CN102170212B

CN102170212B - Permanent magnet type rotating motor

Info

Publication number: CN102170212B
Application number: CN2011101046992A
Authority: CN
Inventors: 堺和人; 新政宪
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2006-08-23
Filing date: 2006-08-23
Publication date: 2012-07-18
Anticipated expiration: 2026-08-23
Also published as: CN102170212A

Abstract

The invention aims at providing a permanent magnet type rotating motor which can be operated with high output in a variable speed way in a large range from low speed to high speed, so as to improve the efficiency and the reliability of the permanent magnet type rotating motor. The permanent magnet type rotating motor is provided with a stator and a rotor, wherein the stator is provided with a stator winding, the rotor is provided with a permanent magnet with low coercive force with irreversible changed magnetic flux density and a permanent magnet with high coercive force which is more than two times than the low coercive force through a magnetic field generated by current of the stator winding. In the permanent magnet type rotating motor, in order to reduce total interlinking magnetic flux generated by the permanent magnet with low coercive force and the permanent magnet with high coercive force in a high-speed rotating area with more than the maximum power voltage, the permanent magnet with low coercive force is magnetized through the magnetic field formed by the current, so as to adjust the total interlinking magnetic flux.

Description

Permanent magnet rotary electric machine

The application is that to be called " permanent magnet rotary electric machine ", international filing date be that August 23, international application no in 2006 are to be for PCT/JP2006/316510, national applications number dividing an application of 200680055648.2 application for a patent for invention to name.

Technical field

The present invention relates to permanent magnet rotary electric machine.

Background technology

Generally, permanent magnet motor is divided into two types roughly.Be with permanent magnet stick on rotor core periphery surperficial magnet type permanent magnet motor and with the baried type permanent magnet motor in the permanent magnetic baried rotor core.Use motor as variable speed drive, the baried type permanent magnet motor is suitable.

Use Figure 19, the formation of the rotor of baried type permanent magnet motor is described.In Figure 19,11 expression rotors, 12 expression rotor cores, 14 expression high-coercivity permanent magnets.At the peripheral part of rotor core 12, the rectangular cavity that quantity is number of poles only is set to divide equally spacing.Figure 19 is the rotor 11 of four utmost points, and four cavities are set, and permanent magnet 14 is inserted.Permanent magnet 14 is at the radial direction of rotor, and perhaps the limit rectangular direction relative with air-gap surface is magnetized in the rectangle in the cross section of permanent magnet 14.For not because of the load current demagnetization, the permanent magnet 14 main high NdFeB permanent magnets of coercive forces etc. of using.Rotor core 12 is that the electromagnetic steel plate lamination of having given a farfetched interpretation empty is formed.Example in the past like this is recorded in " " imbedding the design and the control of magnet syncmotor ", the inferior work of Wu Tianyang, the distribution of オ one system company ", and in addition, the variation of baried type is recorded in the spy and opens in the flat 7-336919 communique.In addition, as the motor of the height of variable-ratio excellent output, have the spy open flat 11-27913 communique, the spy opens the permanent magnet style reluctance rotary motor of putting down in writing in the flat 11-136912 communique.

In permanent magnet rotary electric machine, because the interlinkage flux of permanent magnet always produces regularly, so the induced voltage and the rotary speed that produce because of permanent magnet raise pro rata.Carrying out under the situation of variable-speed operation from low speed to high speed; When high speed rotating, high because of the induced voltage that permanent magnet produces, the induced voltage that produces because of this permanent magnet puts on the electronic component of inverter; If reach more than the proof voltage of electronic component, part insulation breakdown then.Therefore, considered that the magnetic flux that carries out permanent magnet is cut to the design below the proof voltage, still, reduced in the output and the efficient of the low-speed region of permanent magnet rotary electric machine.

Under the situation of carrying out from low speed to high speed,,, export necessary electric current and do not flow so in the high speed rotating zone, the voltage of electric rotating machine reaches the supply voltage upper limit because the interlinkage flux of permanent magnet is fixed near the fixing variable-speed operation of exporting.Its result is that at high-speed region, output significantly reduces, and has again, can not carry out the large-scale driving until high-speed region.Therefore, recently,, begin to be applied in the weak flux regulator of record in above-mentioned " imbedding the design and the control of magnet syncmotor " as the method that enlarges the variable-ratio scope.A little less than this, in the flux regulator, make the degaussing field that produces because of the d shaft current act on high-coercivity permanent magnet 4,, the magnetic operating point of permanent magnet is moved, make magnetic flux change in reversible scope.Therefore, a little less than carrying out, in the flux controlled baried type permanent magnet rotary electric machine, use permanent magnet as imbedding, using not can be because of the degaussing field NdFeB magnet of the high-coercivity of demagnetization irreversibly.

Because because the degaussing field of d shaft current, the interlinkage flux of permanent magnet reduces, so the reduction of interlinkage flux has generated the surplus capacity of voltage with respect to the upper voltage limit value.Like this, because can increase electric current, so, in the output increase of high-speed region.In addition, can make rotary speed only go up the up voltage surplus capacity, enlarge the scope of variable-speed operation.

But, need to continue permanent magnet is applied degaussing field, flow because the d shaft current that is helpless to export is always lasting, so copper loss increases, degradation in efficiency.Have, the degaussing field that produces because of the d shaft current has produced the higher harmonics magnetic flux again, the boundary that the increase of the voltage through generations such as higher harmonics magnetic fluxs has caused the voltage that produces because of weak flux regulator to reduce.Because these even weak flux regulator is applied in the baried type permanent magnet rotary electric machine, also are difficult to carry out the variable-speed operation more than three times of substrate velocity.Have, because above-mentioned higher harmonics magnetic flux, iron loss increases again, and owing to the electromagnetic force that produces because of the higher harmonics magnetic flux, produces vibration.

In addition, only using under engine-driven state under the situation of hybrid vehicle with CD-ROM drive motor in that the baried type permanent magnet motor is applied to, motor is in company with rotation.In high speed rotation, the permanent magnet of Yin Mada and the induced voltage that produces reaches more than the supply voltage through weak flux regulator, makes the d shaft current continue to flow.Because under this state, what motor produced only is loss, so comprehensive running efficiency worsens.

The baried type permanent magnet motor is being applied under the situation of Electric CD-ROM drive motor, electric car has the state of coasting, with above-mentioned same; Because make the induced voltage that produces because of permanent magnet below supply voltage; So,, make the d shaft current continue to flow through weak flux regulator.Because under this state, what motor produced also only is loss, so comprehensive running efficiency worsens.

Summary of the invention

The present invention is the invention that produces in view of the technological in the past problem points of above-mentioned that kind; Its objective is provides a kind of permanent magnet rotary electric machine; This permanent magnet rotary electric machine can provide a kind of from low speed to high speed carry out variable-speed operation on a large scale; The high moment of torsionization in low speed rotation zone and the height outputization of high speed rotary area are raised the efficiency, and improve reliability.

Permanent magnet rotary electric machine of the present invention is characterised in that to have: stator, and this stator is provided with stator winding; Rotor; Said rotor is in rotor core; Disposed and had the magnetic field that generates through electric current, the high-coercivity permanent magnet of the coercive force that the low coercive force permanent magnet of the coercive force of the degree that magnetic flux density irreversibly changes and the twice with above-mentioned low coercive force permanent magnet are above because of the said stator winding.

According to the present invention, can provide a kind of realized from low speed to high speed carry out variable-speed operation on a large scale, the high moment of torsionization and the height outputization of high speed rotary area in low speed rotation zone are raised the efficiency, the permanent magnet rotary electric machine of raising reliability.

Description of drawings

Fig. 1 is the cutaway view of the permanent magnet rotary electric machine of first execution mode of the present invention.

Fig. 2 is the cutaway view of rotor of the permanent magnet rotary electric machine of first execution mode of the present invention.

Fig. 3 is the figure that is illustrated in the magnetic characteristic of the low coercive force permanent magnet that uses in first execution mode of the present invention and high-coercivity permanent magnet.

Fig. 4 is the cutaway view of magnetic flux of permanent magnet of A-stage of the rotor of expression first execution mode of the present invention.

Fig. 5 is the cutaway view of the magnetic flux that attaches magnetic magnetic field that produces because of the d shaft current of the rotor of expression first execution mode of the present invention.

Fig. 6 is the cutaway view that attaches the magnetic flux after magnetic magnetic field plays a role that produces because of the d shaft current of the rotor of expression first execution mode of the present invention.

Fig. 7 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 8th execution mode of the present invention.

Fig. 8 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 9th execution mode of the present invention.

Fig. 9 is the cutaway view of rotor of the permanent magnet rotary electric machine of the tenth execution mode of the present invention.

Figure 10 is the figure with respect to the variation of the moment of torsion of the central angle alpha of magnetic pole of expression the tenth execution mode of the present invention.

Figure 11 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 12 execution mode of the present invention.

Figure 12 is the cutaway view of length direction of the low coercive force permanent magnet of the 12 execution mode of the present invention.

Figure 13 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 13 execution mode of the present invention.

Figure 14 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 14 execution mode of the present invention.

Figure 15 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 15 execution mode of the present invention.

Figure 16 A is the cutaway view of rotor of the permanent magnet rotary electric machine of the 16 execution mode of the present invention.

Figure 16 B is the cutaway view of the permanent magnet rotary electric machine of the 16 execution mode of the present invention.

Figure 17 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 17 execution mode of the present invention.

Figure 18 is the cutaway view of rotor of the permanent magnet rotary electric machine of the 18 execution mode of the present invention.

Figure 19 is the cutaway view of the rotor of baried type permanent magnet motor in the past.

Embodiment

Below, according to accompanying drawing, specify execution mode of the present invention.

(first execution mode) is like Fig. 1, shown in Figure 2; The rotor 1 of the permanent magnet rotary electric machine 20 of first execution mode of the present invention is through in rotor core 2, imbeds eight low coercive force permanent magnets 3 and eight high-coercivity permanent magnets 4 respectively and constitutes to divide equally spacing.At the inlet part of the low coercive force permanent magnet 3 of rotor core 2, form first cavity 5 at the two ends of its permanent magnet 3.In addition, at the inlet part of the high-coercivity permanent magnet 4 of rotor core 2, form second cavity 6 at the two ends of its permanent magnet 4.The magnetic pole piece of 7 expression rotor cores 2.Rotor core 2 constitutes through the lamination silicon steel plate.Low coercive force permanent magnet 3 is alnico magnet or FeCrCo magnet, and in addition, high-coercivity magnet 4 is NdFeB magnet.

As shown in Figure 1, stator 23 constitutes the interior toothed portion of stator winding 21 packages in stator core 24.Through rotor 1 being housed in the inside of the stator core 24 of this stator 23, constitute the permanent magnet rotary electric machine 20 of this execution mode.The inner peripheral surface of stator core 24 is relative with the outer peripheral face of rotor 1 across air gap 22.

Fig. 3 is expression as the alnico magnet (AlNiCo) of the low coercive force permanent magnet that is adopted at the rotor 1 of this execution mode, as the FeCrCo magnet of low coercive force permanent magnet with as the figure of the magnetic characteristic of the NdFeB magnet of high-coercivity permanent magnet.The coercive force of alnico magnet (magnetic flux density is 0 magnetic field) is 60～120kA/m, is 1/15～1/8 with respect to the coercive force 950kA/m of NdFeB magnet.In addition, the coercive force of FeCrCo magnet is about 60kA/m, is 1/15 with respect to the coercive force 950kA/m of NdFeB magnet.Alnico magnet and FeCrCo magnet are compared with the high-coercivity magnet of NdFeB, can know that coercive force is quite low.In this execution mode, use the high-coercivity permanent magnet 4 of 8～15 times coercive force with low coercive force permanent magnet 3, in view of the above, can access the electric rotating machine of excellent.

Low coercive force permanent magnet 3 is embedded in the rotor core 2, and first cavity 5 is set at the both ends of low coercive force permanent magnet 3.The radial direction configuration of the rotor that low coercive force permanent magnet 3 edges are consistent with the q axle that becomes the central shaft between magnetic pole is being magnetized with respect to the rectangular direction of radial direction.High-coercivity permanent magnet 4 is embedded in the rotor core 2, and second cavity 6 is set at the both ends of high-coercivity permanent magnet 4.High-coercivity permanent magnet 4 is configured in the roughly Zhou Fangxiang of rotor 1 with the mode by all side clampings in rotor 1 of two low coercive force permanent magnets 3.High-coercivity permanent magnet 4 is being magnetized with respect to the roughly rectangular direction of the Zhou Fangxiang of rotor 1.

The magnetic pole piece 7 of rotor core 2 forms by two low coercive force permanent magnets 3 and a high-coercivity permanent magnet 4 and surrounds.As shown in Figure 4, the central axis direction of the magnetic pole piece 7 of rotor core 2 becomes the d axle, and the central axis direction between magnetic pole becomes the q axle.Therefore, low coercive force permanent magnet 3 is configured in the q direction of principal axis of the central shaft that becomes between magnetic pole, and the direction of magnetization of low coercive force permanent magnet 3 is for to be 90 ° of perhaps-90 ° directions with respect to the q axle.In adjacent low coercive force permanent magnet 3, opposed facing magnetic pole strength becomes homopolarity.In addition, high-coercivity permanent magnet 4 is configured in respect to become the rectangular direction of d axle of the central shaft of magnetic pole piece 7, and its direction of magnetization is for being 0 ° of perhaps direction of 180 ° with respect to the d axle.In adjacent high-coercivity permanent magnet 4, magnetic pole piece 7 towards mutual antipolarity.

In the rotor 1 of this execution mode, the FeCrCo magnet that in low coercive force permanent magnet 3, is adopted or the coercive force of alnico magnet are little of 60～120kA/m, and the permanent magnet of these low coercive forces can be through the magnetizes of 200～300kA/m.Coercive force as the NdFeB magnet of high-coercivity permanent magnet 4 is high to 950kA/m, can be through the magnetizes of about 2400kA/m.That is, low coercive force permanent magnet 3 can attach magnetic through about 1/10 magnetic field of high-coercivity permanent magnet 4.In the permanent magnet rotary electric machine 20 that the rotor 1 that adopts this execution mode is assembled; Making conduction time is that the pulse current of utmost point short time (about 100 μ s～1ms) flows on fixing winding; Form magnetic field, make the action of a magnetic field in low coercive force permanent magnet 3.To attach magnetic magnetic field be 250kA/m if make, and then it is desirable to sufficient attach the magnetic the action of a magnetic field in low coercive force permanent magnet 3, on high-coercivity permanent magnet 4, less than because of attaching the irreversible demagnetization that magnetic produces.

Fig. 4 is the magnetic flux B31 that makes the

permanent magnet

3,4 that attaches the A-stage of magnetic magnetic field before playing a role that produces because of the d shaft current of this execution mode of expression, the figure of B41, and Fig. 5 is the expression magnetic flux B32 that makes the

permanent magnet

3,4 when attaching magnetic magnetic field and playing a role, the figure of B42.In addition, though the magnetic flux distribution in Fig. 4, Fig. 5 has only been expressed a utmost point, this magnetic flux distribution is identical in extremely four.The pulse current that formation attaches magnetic magnetic field is the d shaft current composition of the armature winding of stator.In Fig. 5; It is the situation that low coercive force permanent magnet 3 is carried out demagnetization; The magnetic field that produces because of negative d shaft current is degaussing field as far as permanent magnet; With respect to low coercive force permanent magnet 3 and high-coercivity permanent magnet 4, act on the direction roughly opposite from the pole center of rotor 1 with the direction of magnetization.In the permanent magnet rotary electric machine 20 of the rotor that has adopted this execution mode 1; The magnetic field B d that produces because of the d shaft current acts on two permanent magnets (two permanent magnets of the N utmost point and the S utmost point) in high-coercivity permanent magnet 4, the magnetic field that acts on high-coercivity permanent magnet 4 is magnetic field only about half of that acts on low coercive force permanent magnet 3.Therefore, in the permanent magnet rotary electric machine of the rotor that has adopted this execution mode 1, the magnetic field B d that produces because of the d shaft current will hang down 3 magnetization of coercive force permanent magnet easily.

Fig. 6 be this execution mode of expression rotor 1 attach the magnetic flux B33 behind the magnetic, the figure of B43.Low coercive force permanent magnet 3 coercive forces are about 1/10 of high-coercivity permanent magnet 4, have again, as stated, the twice of high-coercivity permanent magnet 4 attach the magnetic the action of a magnetic field on low coercive force permanent magnet 3.In Fig. 6, low coercive force permanent magnet 3 is magnetized in the direction of attaching magnetic magnetic field, is magnetized in the opposite direction of the direction of magnetization with initial stage of Fig. 4.Like this, can change the intensity of attaching magnetic magnetic field, adjust the magnetized state of low coercive force permanent magnet 3 through changing the size of d shaft current.That is, can generate the magnetic force that reduces low coercive force permanent magnet 3 state, to make the magnetic flux of low coercive force permanent magnet 3 be 0 state, the magnetic flux that makes low coercive force permanent magnet 3 is to these three states of reciprocal state.On the other hand, high-coercivity permanent magnet 4 coercive forces are greatly to low more than 10 times of coercive force permanent magnet 3, and in addition, in this execution mode, the magnetic magnetic field that attaches that acts on high-coercivity permanent magnet 4 is 1/2 of low coercive force permanent magnet 3.Therefore, if low coercive force permanent magnet 3 is attached the magnetic field of the degree of magnetic, then high-coercivity permanent magnet 4 is reversible erasing state, even after attaching magnetic, high-coercivity permanent magnet 4 also can be kept the magnetic flux of A-stage.

Formation through above-mentioned that kind; In the permanent magnet rotary electric machine 20 of the rotor that has adopted this execution mode 1; D shaft current through rotor 1; The flux of interlinkage of low coercive force permanent magnet 3 is changed from being up to 0 greatly, and in addition, can also make the direction of magnetization is positive and negative two directions.That is,, then can be on a large scale the interlinkage flux that hangs down coercive force permanent magnet 3 be adjusted to 0 even to reciprocal maximum from the maximum of positive direction if to make the interlinkage flux of high-coercivity permanent magnet 4 be positive direction.Therefore, in the rotor 1 of this execution mode, through by the d shaft current low coercive force permanent magnet 3 being attached magnetic, can adjust whole flux of interlinkages that will hang down coercive force

permanent magnet

3 and 4 additions of high-coercivity permanent magnet on a large scale.

For example; At low-speed region, low coercive force permanent magnet 3 is by the magnetization of d shaft current, so that reach maximum in the direction (A-stage) identical with the interlinkage flux of high-coercivity permanent magnet 4; In view of the above; The moment of torsion that produces because of permanent magnet reaches maximum, therefore, can make the moment of torsion of electric rotating machine and be output as maximum.

In addition, as shown in Figure 6 in the high speed zone, the magnetic flux of low coercive force permanent magnet 3 is reduced; Reduce whole flux of interlinkages, in view of the above, because the voltage of electric rotating machine descends; So, can produce more than neededly with respect to the higher limit of supply voltage, can further improve rotary speed (frequency).

Have again; When significantly improving maximum speed, (further enlarge the variable-ratio scope; For example; When the variable-ratio scope more than five times of substrate velocity), low coercive force permanent magnet 3 magnetizes (magnetic flux be oriented magnetization maximum under the state of Fig. 6) to become with the rightabout mode of the interlinkage flux of high-coercivity permanent magnet 4.Whole interlinkage fluxs of permanent magnet are interlinkage flux poor of high-coercivity permanent magnet 4 and low coercive force permanent magnet 3, can be minimum, and the voltage of electric rotating machine also becomes minimum, therefore, can rotary speed (frequency) be brought up to peak.

According to the rotor 1 of this execution mode,, can be implemented in high output large-scale variable-speed operation from low speed to high speed through it being used for electric rotating machine shown in Figure 1 20; In addition; Because the magnetoelectricity stream that attaches when interlinkage flux is changed only flows the utmost point short time, so, loss can obviously be reduced; Therefore, can become high efficiency.

When above-mentioned electric rotating machine 20 produces output, flow on stator winding 21 through making the q shaft current, utilize the magnetic action generation moment of torsion of magnetic flux of the

permanent magnet

3,4 of this q shaft current and rotor 1.At this moment, produce the magnetic field that produces because of the q shaft current.But; Because low coercive force permanent magnet 3 is configured in the q direction of principal axis, the direction of magnetization be and the rectangular direction of q direction of principal axis, hangs down the direction of magnetization of coercive force permanent magnet 3 and the magnetic field that produces because of the q shaft current is in the direction of quadrature; The influence in the magnetic field that therefore, produces because of the q shaft current is small.

Then, the effect in 5 and second cavity 6, first cavity is set forth.The centrifugal action that produces because of permanent magnet is relaxed stress the concentrating and degaussing field to rotor core 2 in 2 last times of rotor core in cavity 5,6.Through resembling

cavity

5,6 is set Fig. 2, unshakable in one's determination 2 can make the shape that has curvature, and stress obtains relaxing.In addition; The magnetic field concentration that existence produces because of electric current is in the bight of

permanent magnet

3,4, and degaussing field plays a role, and the bight is the situation of demagnetization irreversibly; In the rotor 1 of this execution mode; Because

cavity

5,6 is set in the magnet end, so the degaussing field that produces because of electric current in the permanent magnet end obtains relaxing.

Following effect, the effect of rotor 1 performance of this execution mode of the formation of above-mentioned that kind.If make the interlinkage flux of high-coercivity permanent magnet 4 is positive direction; The interlinkage flux that then can will hang down coercive force permanent magnet 3 on a large scale adjusts to 0 even reciprocal maximum from the maximum of positive direction; Therefore; Through by the d shaft current, make low coercive force permanent magnet 3 attach magnetic, can adjust whole flux of interlinkages that will hang down coercive force

permanent magnet

3 and 4 additions of high-coercivity permanent magnet on a large scale.Through adjusting whole flux of interlinkages of this permanent magnet on a large scale; Can also adjust the voltage of the electric rotating machine 20 that adopts this rotor 1 on a large scale; Because the pulsed electric current that attaches magnetic and be through the utmost point short time carries out, therefore, there is no need always to continue to flow weak flux current; So, can significantly reduce loss.In addition, because carry out weak flux regulator there is no need to resemble in the past, so the iron loss that produces because of the higher harmonics magnetic flux can not take place yet.Because above-mentioned situation, according to the rotor 1 of this execution mode, the electric rotating machine 20 that has adopted it is become can seek high efficiency with the electric rotating machine of height output large-scale variable-speed operation from low speed to high speed.

In addition; For the induced voltage that produces because of permanent magnet; Because low coercive force permanent magnet 3 is attached magnetic through the d shaft current, can dwindle whole flux of interlinkages of permanent magnet, so; There is not the breakage of the inverter electronic component that the induced voltage because of permanent magnet produces, seeks reliability and improve.Have again, when electric rotating machine 20 zero load rotations, through the d shaft current; Low coercive force permanent magnet 3 attached magnetic; Can dwindle whole flux of interlinkages of permanent magnet, in view of the above, induced voltage obviously reduces; Basically there is no need always to switch on is used to reduce the weak flux current of induced voltage, seeks the raising of overall efficiency.In addition, in this execution mode, the situation of the ends of the earth being described, even but be replaced into other number of poles, also can use equally.In addition, the structure of stator 23 is not limited to execution mode, and the stator that can adopt general electric rotating machine to use widely for example, except that illustrated distributed winding type, can also adopt the stator of concentrating coiled pipe type.This also is same in other execution mode.

The electric rotating machine 20 of (second execution mode) second execution mode of the present invention is characterised in that; When the high rotation speed of rotor 1, make back voltage that the high-coercivity permanent magnet 4 of this rotor produces below proof voltage as the inverter electronic component of the power supply of electric rotating machine.

The back voltage and the rotary speed that produce because of permanent magnet raise pro rata, and this back voltage puts on the electronic component of inverter, if reach more than the proof voltage of electronic component, and electronic component insulation breakdown then.Therefore, in permanent magnet rotary electric machine in the past, in when design, limit through proof voltage, the magnetic flux of permanent magnet is cut down, in the output and the inefficiency of the low-speed region of motor.

In above-mentioned electric rotating machine 20; Because if when high speed rotating; Then can be through negative d shaft current, what make the demagnetization direction attaches the magnetic the action of a magnetic field in permanent magnet, makes the magnetic flux of low coercive force permanent magnet 3 little near 0; So, can make the back voltage that produces because of low coercive force permanent magnet 3 be roughly 0.Like this, if make the back voltage that produces because of the high-coercivity permanent magnet 4 that can not adjust magnetic flux when high rotation speed below proof voltage.That is, only the magnetic flux of high-coercivity permanent magnet 4 is reached below the proof voltage for a short time.On the other hand, when low speed rotation, can be compared and significantly to increase with permanent magnet rotary electric machine in the past with the flux of interlinkage that high-coercivity permanent magnet 4 produces to the low coercive force permanent magnet 3 of maximum magnetic flux because of attaching magnetic.

Because above-mentioned situation, in the permanent magnet rotary electric machine 20 of this execution mode, height output and high efficiency in the time of can simultaneously maintaining low speed rotation, the back voltage when one side suppresses high speed rotating can improve the reliability of the system that comprises inverter.

The permanent magnet rotary electric machine 20 of (the 3rd execution mode) the 3rd execution mode of the present invention is characterised in that; The magnetic flux of the permanent magnet when it produces peak torque is under the state of maximum, and the magnetic flux that produces because of high-coercivity permanent magnet 4 lacks than the maximum flux that hangs down coercive force permanent magnet 3.

Through when electric rotating machine produces peak torque, making the low coercive force permanent magnet 3 of this rotor 1 and the magnetic flux of high-coercivity permanent magnet 4 is under the state of maximum, and necessary electric current reduces, and reaches high efficiency.Because when the highest rotation, can through the d shaft current attach magnetic magnetic field, make the magnetic flux of low coercive force permanent magnet 3 little near 0, so, can make because of hanging down the back voltage that coercive force permanent magnet 3 produces and be roughly 0.Like this, if make the back voltage that produces because of the high-coercivity permanent magnet 4 that can not adjust magnetic flux when high rotation speed below the proof voltage of the electronic component of inverter.In this execution mode; Because make the magnetic flux of the magnetic flux of high-coercivity permanent magnet 4 less than low coercive force permanent magnet 3; So the back voltage under each rotary speed that produces because of high-coercivity permanent magnet 4 is little, and then can rotate to high rotary speed.

(the 4th execution mode) the 4th execution mode of the present invention is in such permanent magnet rotary electric machine 20 that constitutes shown in Figure 1; It is characterized in that; At its voltage near the maximum voltage of supply power or when surpassing the high speed rotating of maximum voltage; For the interlinkage flux that produces because of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4 is reduced; Use the formed magnetic field of electric current of stator winding, make low coercive force permanent magnet 3 magnetization, whole flux of interlinkages of adjustment permanent magnet.The employed low coercive force permanent magnet 3 of this execution mode uses FeCrCo magnet or alnico magnet, and high-coercivity permanent magnet 4 uses NdFeB magnet.

In permanent magnet rotary electric machine, because the magnetic flux of permanent magnet is certain, so the voltage that produces because of the interlinkage flux of permanent magnet and the rotary speed of rotor 1 raise pro rata.Therefore, there is the upper limit in supply voltage, under the situation that electric rotating machine turns round from low speed to high speed on a large scale, if supply voltage reaches higher limit, then can not turn round with the rotary speed more than it.Therefore, because the voltage of electric rotating machine decides its size by winding induction coefficient and the interlinkage flux that produces because of permanent magnet, so the flux of interlinkage that reduces permanent magnet is considered in the rising of the voltage when suppressing high speed rotating.

As FeCrCo magnet, the alnico magnet of the low coercive force permanent magnet 3 that in this execution mode, uses, coercive force is little of 60～200kA/m, can be through the magnetizes of 200～300kA/m.As the NdFeB magnet of high-coercivity permanent magnet 4, coercive force is high to 950kA/m, can be through the magnetizes of 2400kA/m.Therefore, low coercive force permanent magnet 3 can attach magnetic through about 1/10 magnetic field of high-coercivity permanent magnet 4.In this execution mode, be the pulse current of utmost point short time (about 100 μ s～1ms) in stator winding 21 conduction times of flowing, form magnetic field, make the action of a magnetic field in low coercive force permanent magnet 3.To attach magnetic magnetic field be 250kA/m if make, and then it is desirable to sufficient the action of a magnetic field in low coercive force permanent magnet 3, on high-coercivity permanent magnet 4, less than because of attaching the irreversible demagnetization that magnetic produces.

State in the early stage, the interlinkage flux of low coercive force permanent magnet 3 and the interlinkage flux of high-coercivity permanent magnet 4 are in the state of increase in equidirectional addition.Like this; Reach at the voltage of electric rotating machine supply power maximum voltage near, when perhaps surpassing the high speed rotating of maximum voltage, negative d shaft current pulsed flows; As shown in Figure 5, apply and the reciprocal magnetic field of the direction of magnetization of low coercive force permanent magnet 3.Low coercive force permanent magnet 3 demagnetizations, perhaps as shown in Figure 6, be magnetized in the other direction.In view of the above, the interlinkage flux as the summation of hanging down coercive force permanent magnet 3 and high-coercivity permanent magnet 4 is reduced.Because flux of interlinkage reduces,, before reaching the higher limit of supply voltage, can further turn round with high speed rotating so the power of voltage ratio upper voltage limit of electric rotating machine is low.

Then, can change the intensity of attaching magnetic magnetic field, the magnetized state of low coercive force permanent magnet 3 changed, adjustment voltage through changing the size of d shaft current.At this moment, the magnetic flux of permanent magnet that low coercive force permanent magnet 3 can become state that magnetic force is reduced, the magnetic flux that makes the permanent magnet of low coercive force is 0 state, make low coercive force is at these three states of reciprocal state.

On the other hand, more than 3 big ten times, in addition, in this execution mode, the magnetic magnetic field that attaches that acts on high-coercivity permanent magnet 4 is 1/2 of low coercive force permanent magnet 3 to high-coercivity permanent magnet 4 coercive forces than low coercive force permanent magnet.Therefore, if low coercive force permanent magnet 3 is attached the magnetic field of magnetic degree, then high-coercivity permanent magnet 4 is reversible erasing states, even after attaching magnetic, the permanent magnet of high-coercivity also can be kept the magnetic flux of A-stage.

When producing output, flow on stator winding through making the q shaft current, utilize the magnetic action of the magnetic flux of q shaft current and permanent magnet to produce moment of torsion.At this moment, produce the magnetic field that produces because of the q shaft current.But because low coercive force permanent magnet 3 is configured in the q direction of principal axis, the direction of magnetization be and the rectangular direction of q direction of principal axis, so, the direction of magnetization and the direction that the magnetic field that produces because of the q shaft current is in quadrature of hanging down the permanent magnet of coercive force.The influence in the magnetic field that therefore, produces because of the q shaft current is small.

(the 5th execution mode) the 5th execution mode of the present invention is in such permanent magnet rotary electric machine that constitutes shown in Figure 1; It is characterized in that; When the low speed rotation below the maximum voltage of its voltage at supply power, increase in order to make the interlinkage flux that produces because of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4, through the formed magnetic field of the electric current of stator winding; Make low coercive force permanent magnet 3 magnetization; When perhaps surpassing its high speed rotating near the maximum voltage of voltage at supply power of electric rotating machine, reduce in order to make the interlinkage flux that produces because of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4, through the formed magnetic field of the electric current of stator winding; Make low coercive force permanent magnet 3 magnetization, the flux of interlinkage of adjustment permanent magnet.

Employed low coercive force permanent magnet 3 uses FeCrCo magnet or alnico magnet in this execution mode, and high-coercivity permanent magnet 4 uses NdFeB magnet.As FeCrCo magnet, the alnico magnet of the low coercive force permanent magnet 3 that in this execution mode, uses, coercive force is little of 60～200kA/m, can be through the magnetizes of 200～300kA/m.As the NdFeB magnet of high-coercivity permanent magnet 4, coercive force is high to 950kA/m, can be through the magnetizes of 2400kA/m.Therefore, low coercive force permanent magnet 3 can attach magnetic through 1/10 magnetic field of high-coercivity permanent magnet 4.In this execution mode, be the pulse current of utmost point short time (about 100 μ s～1ms) in the conduction time of flowing on the stator winding, form magnetic field, make the action of a magnetic field in low coercive force permanent magnet 3.To attach magnetic magnetic field be 250kA/m if make, and then it is desirable to sufficient the action of a magnetic field in low coercive force permanent magnet 3, on high-coercivity permanent magnet 4, less than because of attaching the irreversible demagnetization that magnetic produces.

When low speed rotation etc., with respect to the maximum of supply voltage, the voltage of electric rotating machine exists under the situation more than needed, and the magnetic magnetic field that attaches that produces because of positive d shaft current is produced, and makes low coercive force permanent magnet 3 magnetization.Low coercive force permanent magnet 3 is equidirectional with the interlinkage flux of high-coercivity permanent magnet 4, through addition, is in the magnetized state of direction of increase.Because interlinkage flux through permanent magnet and q shaft current generation moment of torsion, so the increase of interlinkage flux that can be through permanent magnet increases moment of torsion.

Near the voltage of electric rotating machine reaches the maximum voltage of power supply or when surpassing its high speed rotating; Same with the 4th execution mode; For the interlinkage flux that produces because of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4 is reduced; Through the formed magnetic field of the electric current of stator winding, make low coercive force permanent magnet 3 magnetization, the flux of interlinkage of adjustment permanent magnet.Because flux of interlinkage reduces, so the power of voltage ratio voltage max of electric rotating machine is low, before reaching the maximum of supply voltage, further high speed rotating ground turns round.

Because above-mentioned situation, with the d shaft current as attaching magnetoelectricity stream magnetic field, through the d shaft current; The flux of interlinkage of the low coercive force permanent magnet 3 of adjustment; In view of the above, when low speed, produce high moment of torsion, obtain and to drive with height output carrying out high speed rotating; Can export the electric rotating machine that carries out variable-speed operation on a large scale from low speed to high speed with height.

(the 6th execution mode) the 6th execution mode of the present invention is in such permanent magnet rotary electric machine 20 that constitutes shown in Figure 1; It is characterized in that; The magnetic field that d shaft current through stator winding 21 is generated; Adjust the magnetic flux of low coercive force permanent magnet 3, making because of hanging down coercive force permanent magnet 3 is 0 with the flux of interlinkage that high-coercivity permanent magnet 4 produces.

Employed low coercive force permanent magnet 3 uses FeCrCo magnet or alnico magnet in this execution mode, and high-coercivity permanent magnet 4 uses NdFeB magnet.As FeCrCo magnet, the alnico magnet of the low coercive force permanent magnet 3 that in this execution mode, uses, coercive force is little of 60～200kA/m, can be through the magnetizes of 200～300kA/m.As the NdFeB magnet of high-coercivity permanent magnet 4, coercive force is high to 950kA/m, can be through the magnetizes of 2400kA/m.Therefore, low coercive force permanent magnet 3 can attach magnetic through about 1/10 magnetic field of high-coercivity permanent magnet 4.

In this execution mode, be the pulse current of utmost point short time (about 100 μ s～1ms) in the conduction time of flowing on the stator winding, form magnetic field, make the action of a magnetic field in low coercive force permanent magnet 3.To attach magnetic magnetic field be 250kA/m if make; Attach magnetic though then it is desirable to sufficient the action of a magnetic field in low coercive force permanent magnet 3, high-coercivity permanent magnet 4 is not magnetized, if pulse current reaches 0; Then carry out reversible variation, turn back to original state.That is, the flux of interlinkage of low coercive force permanent magnet 3 is adjusted, and the flux of interlinkage of high-coercivity permanent magnet 4 is certain.

Like this, attach magnetic magnetic field through what produce because of the d shaft current, adjust the magnetic flux of low coercive force permanent magnet 3, making the flux of interlinkage that produces because of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4 is 0.Because the interlinkage flux that produces because of permanent magnet is 0, so, under the situation of outer buttons rotating motor, can not produce the iron loss that interlinkage flux caused because of permanent magnet in company with rotation.Have, be applied under the situation of hybrid vehicle, Electric drive system at permanent magnet motor that will be in the past, when high speed rotating, the induced voltage that produces because of permanent magnet reaches more than the proof voltage of electronic component of inverter, makes electronic component damaged.In addition, in order the voltage of motor to be guaranteed below supply voltage even zero load, also need always make weak flux current continue to flow in the high speed rotating zone, the overall efficiency of motor worsens.

Be applied at permanent magnet rotary electric machine under the situation of hybrid vehicle, Electric drive system this execution mode; Because can the interlinkage flux that produce because of permanent magnet be adjusted to 0; So; There is not the damaged situation of electronic component that makes inverter because of the induced voltage of permanent magnet,, there is no need zero load ground and always make weak flux current continue to flow in the high speed rotating zone.Therefore,, then can improve the reliability of application system, simultaneously, also can obtain high efficiency if use the electric rotating machine of this execution mode.

(the 7th execution mode) the 7th execution mode of the present invention is in such permanent magnet rotary electric machine 20 that constitutes shown in Figure 1; It is characterized in that the magnetic flux that the above-mentioned low coercive force permanent magnet 3 when attaching magnetic and obtain maximum magnetic flux through the d shaft current is generated is identical with the magnetic flux that high-coercivity permanent magnet 4 is generated.

The low coercive force permanent magnet 3 of employed rotor 1 uses FeCrCo magnet or alnico magnet in this execution mode, and high-coercivity permanent magnet 4 uses NdFeB magnet.

As FeCrCo magnet, the alnico magnet of the low coercive force permanent magnet 3 that in this execution mode, uses, coercive force is little of 60～200kA/m, can be through the magnetizes of 200～300kA/m.As the NdFeB magnet of high-coercivity permanent magnet 4, coercive force is high to 950kA/m, can be through the magnetizes of 2400kA/m.Therefore, low coercive force permanent magnet 3 can attach magnetic through 1/10 magnetic field of high-coercivity permanent magnet 4.

Like this, set forth,, then can improve the reliability of the application system of electric rotating machine, simultaneously, also have to obtain high efficiency big effect if can make the flux of interlinkage of permanent magnet is 0 as the 6th execution mode.In view of the above, attached magnetic magnetic field through what produce because of the d shaft current, adjust the magnetic flux of low coercive force permanent magnet 3, making the flux of interlinkage that produces because of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4 is 0.

In the 7th execution mode, the magnetic flux that the permanent magnet 3 of coercive force is generated is identical with the magnetic flux that high-coercivity permanent magnet 4 is generated.Therefore; The direction of magnetization of low coercive force permanent magnet 3 as produce in the direction opposite with the interlinkage flux of high-coercivity permanent magnet 4 interlinkage flux towards; As long as the magnetic magnetic field that attaches more than the 250kA/m is applied on the low coercive force permanent magnet 3, attaches magnetic fully and get final product.That is, only attach magnetic magnetic field through becoming more than the 250kA/m, just can not attached the influence of the environmental condition of the change of magnetoelectricity stream, the temperature when attaching magnetic etc., the whole flux of interlinkages that make permanent magnet conscientiously and easily are 0.

(the 8th execution mode) Fig. 7 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 8th execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2.The formation of rotor 1 shown in Figure 7 is in the inside of rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing respectively.In rotor core 2, except that the part of the end side of low coercive force permanent magnet 3, make near the end of low coercive force permanent magnet 3 air gap side core portion from the most peripheral depression of rotor core 2, in view of the above, form depressed part 8.Two ends at the inlet part of the low coercive force permanent magnet 3 of rotor core 2 form first cavity 5, form second cavity 6 at the two ends of the inlet part of high-coercivity permanent magnet 4.The 7th, the magnetic pole piece of rotor core 2.

The effect of the rotor 1 of this execution mode then, is described.The permanent magnet rotary electric machine 20 that adopts this rotor 1 is formations identical with Fig. 1.In such electric rotating machine 20, the low coercive force permanent magnet 3 and the high-coercivity permanent magnet 4 of the magnetic flux of the axial electric current of d (d axle magnetic flux) crosscut rotor 1.Therefore, because the magnetic susceptibility of permanent magnet and air about equally, so d axle induction coefficient reduces.On the other hand, the axial magnetic flux of q is mobile along the length direction of low coercive force permanent magnet 3 and high-coercivity permanent magnet 4 at the magnetic pole piece 7 of rotor core 2.Because the magnetic susceptibility of the magnetic pole piece 7 of rotor core 2 is 1000～10000 times of permanent magnet, so if in the axial rotor core 2 of q, do not cave in, the external diameter of rotor core 2 is even at Zhou Fangxiang, then q axle induction coefficient increases.Like this, though for the magnetic action through electric current and magnetic flux produces moment of torsion, the q shaft current is flowed,, because q axle induction coefficient is big, so the voltage that is produced by the q shaft current increases.That is, because q axle induction coefficient increases, power factor worsens.

In this execution mode, the core portion through near air gap 22 sides the end of low coercive force permanent magnet 3 forms from the depressed part 8 of the most peripheral depression of rotor core 2, reduces the magnetic flux through unshakable in one's determination 2 depressed part 8.That is, because depressed part 8 is in the q direction of principal axis, so, can reduce q axle induction coefficient.In view of the above, can improve power factor.In addition, because the depressed part 8 through rotor core 2, near the end of low coercive force permanent magnet 3, air gap is long to be increased equivalently, so near the average magnetic field the end of low coercive force permanent magnet 3 reduces.In view of the above, can reduce in order to produce of the influence of the needed degaussing field that produces because of the q shaft current of moment of torsion low coercive force permanent magnet 3.

In addition, owing to do not cave in the core portion of the maintenance permanent magnet that is in the end of hanging down coercive force permanent magnet 3, so; Can increase the footpath direction length of low coercive force permanent magnet 3 as much as possible; Therefore, in the identical rotor of external diameter, obtain the volume of permanent magnet the biglyyest.That is, the magnetic flux of permanent magnet can be increased, the output of each identical rotor volume can be increased.

(the 9th execution mode) Fig. 8 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 9th execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7.In Fig. 8, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing.Then, form first cavity 5, form second cavity 6 at the two ends of high-coercivity permanent magnet 4 at the two ends of low coercive force permanent magnet 3.The 7th, the magnetic pole piece of expression rotor core 2.

Low coercive force permanent magnet 3 is configured in and the consistent radial direction of q axle that becomes between adjacent magnetic pole piece 7, magnetic pole between 7 central shaft partly.Then; In the end of low coercive force permanent magnet 3 with between the central authorities of the magnetic pole piece 7 of rotor core 2; The central portion of the magnetic pole piece 7 of rotor core 2 becomes the most peripheral part of rotor 1; Along with the outer circumferential side core portion of end, will form depressed part 8 here from the axle center of rotor 1 to the reduced distances of the periphery of rotor core 2 from the central portion of magnetic pole piece 7 to low coercive force permanent magnet 3.

Then, set forth the effect of the rotor 1 of above-mentioned formation.The permanent magnet rotary electric machine 20 that adopts this rotor 1 is and identical formation shown in Figure 1.Like this, in this electric rotating machine 20, the low coercive force permanent magnet 3 and the high-coercivity permanent magnet 4 of the magnetic flux of the axial electric current of d (d axle magnetic flux) crosscut rotor 1 are because the magnetic susceptibility of permanent magnet and air about equally, so d axle induction coefficient reduces.On the other hand, the axial magnetic flux of q flows on low coercive force permanent magnet 3 and high-coercivity permanent magnet 4 at the magnetic pole piece 7 of rotor core along its length.

Because the core part of magnetic pole 7 magnetic susceptibilities are 1000～10000 times of magnet, so if partly do not have depressed part 8 in the axial rotor core of q, the rotor core external diameter is even at Zhou Fangxiang, then q axle induction coefficient increases.Like this, though for the magnetic action through electric current and magnetic flux produces moment of torsion, the q shaft current is flowed,, because q axle induction coefficient is big, so the voltage that is produced by the q shaft current increases.Its result is that if partly do not have depressed part 8 in the axial rotor core of q, the rotor core external diameter is even at Zhou Fangxiang, then induction coefficient increase, power factor deterioration.

But, in this execution mode, be along with outer circumferential side core portion from the central portion of the periphery of magnetic pole piece 7 to the end of low coercive force permanent magnet 3, will be from the axle center of rotor 1 to the shape of the reduced distances of the periphery of rotor core 2.In view of the above, adopted air gap side iron core in the permanent magnet rotary electric machine of this rotor 1 to become along with the end from the central authorities of magnetic pole piece 7 to low coercive force permanent magnet 3, the shape that the depression of depressed part 8 is deepened.Because depressed part 8 with such shape, air gap is long to be increased, so it is dark more to cave in, the magnetic flux through this depressed part 8 reduces.That is, because depressed part 8 is in the q direction of principal axis, so, can reduce q axle induction coefficient.In view of the above, because can reduce q axle induction coefficient, so, can improve power factor.Particularly, because near the core part the end of the low coercive force permanent magnet 3 on being in the q axle, it is the darkest to cave in, so, can reduce q axle induction coefficient effectively.

In addition, because depressed part 8, in the end of low coercive force permanent magnet 3, because the air gap of above-mentioned electric rotating machine 20 is long the longest, so near the magnetic field the end of low coercive force permanent magnet 3 reduces.The degaussing field that in view of the above, can reduce to produce because of the q shaft current that is used to produce moment of torsion is to the influence of low coercive force.

(the tenth execution mode) Fig. 9 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the tenth execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7, Fig. 8.In Fig. 9, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing.Then, form first cavity 5, form second cavity 6 at the two ends of high-coercivity permanent magnet 4 at the two ends of low coercive force permanent magnet 3.In addition, make the part of the periphery that is equivalent to low coercive force permanent magnet 3 of rotor core 2, also comprise its two side portions depression, form depressed part 8 here.The 7th, the magnetic pole piece of expression rotor core 2.α is the central angle of circular arc of central portion of the magnetic pole piece 7 of expression rotor core 2.

The central portion of the magnetic pole piece 7 of rotor core 2 forms the scope of the central angle alpha of the circular arc of magnetic pole central portion 90～140 degree at the electric degree angle by the circular arc of the maximum radius (length from the rotor center axle to the rotor periphery is maximum) of rotor 1.In rotor core 2, leaving the area part of this central angle alpha, become the periphery that makes rotor core 2 is compared inside all side depressions with the circular arc of the maximum radius of rotor 1 shape, will be here as depressed part 8.

Adopted the permanent magnet rotary electric machine 20 of this rotor 1 roughly the same with formation shown in Figure 1.So, in such electric rotating machine 20,, under the situation about driving below the maximum with supply voltage,, maximally utilise the magnetic flux of permanent magnet in order to obtain high efficiency in the low-medium speed zone.In this execution mode, form by the circular arc of the maximum radius of rotor 1 because represent the middle body of magnetic pole piece 7 of the rotor core 2 of scope with central angle alpha, so near the air gap the d axle of electric rotating machine is long minimum.Therefore, near the magnetic pole middle body the d of central angle alpha axle can make the flux of interlinkage of high-coercivity permanent magnet 4 and low coercive force permanent magnet 3 many.

Because near the rotor 1 having the q axle of low coercive force permanent magnet 3, be the periphery of rotor core 2 is compared inside all side depressions with the circular arc of the maximum radius of rotor 1 shape, so, a little less than the magnetic field that produces because of the q shaft current.Therefore, can when applying the q shaft current in order to produce moment of torsion, prevent the situation of low coercive force permanent magnet 3 owing to the magnetic field demagnetization that produces because of the q shaft current.

Through above-mentioned formation; In the permanent magnet rotary electric machine 20 of the rotor that has adopted this execution mode 1; Can be through increasing near the magnetic flux of the permanent magnet that the d axle, produces; Guarantee high output and high moment of torsion, simultaneously, can significantly relax the influence of the demagnetization of the low coercive force permanent magnet 3 that produces because of the q shaft current.

Figure 10 is the figure with respect to the variation of the moment of torsion of the pole center angle α of permanent magnet rotary electric machine that this execution mode has been used in expression.In the time of can knowing the scope of the central angle alpha of circular arc 90～140 degree of magnetic pole central portion, can access big moment of torsion at the electric degree angle.

(the 11 execution mode) explained the permanent magnet rotary electric machine of the 11 execution mode of the present invention.The permanent magnet rotary electric machine of this execution mode is in the permanent magnet rotary electric machine 20 of Fig. 1, first execution mode shown in Figure 2; It is characterized in that the direction of magnetization thickness of low coercive force permanent magnet 3 that makes the rotor core 2 of imbedding rotor 1 is than the direction of magnetization thin thickness of high-coercivity permanent magnet 4.The intensity and the direction of magnetization thickness in magnetic field that permanent magnet is attached magnetic is roughly proportional.Therefore, the direction of magnetization thickness through making low coercive force permanent magnet 3 can reduce the magnetic field that low coercive force permanent magnet 3 is attached magnetic than the direction of magnetization thin thickness of high-coercivity permanent magnet 4, can reduce and attach magnetoelectricity stream.

In addition, temperature characterisitic worsens general high-coercivity permanent magnet 4 along with reaching the high magnetic energy product, and under the high temperature condition more than 100 ℃, coercive force reduces, and through littler degaussing field, permanent magnet is demagnetization irreversibly.But, in this execution mode, because can reduce low coercive force permanent magnet 3 is attached the magnetic field of magnetic; So; Even at permanent magnet is under the condition of high temperature, make and attach magnetic magnetic field and play a role, also can prevent irreversibly demagnetization of high-coercivity permanent magnet 4.

(the 12 execution mode) Figure 11 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 12 execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9.In Figure 11, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing.Then, form first cavity 5, form second cavity 6 at the two ends of high-coercivity permanent magnet 4 at the two ends of low coercive force permanent magnet 3.In addition, make the part of the periphery that is equivalent to low coercive force permanent magnet 3 of rotor core 2, also comprise its two side portions depression, form depressed part 8 here.The 7th, the magnetic pole piece of expression rotor core 2.The rotor 1 of this execution mode is characterised in that the direction of magnetization variable thickness of low coercive force permanent magnet 3 is fixed, is the outer circumferential side along with convergence rotor 1, the shape that thickness increases gradually.

Attach the magnetic the action of a magnetic field under the situation of low coercive force permanent magnet 3 making, the magnetic magnetic field that attaches that acts on the low coercive force permanent magnet 3 in the rotor 1 is not equally to distribute, the intensity in magnetic field bias in permanent magnet.If a magnetic field deflection part, then be difficult to attach the adjustment of the magnetic flux of the low coercive force permanent magnet 3 that the magnetoelectricity flow carried out.In addition because the magnetic flux of permanent magnet also because of the change that attaches magnetic magnetic field and the state of temperature when driving change, so, the reproducibility that the magnetic flux when being difficult to obtain to attach magnetic is few in inconsistent scope.Therefore, this execution mode has been used the characteristic that the necessary magnetizing force of magnetic changes according to the direction of magnetization thickness of permanent magnet greatly of attaching of permanent magnet.

Therefore, the direction of magnetization variable thickness of the rotor 1 low coercive force permanent magnet 3 of this execution mode is fixed, has changed thickness.Therefore, make when attaching magnetic magnetic field and playing a role, can change the magnetic flux that the permanent magnet part at each thickness is produced, can make the intensity of attaching magnetic magnetic field depend on the influence that thickness caused of permanent magnet greatly.In view of the above; Can reduce the bias that concentrated grade caused because of magnetic field, the influence that is caused because of the external condition change of the change that attaches magnetic magnetic field etc.; Adjustment with respect to the magnetic flux that attaches magnetoelectricity stream is become easily, can reduce because of external condition and change the inconsistent of the magnetic flux that caused.

Figure 12 is the cutaway view of the length direction of the low coercive force permanent magnet 3 that in this execution mode, adopts.In Figure 12, making the direction of magnetization thickness of low coercive force permanent magnet 3 is the different thickness in stage shape ground.Through this shape, can likewise increase the amplitude of variation of the magnetic flux of permanent magnet in stage ground with the amplitude of variation of the thickness of permanent magnet.Therefore, compare, can make the amplitude of variation of thickness of permanent magnet very big the influence of magnetic flux with the amplitude of fluctuation of attaching magnetic magnetic field that produces because of interference, environmental condition.Promptly; Make low coercive force permanent magnet 3 magnetization; Make under the situation of magnetic flux change, can reduce inconsistent because of the magnetic flux that change produced that attaches magnetic magnetic field, can access the also high structure of reproducibility of the magnetic flux of the same low coercive force permanent magnet 3 that attaches magnetoelectricity stream.

(the 13 execution mode) Figure 13 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 13 execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9, Figure 11.In Figure 13, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing.Then, form first cavity 5, form second cavity 6 at the two ends of high-coercivity permanent magnet 4 at the two ends of low coercive force permanent magnet 3.In addition, make the part of the periphery that is equivalent to low coercive force permanent magnet 3 of rotor core 2, also comprise its two side portions depression, form depressed part 8 here.The 7th, the magnetic pole piece of expression rotor core 2.

In this execution mode, it is characterized in that low coercive force permanent magnet 3 is the outer circumferential sides along with convergence rotor 1, the shape of the taper of direction of magnetization thickness attenuation.Like this; Through outer circumferential side along with convergence rotor 1; Make the thickness attenuation of low coercive force permanent magnet 3, the rotor core face that cause and low coercive force permanent magnet 3 join bears the centrifugal force that hangs down coercive force permanent magnet 3; In view of the above, rotor core 2 can keep low coercive force permanent magnet 3.In addition, even the dimensional accuracy of the direction of magnetization thickness of low coercive force permanent magnet 3 is coarse, with direction position, the corresponding footpath of size, also can fix permanent magnet through low coercive force permanent magnet 3 contact rotor cores 2.If use this execution mode simultaneously with autofrettage based on the permanent magnet of moulding, then can also use the bad permanent magnet of dimensional accuracy after the moulding of molded shortcoming, molded through low coercive force permanent magnet improved batch process property.

Have again, in the maintenance and production that improve low coercive force permanent magnet 3, can also obtain following effect and effect.Under the thickness of low coercive force permanent magnet 3 is certain situation; In low coercive force permanent magnet 3; Exist and produce the bias of attaching magnetic magnetic field; The situation that the magnetic flux bias of the part of the permanent magnet of only low coercive force changes and with respect to the precipitous problem of amplitude of variation of the magnetic flux of the permanent magnet of changes of magnetic field amplitude.Permanent magnet attach the thickness that magnetic magnetic field depends on permanent magnet greatly, when attaching magnetic, the magnetic flux of the permanent magnet of this part changes because of thickness greatly.In this execution mode, because the thickness of low coercive force permanent magnet 3 is different, so through attaching magnetic magnetic field accordingly with separately thickness, its part magnetic flux that conforms to changes greatly.That is, because the thickness of permanent magnet, the intensity in the magnetic field that the magnetic flux of permanent magnet changes greatly is different.In view of the above, can obtain the amplitude of variation of attaching magnetic magnetic field with respect to the amplitude of variation of the magnetic flux of low coercive force permanent magnet 3 widely.Promptly; In electric rotating machine; Can attach magnetoelectricity stream through adjustment; Come easily to adjust the magnetic flux of permanent magnet arbitrarily, the inconsistent minimizing of the magnetic flux of the permanent magnet of the low coercive force when attaching magnetic repeatedly (good reproducibility) can reduce the amplitude of fluctuation because of the magnetic flux of the permanent magnet that change produced when attaching magnetic of the ambient conditions of the change that attaches magnetoelectricity stream, temperature etc.

(the 14 execution mode) Figure 14 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 14 execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9, Figure 11, Figure 13.In Figure 14, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing.Then, medial extremity formation first cavity 5 at low coercive force permanent magnet 3 forms second cavity 6 at the two ends of high-coercivity permanent magnet 4.In addition, make the part of the periphery that is equivalent to low coercive force permanent magnet 3 of rotor core 2, also comprise its two side portions depression, form depressed part 8 here.The 7th, the magnetic pole piece of expression rotor core 2,9 expression magnetic cup barriers, 10 expression projections.

In the rotor 1 of this execution mode, near the rotor core 2 the air gap side end of low coercive force permanent magnet 3, setting is compared with the thickness of the direction of magnetization of low coercive force permanent magnet 3, at the long magnetic cup barrier 9 of the Zhou Fangxiang of rotor.Magnetic cup barrier 9 is holes, and air is arranged.In addition, in outer circumferential side (air gap side) end of low coercive force permanent magnet 3 projection 10 is set.Projection 10 is born the centrifugal force of low coercive force permanent magnet 3, keeps permanent magnet.

The rotor 1 and first execution mode of this execution mode are same, are to be assembled in the permanent magnet rotary electric machine shown in Figure 1 20 to use.With respect to such permanent magnet rotary electric machine 20, if the generation moment of torsion, and the q shaft current is flowed, then on the low coercive force permanent magnet 3 that is in the rotor 1 on the q axle, produce the magnetic field that is produced because of the q shaft current.In the rotor 1 of this execution mode; Because magnetic cup barrier 9 is set near the end of low coercive force permanent magnet 3; So, can be through the air layer of magnetic cup barrier 9, reduce to act on the magnetic field of q shaft current of the end of low coercive force permanent magnet 3; The demagnetization of the low coercive force permanent magnet 3 that in view of the above, can suppress to cause and increase magnetic because of the q shaft current.In addition; Because magnetic cup barrier 9 is compared with the direction of magnetization thickness of low coercive force permanent magnet 3; Long at Zhou Fangxiang; So, can relax the magnetic field that produces because of the q shaft current in the bight of the end that concentrates on low coercive force permanent magnet 3, can prevent because of the magnetic field of q shaft current around the demagnetization of the low coercive force permanent magnet of going into to cause 3 and increase magnetic.Have again,, be present in the Zhou Fangxiang of rotor longways, so the axial reluctance force of q raises, and can reduce the magnetic flux that produces because of the q shaft current because magnetic cup barrier 9 is the center with the q axle.Therefore, because q axle induction coefficient diminishes, so, can improve power factor.

(the 15 execution mode) Figure 15 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 15 execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9, Figure 11, Figure 13, Figure 14.In Figure 15, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 3, high-coercivity permanent magnet 4 to divide equally spacing.Then, medial extremity formation first cavity 5 at low coercive force permanent magnet 3 forms second cavity 6 at the two ends of high-coercivity permanent magnet 4.In addition, make the part of the periphery that is equivalent to low coercive force permanent magnet 3 of rotor core 2, also comprise its two side portions depression, form depressed part 8 here.In Figure 15, the 7th, the magnetic pole piece of rotor core 2, the 9th, magnetic cup barrier, the 10th, projection.In this execution mode, it is characterized in that the magnetic pole piece 7 of the rotor core 2 between adjacent low coercive force permanent magnet 3 is provided with slit 11 in the central shaft consistent location with the d axle.

Because this slit 11 is on the d axle, so, not on the magnetic cup barrier of d axle magnetic flux, but become the magnetic cup barrier of q axle magnetic flux.Therefore, to being that the influence of magnetic flux of permanent magnet of central distribution is very little with the d axle, simultaneously, can reduce the magnetic flux of q axle.Therefore, in the permanent magnet rotary electric machine 20 of the rotor that has adopted this execution mode 1, can simultaneously keep the moment of torsion that produces because of permanent magnet, one side improves power factor.

(the 16 execution mode) Figure 16 A, Figure 16 B are the rotor 1 of the 16 execution mode of the present invention and the cutaway view of permanent magnet rotary electric machine 20.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9, Figure 11, Figure 13～Figure 15.In Figure 16 A, the formation of rotor 1 is in rotor core 2, imbeds low coercive force permanent magnet 4A, high-coercivity permanent magnet 3A to divide equally spacing.Then, medial extremity formation first cavity 5 at high-coercivity permanent magnet 3A forms second cavity 6 at the two ends of low coercive force permanent magnet 4A.In addition, make the part of the periphery that is equivalent to high-coercivity permanent magnet 3A of rotor core 2, also comprise its two side portions depression, form depressed part 8 here.The 7th, the magnetic pole piece of expression rotor core 2.

Rotor 1 and first～the 15 execution mode of this execution mode is different, it is characterized in that, high-coercivity permanent magnet 3A is configured in the footpath direction of rotor 1, low coercive force permanent magnet 4A and Zhou Fangxiang is configured in abreast interior all sides of rotor core 2.

Shown in Figure 16 B, the rotor 1 of this execution mode is same with other execution mode, is housed in the central portion of the stator 23 of permanent magnet rotary electric machine 20, and the magnetic field rotation that is produced by stator coil 21 drives.When constituting this permanent magnet rotary electric machine 20, for the magnetic field that produces because of stator current that acts on the high-coercivity permanent magnet 3A that is configured in the footpath direction, make following magnetic circuit.That is high-coercivity permanent magnet 3A (the crosscut) → adjacent rotors magnetic pole 7 → stator core 24 of stator core 24 → air gap 22 → rotor magnetic pole 7 → be positioned at footpath direction.On the other hand, with regard to act on be configured in for the magnetic field that produces because of stator current of low coercive force permanent magnet 4A of Zhou Fangxiang of all sides, make following magnetic circuit.That is the circumferential portion of circumferential portion → adjacent rotors unshakable in one's determination 2 of low coercive force permanent magnet 4A (crosscut) → rotor core 2 of stator core 24 → air gap 22 → rotor magnetic pole 7 → be positioned at Zhou Fangxiang → be positioned at low coercive force permanent magnet 4A (crosscut) → adjacent rotors magnetic pole 7 → stator core 24 of adjacent Zhou Fangxiang.

Therefore, the action of a magnetic field that produces because of electric current acts on the high-coercivity permanent magnet 3A who is configured in the footpath direction on two low coercive force permanent magnet 4A that are configured in Zhou Fangxiang.In view of the above; If make high-coercivity permanent magnet 3A identical, then be configured in magnetic field that the electric current of the high-coercivity permanent magnet 3A of direction directly produces than the strong twice of low coercive force permanent magnet 4A that is disposed at Zhou Fangxiang because of acting on the thickness of low coercive force permanent magnet 4A.

Stator is being carried out water cooling, oil cooling but; Carry out through increase specific electric loading (ampere-turn of each unit perimeter) in the electric rotating machine of high outputization; Magnetic field through producing because of load current is big, and the strong magnetic field because of this load current produces has produced local demagnetization.Even under the situation of the electric rotating machine of so high output density; In the permanent magnet rotary electric machine 20 of this execution mode; Also be all sides in the low coercive force permanent magnet 4A of the influence through receiving magnetic field easily is configured in, dwindle the influence of local demagnetization.In view of the above; Permanent magnet rotary electric machine 20 according to this execution mode; Can magnetize permanent magnet through d shaft current with rotor 1; When making the flux of interlinkage of permanent flux variable, the characteristic variations of the permanent magnet that can also suppress to produce because of load current also can be kept high outputization.

In addition, in this execution mode, depressed part 8 unshakable in one's determination can form as required, also can be as first execution mode shown in Figure 2, and the outer peripheral face of rotor core 2 becomes the formation of positive circular section, in addition, also can be Fig. 7, shape shown in Figure 9.In addition, first cavity 5 also can be Figure 14, shape shown in Figure 15.Have again, with regard to the high-coercivity permanent magnet 3A of the permanent magnet that becomes outer circumferential side, can make the shape of Figure 12, Figure 13 or Figure 14.

(the 17 execution mode) Figure 17 is the cutaway view of rotor 1 of the permanent magnet rotary electric machine of the 17 execution mode of the present invention.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9, Figure 11, Figure 13～Figure 16.The rotor 1 of this execution mode is characterised in that, as the permanent magnet of the footpath direction of rotor core 2, and configuration high-coercivity permanent magnet 3B, the permanent magnet as the Zhou Fangxiang of interior all sides of rotor core 2 also disposes high-coercivity permanent magnet 4B.Other formation is identical with the 16 execution mode shown in Figure 16 A.In addition, use the rotor 1 of this execution mode, the situation that constitutes permanent magnet rotary electric machine 20 is also identical with Figure 16 B.

High-coercivity

permanent magnet

3B, 4B are for attaching magnetic magnetic field, the direction of magnetization thickness that magnetized state is changed through what produce because of the d shaft current.Perhaps, only be the high-coercivity permanent magnet 3B of footpath direction, or the high-coercivity permanent magnet 4B of Zhou Fangxiang is for attaching magnetic magnetic field through what produce because of the d shaft current, the direction of magnetization thickness that magnetized state is changed.

In the rotor 1 of this execution mode; Because on the permanent magnet 3B of the footpath of rotor core 2 direction; On the permanent magnet 4B of the Zhou Fangxiang of interior all sides of rotor core 2, all dispose the high-coercivity permanent magnet; So, can obtain stable properties with respect to the interference in magnetic field that produces because of load current etc.

Through water, oil stator is cooled off, electric rotating machine has increased specific electric loading (ampere-turn of each unit perimeter), can carry out height outputization.But, because the magnetic field that produces because of load current is big, so, because the strong magnetic field that produces because of load current has also produced local demagnetization on the permanent magnet around.Under the situation of the electric rotating machine of so high output density, through using the high-coercivity permanent magnet, the influence in the magnetic field that has reduced to produce because of load current can access stable permanent magnet characteristic.But, even permanent magnet is to attach magnetic magnetic field through what produce because of the d shaft current, also can abundant magnetized thickness.For example, direction permanent magnet 3B is thinner than Zhou Fangxiang permanent magnet 4B in the footpath, attaches magnetic magnetic field (few d shaft current) through littler, can adjust the amount of magnetization of permanent magnet.

(the 18 execution mode) uses Figure 18, and the permanent magnet rotary electric machine of the 18 execution mode of the present invention is described.In addition, use identical symbol to represent to the key element identical or equal with Fig. 2, Fig. 7～Fig. 9, Figure 11, Figure 13～Figure 17.

The characteristic of this execution mode only is, and is shown in figure 18, in rotor core 2, is provided with to prevent slit 12 this point used because of the degaussing field that permanent magnet produces.At the outer circumferential side of rotor core 2, the low coercive force permanent magnet 3 of direction configuration in the footpath is in interior all sides of rotor core 2, at Zhou Fangxiang configuration high-coercivity permanent magnet 4.Then, on the magnetic pole piece 7 of rotor core 2, be provided with and prevent that the slit 12 used because of the degaussing field that permanent magnet produces, this slit 12 from cutting off the magnetic flux because of hanging down magnetic flux that coercive force permanent magnet 3 produces and producing because of high-coercivity permanent magnet 4.

Because low coercive force permanent magnet 3 is configured in the pole core portion with high-coercivity permanent magnet 4 equally; So degaussing field interacts, still; In this execution mode; Because slit 12 is in each other, so, can make the influence of the degaussing field that produces because of other permanent magnet little to the degree that can not receive basically.Therefore, low coercive force permanent magnet 3 can be owing to the degaussing field that is produced because of high-coercivity permanent magnet 4 with because of degaussing field demagnetization that load current produced when load.In addition, because of the increase and decrease of the magnetic flux that attaches the low coercive force permanent magnet 3 that magnetic magnetic field produces of d shaft current does not receive the influence of high-coercivity permanent magnet 4 yet, carry out easily.In addition, make the

permanent magnet

3,4 in the rotor core 2 be the high-coercivity permanent magnet, also can access same effect.

(the 19 execution mode) can be the magnetic field that the electric current through stator winding generates in each of first above-mentioned～the 18 execution mode, makes the formation of the direction of magnetization of low coercive force permanent magnet to the counter-rotating of two directions.

Attach magnetic magnetic field through what produce, reduce the magnetic flux of the permanent magnet of the footpath direction that is configured in rotor 1 or Zhou Fangxiang because of the d shaft current.Only reducing magnetic flux, is 0 o'clock at the magnetic flux of the permanent magnet that attaches magnetic, and the total flux of interlinkage that produces because of whole permanent magnets reaches minimum.Therefore, in this execution mode, the permanent magnet through further will attaching magnetic is in magnetic reversal, subtracts each other with other the magnetic flux of permanent magnet, can further reduce the total flux of interlinkage that produces because of whole permanent magnets.It is desirable to make total flux of interlinkage is 0.In view of the above, even under no load condition, run up, driven, induced voltage is also minimum, can access the few electric rotating machine of iron loss.

In addition, with regard to attaching with regard to the magnetic direction of the later permanent magnet of the second above-mentioned execution mode, identical with first execution mode shown in Figure 2.

Claims

1. permanent magnet rotary electric machine is characterized in that having:

Stator, this stator is provided with stator winding;

Rotor; This rotor is in rotor core; Low coercive force permanent magnet and high-coercivity permanent magnet have been disposed; Above-mentioned low coercive force permanent magnet has through the coercive force by the magnetic field that electric current generated of said stator winding, degree that magnetic flux density irreversibly changes, and above-mentioned high-coercivity permanent magnet has the above coercive force of twice of above-mentioned low coercive force permanent magnet

Above-mentioned low coercive force permanent magnet be through flow pulses electric current in the said stator winding change the direction of magnetization with attach magnetic force, and keep to change after the permanent magnet of magnetic force,

This permanent magnet rotary electric machine can be adjusted the whole flux of interlinkages with above-mentioned low coercive force permanent magnet and the addition of above-mentioned high-coercivity permanent magnet on a large scale.

2. permanent magnet rotary electric machine as claimed in claim 1; It is characterized in that; Near the maximum voltage of voltage at supply power of this permanent magnet rotary electric machine or when surpassing the high speed rotating of maximum voltage, reduce in order to make the interlinkage flux that produces because of above-mentioned low coercive force permanent magnet and above-mentioned high-coercivity permanent magnet, and through by the formed magnetic field of the electric current of said stator winding; Make above-mentioned low coercive force permanent magnet magnetization, adjust whole flux of interlinkages.

3. permanent magnet rotary electric machine as claimed in claim 1; It is characterized in that; When the low speed rotation below the maximum voltage of voltage at supply power of this permanent magnet rotary electric machine, increase in order to make the interlinkage flux that produces because of above-mentioned low coercive force permanent magnet and above-mentioned high-coercivity permanent magnet, and through by the formed magnetic field of the electric current of said stator winding; Make above-mentioned low coercive force permanent magnet magnetization; Near the maximum voltage of voltage at supply power of this permanent magnet rotary electric machine or when surpassing the high speed rotating of maximum voltage, reduce in order to make the interlinkage flux that produces because of above-mentioned low coercive force permanent magnet and above-mentioned high-coercivity permanent magnet, and through by the formed magnetic field of the electric current of said stator winding; Make above-mentioned low coercive force permanent magnet magnetization, the adjustment flux of interlinkage.

4. permanent magnet rotary electric machine as claimed in claim 1; It is characterized in that; Through the magnetic field that electric current generated by the said stator winding; Adjust the magnetic flux of above-mentioned low coercive force permanent magnet, making the flux of interlinkage that produces because of above-mentioned low coercive force permanent magnet and above-mentioned high-coercivity permanent magnet is 0.

5. permanent magnet rotary electric machine as claimed in claim 1 is characterized in that, makes the magnetic flux that is produced by above-mentioned low coercive force permanent magnet identical with the magnetic flux that is produced by above-mentioned high-coercivity permanent magnet.

6. permanent magnet rotary electric machine as claimed in claim 1 is characterized in that, correspondingly adjusts the interlinkage flux that produces because of above-mentioned low coercive force permanent magnet and above-mentioned high-coercivity permanent magnet with the rotating speed of this permanent magnet rotary electric machine.