becomes like the formula (8). f ₁ = -μIm ₁ {Im ₂ · sin ((ω ₂ −ω ₁ ) t-α)} (Equation 7) Formula f ₂ = μIm ₂ {Im ₁ · sin ((ω ₁ −ω ₂ ) t- α)} (Equation 8) Equation (Equation 7) Equation (Equation 8) If ω ₁ = ω ₂ , f ₁ = -μIm ₁ {Im ₂ · sin (-α)} (Equation 9) Expression f ₂ = μIm ₂ {Im ₁ · sin (−α)} (Equation 10) Expression, and always f ₁ = −f ₂ . At first glance, this seems to rotate in the opposite direction, but in reality, when the phase angle α is given between the two rotors, it actually indicates the force to return to the position of α = 0. That is, when a mechanical force is externally applied to one rotor, α deviates from 0, and a force f ₁ for correcting this is generated, and similarly, a force f ₂ on the opposite side, which is the correction direction, is also applied to the other rotor. Is to work. Therefore, when one of the rotors is mechanically rotated from the outside, the other rotor also has α = 0.
Will rotate in the same direction to keep. This is the magnetic coupling, and when the outer rotor is driven by the internal combustion engine, for example, in the state where no current flows in the stator coil,
The inner rotor can be rotated in the same direction.

In the case of the one-to-one pole logarithmic ratio as described above,
If one rotor is mechanically driven from the outside with the phase angle α = 0 and no current is applied to the stator coil, the magnetic coupling mode is reached, and the other rotor is directly connected without applying current to the stator coil. It can be driven at the same speed. Also, the phase angle α of the magnets of the two rotors =
In the case of π, the reverse rotation mode is set, and the outer rotor and the inner rotor rotate in opposite directions.

A hybrid electric machine as described above is mounted on a hybrid vehicle, one rotor is driven by an internal combustion engine to generate electric power, and the electric power is supplied to a stator coil to rotate the other rotor. In the driving system, when the internal combustion engine is configured to start using the rotor coupled to the internal combustion engine as a starter motor when the internal combustion engine is started, the vehicle and the internal combustion engine are both stopped and coupled to the vehicle. When the rotor is rotated to drive the vehicle, the rotor coupled to the internal combustion engine may also rotate. Conversely, if the rotor coupled to the internal combustion engine rotates when the internal combustion engine is started, the rotor coupled to the other wheel also rotates, which may cause the vehicle to move, which is an undesirable characteristic. The present invention takes advantage of the advantageous characteristic of the magnetic coupling that it can be driven without passing an electric current, and is improved so as to suppress the undesirable characteristic.

Embodiments of the present invention will be described below. 1A and 1B are cross-sectional views of a rotor and a stator portion of a rotary electric machine used in a first embodiment of the present invention, where FIG. 1A shows an actual configuration and FIG. 1B shows an equivalent configuration. The schematic sectional view of the entire rotating electric machine is similar to that shown in FIG. Figure 1 (a)
As shown in FIG. 3, the outer rotor 21 has a three-pole pair, the inner rotor 23 has a one-pole pair, and has a three-to-one magnetic pole contrast ratio. However, the magnet of the outer rotor 21 has a structure in which one side has a weak south pole on both sides of a strong north pole, and the other has weak north poles on both sides of a strong south pole. If the strength of the magnetomotive force of the stronger N pole or S pole is larger than the strength of the magnetomotive force of the other two S poles or N poles, as shown in FIG. , Which is equivalent to having one N pole and one S pole, and becomes one pole pair. Therefore, equivalently, both the outer rotor 21 and the inner rotor 23 have one pole pair, and have a 1: 1 magnetic pole contrast ratio.

In the structure as described above, the stator 2
The stator coil provided in No. 2 has a 3: 1 ratio as described above.
If a composite current corresponding to the magnetic pole contrast is passed, the rotor operates as a rotating electric machine having a 3: 1 magnetic pole contrast, and the outer rotor 21 and the inner rotor 23 can be independently controlled. Further, as described above, when both rotors are synchronously rotated by utilizing the magnetic coupling effect, they operate as a rotating electric machine having a 1: 1 magnetic pole pair number ratio. Although the above example shows a configuration that can be used for both a 3: 1 magnetic pole ratio and a 1: 1 magnetic pole number ratio, in general, an n: 1 magnetic pole ratio (n is an integer of 2 or more) and a 1: 1 magnetic pole are used. It can be used as a logarithmic ratio.

As described above, the rotary electric machine of the present invention can switch and use two characteristics, and is therefore suitable for a so-called hybrid drive vehicle. For example, in FIG.
(A) An internal combustion engine is connected to the outer rotor shaft 10 to drive the outer rotor 3 to operate as a generator, and the inner rotor shaft 9 is connected to a drive system of the vehicle to drive the vehicle by using the inner rotor 4 as an electric motor. To do. In such a configuration, when operating as a rotating electric machine with the above-mentioned 3: 1 magnetic pole ratio, if the inner rotor 4 is rotated by the electric power generated by the outer rotor 3, any speed not restricted by the speed of the outer rotor 3 is generated. The vehicle can be driven at speed. Further, when operating as a rotating electric machine having the above-mentioned 1: 1 magnetic pole pair ratio, the inner rotor 4 can be rotated at the same speed as the outer rotor 3 due to the magnetic coupling effect. In this case, the power consumption can be extremely reduced by utilizing the magnetic coupling effect.

As described above, in order to mix the strong magnetic pole and the weak magnetic pole, the following three methods can be considered. (1) Method of giving a difference in magnetomotive force of magnets By increasing the magnetomotive force of the portion forming the strong magnetic pole and decreasing the magnetomotive force of the portion forming the weak magnetic pole, a strong magnetic pole and a weak magnetic pole can be formed. (2) Method of providing a difference in the gap Even if the magnetomotive forces are the same, the strength of the magnetic pole changes in practice if the size of the gap between the rotor and the stator is changed. Therefore, a strong magnetic pole and a weak magnetic pole can be formed by reducing the magnetic pole gap for strengthening and increasing the magnetic pole gap for weakening. (3) Method of embedding a magnetic material having a high magnetic permeability near the gap of the magnetic pole to be strengthened By embedding a magnetic material having a high magnetic permeability, the magnetic pole can be strengthened.

Next, FIG. 2 is a block diagram showing a control system in the rotating electric machine of the present invention. In FIG. 2, 24 is a rotation angle sensor that detects the phase (rotor position) of the outer rotor 21, and 25 is a rotation angle sensor that detects the phase of the inner rotor 23. Further, the torque control device 26 includes an inter-rotor torque calculation unit 27, a torque command value calculation unit 28, an output current calculation unit 29, a PWM pattern generation unit 30, and a gate signal generation unit 31. Further, 32 is an inverter, and 33 is a current sensor.

The operation will be described below. In the rotary electric machine of the present invention, as shown in FIG. 1 (a), the magnetic force of each magnetic pole of the outer rotor 21 is set. Therefore, in an asynchronous state in which the outer rotor 21 and the inner rotor 23 rotate at different speeds, torque fluctuations depending on the strength of the magnetic poles occur depending on the mutual positions of the magnetic poles. Therefore, in order to eliminate the torque fluctuation, it is necessary to control the current flowing through the stator coil according to the rotation angle of the rotor.

In FIG. 2, in the asynchronous state, the phases (positions) of the two rotors detected by the rotation angle sensors 24 and 25.
Based on the information, the inter-rotor torque calculation unit 27 determines 2
Calculate the torque between individual rotors. Next, in the torque command value calculation unit 28, the difference between the inner rotor torque command value S1 and the outer rotor torque command value S2 given from the outside and the above-described calculated inter-rotor torque is obtained, so that the composite current of the stator is actually obtained. The torque command value corresponding to the torque to be generated is calculated. Next, the output current calculator 2
In 9, the output current value corresponding to the composite current supplied to the stator coil is calculated according to the calculated torque command value. Next, the gate signal creation unit 31 creates and outputs a PWM gate signal from the signal (for example, a triangular wave signal) sent from the PWM pattern generation unit 30 and the above output current value. Inverter circuit 3 with the above gate signal
A current is supplied to the stator coil provided in the stator 22 by controlling ON / OFF of the second switching element.

By performing the control as described above, when the outer rotor 21 and the inner rotor 23 are independently controlled in an asynchronous state, a normal 3-to-1 ratio is achieved without causing torque fluctuations.
It can be operated as a rotating electrical machine with a pole-log ratio.

Next, the same control as above is carried out even in the synchronous state in which the outer rotor 21 and the inner rotor 23 rotate at the same speed, but when operating at a 1: 1 magnetic pole pair ratio,
Since the magnetic coupling effect as described above occurs, the current flowing through the stator coil can be greatly reduced. For example, in a structure in which the outer rotor 21 is driven by an internal combustion engine and the vehicle is driven by the inner rotor 23, the torque required to drive the vehicle is the torque due to the magnetic coupling effect (the inter-rotor torque calculation unit 27). If the torque is smaller than the torque between the two rotors obtained in step 1, the inner rotor 23 can be rotated without passing a current through the stator coil. When the drive torque required for the inner rotor 23 becomes larger than the torque due to the magnetic coupling effect, the corresponding current is supplied to the stator coil.

Further, when a large current flows through the stator coil, the induced electromotive force rises, and when the value becomes more than 1/2 of the power supply voltage, the inverter circuit of the power supply becomes inoperable and power cannot be supplied. However, in the present invention, the value of the supplied current is significantly reduced as described above, so the induced electromotive force due to the current flowing through the stator coil is also reduced. Therefore, in the synchronous state, the operating range can be expanded to the high speed range.

Next, pulling from the asynchronous state to the synchronous state will be described. When one of the rotors is a drive source and the other rotor is in a driven state, for example, in the case where the outer rotor 21 is driven by the internal combustion engine and the vehicle is driven by the inner rotor 23 as described above, When increasing the torque of the driven rotor, the rotation speed is calculated based on the rotor phase information detected by the rotation angle sensors 24 and 25, regardless of the torque command value. When there is a difference in rotational speed, the current in the stator coil is adjusted over a predetermined time to control the rotor torque on the driven side until the rotational speed difference becomes zero. When the rotational speed difference becomes zero, the inter-rotor torque calculation unit 27 calculates the torque on the driven side from the rotor positions detected by the rotation angle sensors 24 and 25, and the stator coil current is increased to a position where the torque becomes maximum. Adjust and position. After that, the control method of the synchronous state is followed.

On the contrary, when reducing the torque of the driven rotor, the rotation speed is calculated based on the rotor phase information detected by the rotation angle sensors 24 and 25, regardless of the torque command value. When there is a difference in rotational speed, the current in the stator coil is adjusted over a predetermined time to control the rotor torque on the driven side until the rotational speed difference becomes zero. When the rotational speed difference becomes zero, the inter-rotor torque calculation unit 27 calculates the torque on the driven side from the rotor positions detected by the rotation angle sensors 24 and 25, and the stator coil current is calculated until the torque becomes minimum. Adjust and position. After that, the control method of the synchronous state is followed.

When the rotary electric machine of the present invention is applied to a hybrid drive system for a vehicle as described above, control is performed by operating the compound current as a normal n: 1 pole / log ratio when the internal combustion engine is started or started. It is possible to improve the sex. Further, when the driving side and the driven side rotate at the same speed in a synchronized state, energy is directly transferred between the two rotors by the magnetic coupling, so driving with extremely low current and low loss must be performed. Can be done. Therefore, the loss in the synchronous state can be significantly reduced, and the induced electromotive force is reduced, so that the operating range can be expanded to high rotation in the synchronous state. Furthermore, since the supply current in the synchronized state can be reduced, iron loss, copper loss, and inverter loss can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rotor and a stator portion of a rotating electric machine used in a first embodiment of the present invention, (a) showing an actual configuration and (b) a diagram showing an equivalent configuration.

FIG. 2 is a block diagram showing a control system in the rotating electric machine of the present invention.

3A and 3B are diagrams showing a structure of an example of a rotating electric machine to which the present invention is applied, FIG. 3A is a schematic sectional view of the entire rotating electric machine, and FIG.
Is a sectional view of a rotor and a stator portion.

FIG. 4 is a schematic cross-sectional view of a rotating electric machine body in which dedicated coils are arranged on the inner peripheral side and the outer peripheral side of a stator 2.

FIG. 5 is a block diagram of a circuit for controlling the rotating electric machine.

FIG. 6 is a circuit diagram of an example of an inverter.

FIG. 7 is a diagram showing a phase angle α of rotation between an outer rotor and an inner rotor in the case of a rotating electrical machine having a 1: 1 magnetic pole pair ratio.

[Explanation of symbols]

21 ... Outer rotor 22 ... Stator 23 ... Inner rotor 24 ... Rotation angle sensor 25 ... Rotation angle sensor 26 ... Torque control device 27 ... Rotor torque calculation unit 28 ... Torque command value calculation unit 29 ... Output current calculation unit 30 ... PWM
Pattern generator 31 ... Gate signal generator 32 ... Inverter circuit 33 ... Current sensor S1 ... Outer rotor torque command value S2 ... Inner rotor torque command value

Claims (7)

(57) [Claims] 1. A rotor comprising two rotors sharing a stator coil with a magnetic circuit, the stator coil corresponding to each rotor.
Is a rotating electric machine that controls to generate a rotating magnetic field of the same number as the number of the rotors by supplying a combined current that is added to the rotating rotors. The two rotors have n pairs of permanent magnets forming magnetic poles. One pole pair ratio (n = integer of 2 or more) is set, and the magnetic pole having the larger number of pole pairs is provided with strength and weakness, and the number of magnetic poles is reduced equivalently. The 1: 1 pole-logarithm ratio is made possible, and by controlling the current flowing through the stator coil, the 1: 1 pole-logarithm ratio and n
A rotating electric machine characterized in that it can be driven by switching to a pole ratio to one pole. 2. The rotation according to claim 1, wherein the magnetic pole having the larger number of pole pairs is configured to equivalently reduce the number of pole pairs by providing the magnetomotive force of the magnet with strength. Electric machinery. 3. The magnetic pole having the larger number of pole pairs is equivalently provided by providing a difference in the gap between the rotor and the stator or by embedding a magnetic material having a high magnetic permeability in the vicinity of the gap between the magnetic poles to be strengthened. The rotary electric machine according to claim 1, wherein the rotary electric machine is configured to reduce the number of pole pairs. 4. In a synchronous state in which the two rotors rotate at the same speed, the inter-rotor torque generated by the magnets of the two rotors is calculated as a function of the two rotor positions and required. 4. A means for controlling the electric power supplied to the stator coil so as to generate a torque corresponding to the difference between the value of the generated torque and the torque between the rotors, according to any one of claims 1 to 3. The rotating electric machine described in. 5. In an asynchronous state in which the two rotors rotate at different speeds, the inter-rotor torque generated by the magnets of the two rotors is calculated as a function of the two rotor positions, 5. The rotating electric machine according to claim 1, further comprising means for controlling the electric power supplied to the stator coil so as to cancel the torque pulsation caused by the inter-torque. 6. Pulling from an asynchronous state to a synchronous state comprises:
When one rotor is connected to a drive source and the other rotor is in a driven state and the torque of the rotor in the driven state is to be increased, the driven current is adjusted by adjusting the current of the stator coil. The rotor torque in the state is controlled until the rotational speed difference becomes zero, and when the rotational speed difference becomes zero, the current of the stator coil is adjusted to the position where the rotor torque in the driven state becomes the maximum. The rotary electric machine according to any one of claims 1 to 5, further comprising means for performing a synchronization control by stopping the positioning control after the completion of the positioning. 7. Pulling from an asynchronous state to a synchronous state comprises:
When one rotor is connected to the drive source and the other rotor is in the driven state and the torque of the rotor in the driven state is reduced, the current in the stator coil is adjusted to drive the driven rotor. The rotor torque in the state is controlled until the rotational speed difference becomes zero, and when the rotational speed difference becomes zero, the current of the stator coil is adjusted to the position where the torque in the driven state is minimized to perform positioning. The rotating electric machine according to any one of claims 1 to 5, further comprising means for bringing the control into a synchronized state by stopping the positioning control after the completion of the positioning.