WO2014065102A1

WO2014065102A1 - Permanent magnet synchronous machine, drive system using same, and compressor

Info

Publication number: WO2014065102A1
Application number: PCT/JP2013/077193
Authority: WO
Inventors: 暁史 ▲高▼橋; 恵理丸山
Original assignee: 日立アプライアンス株式会社
Priority date: 2012-10-23
Filing date: 2013-10-07
Publication date: 2014-05-01
Also published as: JP2014087142A

Abstract

The objective of the present invention is, in a permanent magnet synchronous machine using a permanent magnet with a residual magnetic flux density of 0.6 T or less, and a drive system using the permanent magnet synchronous machine, to allow reluctance torque to be effectively used, thus improving torque and efficiency. To this end, in a permanent magnet synchronous machine comprising a rotor having a permanent magnet with a residual magnetic flux density of 0.6 T or less arranged to constitute a plurality of poles in the rotor and a stator arranged with a prescribed gap with respect to the rotor, interlinkage flux Ψp (WB) for one phase of a stator coil generated by the permanent magnet and direct-axis inductance Ld (H) and quadrature-axis inductance Lq (H) when energizing the coil with a current effective value Irms (Arms), satisfy the following relationship:

Description

Permanent magnet synchronous machine, drive system using the same, and compressor

The present invention relates to a permanent magnet synchronous machine, a drive system using the same, and a compressor.

In the permanent magnet synchronous machine, an interior permanent magnet (hereinafter referred to as IPM) structure in which a permanent magnet is embedded in a rotor is widely adopted. In the IPM structure, since the ratio of the direct-axis inductance Ld and the horizontal-axis inductance Lq, the so-called salient pole ratio, is increased, it has been said that reluctance torque can be used in addition to magnet torque. Patent Document 1 discloses a technique capable of improving the torque by further optimally controlling the energization phase in a configuration in which the salient pole ratio is increased.

JP2001-11875

As a permanent magnet embedded in a permanent magnet synchronous machine having an IPM structure, it is desired to employ a magnet that does not contain neodymium as a main component and that can be stably procured, such as a ferrite magnet. Since the residual magnetic flux density of a ferrite magnet is about 1/3 that of a neodymium magnet, it can be said that utilization of reluctance torque is indispensable to cover the decrease in magnet torque.

However, depending on the application, output, and motor physique, there is an IPM structure, that is, a reluctance torque that cannot be utilized even if the salient pole ratio is increased. This is because the magnitude of the reluctance torque depends not only on the magnitude of the salient pole ratio, but also on the relative relationship with the magnet torque, but this viewpoint has been overlooked in the conventional design theory. It was. For this reason, reluctance torque cannot be used and output and efficiency cannot be improved. On the other hand, because the salient pole ratio is large, the inductance is large, leading to an increase in iron loss and making speeding up difficult. .

An object of the present invention is to enable effective use of reluctance torque in a permanent magnet synchronous machine using a permanent magnet having a residual magnetic flux density of 0.6 T or less and a drive system using the same, thereby improving torque and efficiency. It is to be.

A rotor having a permanent magnet with a residual magnetic flux density of 0.6 T or less arranged so as to form a plurality of poles therein, and a stator arranged with a predetermined gap with respect to the rotor In permanent magnet synchronous machine,
A linear flux inductance Ld (H) and a horizontal axis inductance Lq (H) when the coil is supplied with a flux linkage Ψp (WB) for one phase of the stator coil by the permanent magnet and a current effective value Irms (Arms). And

And a drive system using the same.

According to the present invention, torque and efficiency are improved.

Explanatory drawing of the structure in 1st Example of this invention Explanatory drawing of the torque characteristic in 1st Example of this invention Partial sectional view of one pole of a permanent magnet synchronous machine in the second embodiment of the present invention Explanatory drawing of temperature dependence in 2nd Example of this invention Explanatory drawing of the structure in the 3rd Example of this invention Explanatory drawing of the structure in 4th Example of this invention Cross-sectional structure diagram of a compressor in the fifth embodiment of the present invention Partial sectional view of one pole of a conventional permanent magnet synchronous machine Perspective view of 4-pole 6-slot three-phase motor 4-pole 6-slot three-phase motor stator coil connection diagram Permanent magnet motor vector illustration Permanent magnet motor vector illustration

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same symbols are attached to the same components. Their names and functions are the same, and duplicate descriptions are avoided. Further, in the following description, the inner rotor is targeted, but the effect of the present invention is not limited to the inner rotor, and can be applied to an outer rotor having a similar configuration. is there. Further, the winding method of the stator may be concentrated winding or distributed winding. Further, the number of rotor poles and the number of phases of the stator coils are not limited to the configuration of the embodiment. In the following description, an inverter-driven permanent magnet motor is targeted. However, the effect of the present invention can be applied to a self-starting permanent magnet motor.

FIG. 1 shows a first embodiment of the present invention. The present invention relates to a direct-axis inductance Ld (H) and a horizontal-axis inductance Lq when a magnetic flux linkage Ψp (Wb) for one phase of a stator coil by a permanent magnet and a current effective value Irms (Arms) are supplied to the coil. (H)

In order to satisfy the above relationship, a permanent magnet synchronous machine to which a permanent magnet having a residual magnetic flux density of 0.6 T or less is applied and a drive system using the same are configured.

First, the physical quantity and the reluctance torque generation principle will be described with reference to FIGS.
FIG. 9 is a perspective view of a 4-pole 6-slot three-phase motor. The stator 9 is composed of a stator core 10 and a stator winding 12 wound around a tooth 11, and the rotor 1 is attached to the stator 9. At the same time, the rotor 1 is rotatably arranged through a gap, and at the same time, the rotor 1 is arranged to constitute a rotor core 2 having a permanent magnet insertion hole 4 and four poles (number of pole pairs p = 2). It is comprised with the magnet 3. The stator winding 12 is configured by sequentially arranging three-phase windings U, V, and W in the circumferential direction. For example, the U-phase windings 12u1 and 12u2 connected in series as shown in FIG. An AC current iu having a peak value I (the effective value at this time is Irms) is supplied from the inverter. The same applies to the V phase and the W phase, but the current phase of each phase is shifted by 120 ° in electrical angle. The magnitudes of I and Irms can be obtained by using a device such as a wattmeter, and can also be obtained by acquiring a current waveform with an oscilloscope or the like and performing Fourier analysis.

The shaft 6 mechanically coupled to the rotor 1 is connected to a load, and by appropriately selecting the magnitude and phase of the current I, a rotational torque Me that balances the load is generated. The interlinkage magnetic flux Ψp for one phase of the stator coil drives the rotor externally with the terminals Tu, Tv, Tw of U, V, W shown in FIG. 10 open, and the phase voltage peak value E0 at that time, or It can be determined by measuring the line voltage peak value E0 * √3. Specifically, the angular frequency ω when externally driven at the rotation speed N is obtained from the equation (2) and is obtained by substituting it into the equation (3).
ω = 2π * N / 60 * p (p: number of pole pairs) (2)
Ψp = E0 / ω (3)

Incidentally, the torque Me of the magnet motor is generally generated by attraction / repulsion between the rotating magnetic field generated by the energizing currents of the stator windings U, V, and W and the rotor magnetic poles. In the case of a magnet motor, the rotor magnetic pole often refers to a magnetic field formed by a magnet, but when considering reluctance torque, the magnetic field formed by magnetizing the rotor core due to the influence of the rotating magnetic field is also the magnetic pole. It is easy to understand when considered as a kind of. In addition, since the electric current and magnetic flux at the time of the synchronous operation of a magnet motor are alternating current amounts, the method of converting into a dq axis coordinate system (rotating coordinate system) and handling as a direct current amount is common. In general, in the dq-axis coordinate system, the magnetic pole central axis of the rotor is the d-axis, and the axis advanced 90 ° counterclockwise with respect to the d-axis, that is, the central axis between permanent magnets having different polarities is the q-axis. To do. In this case, it is possible to consider various physical quantities such as torque based only on the relative positional relationship between the dq axis and the rotating magnetic field regardless of the rotor position.

Fig. 11 shows the principle of torque generation of a magnet motor. In the figure, the counterclockwise direction is the positive direction. FIG. 11A shows the magnet torque, and FIGS. 11B and 11C show the reluctance torque generated when the d-axis current is negative. As shown in FIG. 11A, the magnet torque is torque generated by attraction and repulsion between the magnetic flux generated on the d-axis and the magnetic field formed by the q-axis current. At this time, a radial repulsive force is generated between the magnet magnetic flux and the d-axis current magnetic field, but no rotational force is generated. On the other hand, as shown in FIG. 11B, when the rotor q-axis is magnetized by the q-axis current magnetic field, an attractive force and a repulsive force are generated between the rotor and the d-axis current magnetic field. This is a reluctance torque, and when the d-axis current is negative, that is, a positive torque is obtained during field-weakening operation, and a negative torque is obtained during a magnetizing action. Similarly, when the rotor d-axis is easily magnetized as shown in FIG. 11 (c), reluctance torque is generated in relation to the q-axis current magnetic field, which is negative torque and increased during field-weakening operation. At the time of magnetic action, a positive torque is obtained (generally, the sum of FIGS. 11B and 11C is called a reluctance torque).

Magnet torque is proportional to the amount of magnetic flux generated by the magnet if the q-axis current is constant. That is, in order to increase the magnet torque, it is necessary to increase the amount of magnets or use a strong magnet, resulting in an increase in cost. On the other hand, since the reluctance torque is proportional to the difference between the q-axis and q-axis inductances, the torque can be increased to a certain amount by configuring the rotor magnetic circuit so that the difference between the two is large. It has been considered possible.

Now, among the constituent physical quantities of the formula (1), Ψp and Irms are obtained in the above-described manner, whereas the method for obtaining Ld and Lq is a rotor stationary method such as the Dalton-Cameron method or the like. There is a method of calculating backward from a vector diagram as described below.

FIG. 12 shows a vector diagram of the dq axis coordinate system. That is, using the phase of the interlinkage magnetic flux Ψp for one phase of the stator coil by the permanent magnet as a reference, this is regarded as the d-axis, and the induced electromotive force E0 that is a time derivative of Ψp is generated on the q-axis whose phase is advanced by 90 ° To do. When the voltage V applied to the motor and the current I applied to the motor have a phase difference of θ and β with respect to E0, V and I are d-axis as shown in equations (4) and (5). It can be decomposed into components and q-axis components.

The resistance R in FIG. 12 can be measured by using a resistance measuring instrument such as a Wheatstone bridge. Further, the voltage phase difference angle θ and the current phase difference angle β can be obtained by acquiring the waveforms of E0, V, and I and determining the phase relationship of each fundamental wave component. FIG. 12 shows the case where the phase voltage and phase current waveforms are used. For example, even when the line voltage is obtained instead of the phase voltage, the phase difference between the phase voltage and the line voltage should be considered. Thus, θ and β can be obtained in the same manner.

Using the physical quantities obtained above, Ld and Lq can be obtained from the voltage equation of Equation (6).

In the above, the physical quantity of formula (1) and the generation principle of reluctance torque have been described.

Next, the basic principle of the present invention, that is, the configuration described in the equation (1) enables effective use of reluctance torque regardless of the application, output, and motor physique, thereby improving torque and efficiency. Explain the principle that can.

In general, the generated torque Me is expressed by the following equation using the number of pole pairs p, the interlinkage magnetic flux Ψp for one phase of the stator coil by a permanent magnet, the direct current Id, and the horizontal current Iq.

However, Id, Iq, and Ψp are peak values.
In Expression (7), the first term in {} represents the magnet torque, and the second term represents the reluctance torque. As is apparent from this equation, the reluctance torque is proportional to Lq−Ld, Id, and Iq, respectively. Therefore, conventionally, the salient pole ratio Lq / Ld or Lq-Ld has been used as an index of the magnitude of the reluctance torque. However, how much the reluctance torque contributes to the generated torque Me is determined by a relative relationship with the magnet torque. Therefore, in addition to the conventional salient pole ratio, another physical quantity that can take into account the relative relationship with the magnet torque needs to be newly introduced into the index representing the magnitude of the reluctance torque.

Here, the magnet torque becomes maximum when the current phase difference angle β = 0, and the maximum values Mp and max can be expressed by the following equations from equations (5) and (7).

On the other hand, the reluctance torque becomes maximum when β = π / 4 (45 deg. In electrical angle), and the maximum values Mr and max can be expressed by the following equations from equations (5) and (7).

Since the ratio of the equations (8) and (9) is nothing but an index representing the magnitude of the reluctance torque, this ratio is defined as the reluctance torque ratio α. When using the current peak I

When the effective current value Irms is used,

It becomes. In the present invention, Expression (11) using the current effective value Irms is used.

As is clear from Equation (11), it can be seen that Ψp and Irms are newly introduced as an index representing the magnitude of the reluctance torque in addition to the conventional Ld and Lq. Of these, Ψp is determined by the physical properties and shape of the permanent magnet, the stator winding specifications, and the motor cross-sectional shape, and can be obtained from a general induced electromotive force measurement test. Similarly, Ld and Lq are also determined by the motor configuration and energization current Irms, and can be obtained by a general motor inductance measurement method. Therefore, Ψp, Ld, and Lq are constants determined for each motor, and Equation (11) can be treated as a linear function of α and Irms.

The reluctance torque ratio α can take an arbitrary value by changing the right side of the equation (11), in particular, the current value. From the viewpoint of improving the generated torque and improving the efficiency, the reluctance torque ratio α is as shown in FIG. Β = 45 deg. At which the torque Mr becomes maximum. In this case, it is desirable that the generated torque Me is equal to or greater than the magnet torque maximum values Mp and max. That is,

The relationship should be established. When formula (12) is arranged,

Then, further deformation using equation (11) yields equation (1).

From the above, it is necessary to introduce Ψp, Irms in addition to the conventional Ld and Lq as an index indicating the magnitude of the reluctance torque, and the reluctance torque is effectively utilized regardless of the application, output, and motor physique. Therefore, it was shown that the relational expression of the formula (1) needs to be satisfied.

By the way, when the above-described permanent magnet synchronous machine is driven, the current phase difference angle β can be arbitrarily set by the configuration of the control software. However, in the configuration satisfying the expression (1), the control that generates the maximum torque is performed. The operating point is 22.5 deg. ≦ β ≦ 45.0 deg. Exists in the range. Therefore, the torque and the efficiency can be improved more reliably by controlling the phase so as to be the above-mentioned phase.

The second embodiment of the present invention will be described below with reference to the drawings.
FIG. 3 is a partial cross-sectional view of one pole of the permanent magnet synchronous machine according to this embodiment. By applying the configuration and the control method shown in the first embodiment to the configuration of FIG. 3, the reluctance torque can be further increased. The rotor 1 shown in FIG. 3 has a magnet receiving hole 4 configured to protrude radially inward, and a permanent magnet 3 (not shown) is disposed in the receiving hole 4, so that the permanent The magnet 3 has two bending points in the circumferential direction per pole, and is configured to extend in the direction perpendicular to the magnetization direction and toward the end of the pole, with each bending point as a starting end. As the permanent magnet 3, a permanent magnet having a low residual magnetic flux density such as a ferrite magnet is used. The permanent magnet 3 may be configured to have a plurality of bending points and straight portions at three or more locations.

By adopting such a magnet shape, the surface area of the magnet magnetic flux generating surface can be increased, so that it is possible to generate a larger magnet torque than that using a U-shaped magnet as shown in FIG. At the same time, since the cross-sectional area of the iron core in the radially outer peripheral portion of the permanent magnet 3 is increased, the salient pole ratio is increased and a reluctance torque larger than that in FIG. 8 can be generated. Note that the permanent magnet 3 may be integrally formed without being divided in the circumferential direction per pole, or a plurality of permanent magnets 3 may be arranged in the circumferential direction. Further, a plurality of parts may be divided in the axial direction, or may be formed integrally without being divided. The rotor core 2 may be composed of laminated steel plates stacked in the axial direction, may be composed of a dust core, or may be composed of amorphous metal.

Furthermore, according to the present invention, a permanent magnet synchronous machine driven continuously or intermittently at an ambient temperature of 80 ° C. or higher and a drive system using the same can improve torque and improve efficiency more effectively. Can do. The reason for this will be described below. The residual magnetic flux density (Br) of a ferrite magnet at room temperature (20 ° C.) is known to be 1/3 that of a neodymium magnet, but the temperature coefficient of Br of a ferrite magnet is more than twice that of a neodymium magnet. As the temperature increases, the decrease in Br becomes more significant.

Specifically, the temperature coefficient of neodymium magnets is about -0.11% / K, while that of ferrite magnets is about -0.26% / K. Therefore, as shown in FIG. 3, the Br ratio with respect to the neodymium magnet decreases as the ambient temperature increases. In particular, when the ambient temperature is 80 ° C. or higher, the tendency of Br to decrease becomes significant. Therefore, although the magnet torque is significantly reduced, the reluctance torque can be effectively utilized by applying the present invention, so that the torque and efficiency can be improved.

The third embodiment of the present invention will be described below with reference to the drawings.
FIG. 5 shows a third embodiment of the present invention. The configuration of FIG. 5 is different from FIG. 1 in that the relationship between Ψp, Irms, Ld, and Lq is

Since other configurations are the same as those in FIG. 1, the description thereof is omitted.

Currently, permanent magnet synchronous machines using neodymium magnets are applied to a wide range of fields such as home appliances and automobiles, and a role as an alternative to them is required for permanent magnet synchronous machines using ferrite magnets (herein " “Replacement” is not a replacement for a power source, but means that torque characteristics and efficiency characteristics can be maintained at the same level as before.The reason why performance degradation is not allowed is to prevent global warming in addition to intense competition among industry companies. For example, the existence of CO2 reduction target values for the future, a review of the global energy supply system triggered by the nuclear accident in Japan, and an increase in energy consumption control needs).

However, many permanent magnet synchronous machines using neodymium magnets that have been developed so far have settled in the configuration shown in Formula (1) as a result of cut and try in the development process. Therefore, further utilization of reluctance torque is indispensable in order to achieve a torque and efficiency equal to or higher than those of the ferrite magnet. For example, in a permanent magnet synchronous machine using a neodymium magnet, when the reluctance torque ratio α is 0.293, the ratio of the magnet torque to the generated torque is 0.707. If this is replaced with a ferrite magnet, the magnet torque will be reduced to 1/3, and it is necessary to cover the decrease with the reluctance torque. That is, the reluctance torque ratio α is set to

It is necessary to do more.

As described above, by configuring a permanent magnet synchronous machine using a ferrite magnet and a drive system using the same so as to satisfy Equation (14), the reluctance torque can be effectively used regardless of the application, output, and motor size. Thus, torque and efficiency can be improved, and at the same time, a permanent magnet synchronous machine using a neodymium magnet can be replaced.

The fourth embodiment of the present invention will be described below with reference to the drawings.
FIG. 6 shows a fourth embodiment of the present invention. 6 differs from FIG. 1 in that the relationship between Ψp, Irms, Ld, and Lq is

And a permanent magnet synchronous machine to which a magnet mainly composed of SmFeN (hereinafter referred to as SmFeN magnet) is applied and a drive system using the same are configured. Other configurations are the same as those in FIG.

The SmFeN magnet has a residual magnetic flux density as small as 1/2 that of a neodymium magnet, but is larger than a ferrite magnet, and thus is useful as an alternative to a neodymium magnet. As in the third embodiment, when a neodymium synchronous machine having a reluctance torque ratio α of 0.293 is replaced with an SmFeN magnet, the magnet torque is reduced to ½, and the decrease is covered by the reluctance torque. -There is a need to. That is, the reluctance torque ratio α is set to

It is necessary to do more.

As described above, the permanent magnet synchronous machine using the SmFeN magnet and the drive system using the same are configured so as to satisfy the expression (11), so that the reluctance torque can be effectively used regardless of the application, output, and motor size. Thus, torque and efficiency can be improved, and at the same time, a permanent magnet synchronous machine using a neodymium magnet can be replaced.

The fifth embodiment of the present invention will be described below with reference to the drawings.
FIG. 7 is a sectional structural view of the compressor according to the present embodiment. In FIG. 7, the compression mechanism unit meshes a spiral wrap 15 standing upright on the end plate 14 of the fixed scroll member 13 and a spiral wrap 18 standing upright on the end plate 17 of the turning scroll member 16. Is formed. The revolving scroll member 16 is revolved by the crankshaft 6 to perform a compression operation. Of the compression chambers 19 (19A, 19B,...) Formed by the fixed scroll member 13 and the swivel scroll member 16, the compression chamber 19 located on the outermost diameter side is accompanied by a swirl motion. The

scroll members

13 and 16 move toward the center, and the volume gradually decreases.

When the compression chambers 19A and 19B reach the vicinity of the centers of the

scroll members

13 and 16, the compressed gas in the compression chambers 19 is discharged from the discharge port 20 communicating with the compression chamber 19. The discharged compressed gas passes through a gas passage (not shown) provided in the fixed scroll member 13 and the frame 21 and reaches the pressure vessel 22 below the frame 21, and the side wall of the pressure vessel 22. Is discharged from the discharge pipe 23 provided outside the compressor. A permanent magnet motor 103 composed of the stator 9 and the rotor 1 is enclosed in the pressure vessel 22, and the compression operation is performed by the rotation of the rotor 1. An oil sump 25 is provided below the permanent magnet motor 103. The oil in the oil sump 25 passes through an oil hole 26 provided in the crankshaft 6 due to a pressure difference caused by a rotational motion, and a sliding portion between the turning scroll member 16 and the crankshaft 6 and a sliding bearing 27. It is used for lubrication. A terminal box 30 for pulling out the stator coil 12 to the outside of the pressure vessel 22 is provided on the side wall of the pressure vessel 22. For example, in the case of a three-phase permanent magnet motor, terminals of U, V and W windings are provided. There are a total of three.

In many current home and commercial air conditioners, R410A refrigerant is sealed in the compressor 22 and the ambient temperature of the permanent magnet motor 103 is often 80 ° C. or higher. In the future, as the adoption of R32 refrigerant having a smaller global warming potential progresses, the ambient temperature further increases, and thus the Br decrease in the magnet becomes more prominent. Even in such a case, it is possible to improve the torque and the efficiency by applying the configurations described in the first to fourth embodiments of the present invention.
The compressor configuration may be a scroll compressor shown in FIG. 7, a rotary compressor, or a configuration having other compression mechanisms. According to the present invention, as described above, a small and high output motor can be realized. Then, it becomes possible to widen the operating range, such as enabling high-speed operation. Further, in refrigerants such as He and R32, leakage from gaps is larger than refrigerants such as R22, R407C, and R410A, and in particular, low speeds. During operation, the ratio of leakage to the circulation amount is significantly increased, so that the efficiency is greatly reduced. Reducing leakage loss by reducing the size of the compression mechanism and increasing the rotational speed to obtain the same amount of circulation can be an effective means to improve efficiency during low circulation (low speed operation). It is necessary to increase the maximum number of revolutions in order to secure the circulation rate. According to the present invention, since the maximum torque can be increased, the maximum number of revolutions can be increased, which is an effective means for improving the efficiency of refrigerants such as He and R32.

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 ... Rotor iron core, 3 ... Permanent magnet, 4 ... Permanent magnet insertion hole, 5 ... Riveting for caulking, 6 ... Shaft or crankshaft, 9 ... Stator, 10 ... Stator iron core, 11 ... Teeth 12 ... Stator coil, 13 ... Fixed scroll member, 14 ... End plate, 15 ... Spiral wrap, 16 ... Swivel scroll member, 17 ... End plate, 18 ... Spiral wrap, 19 ... Compression chamber, DESCRIPTION OF SYMBOLS 20 ... Discharge port, 21 ... Frame, 22 ... Pressure vessel, 23 ... Discharge pipe, 25 ... Oil reservoir, 26 ... Oil hole, 27 ... Sliding bearing, 30 ... Terminal box, 103 ... Permanent magnet motor

Claims

A stator having a plurality of teeth;
In a permanent magnet synchronous machine comprising a rotor disposed on the inner peripheral side with a predetermined gap with respect to the stator,
In the rotor, a plurality of permanent magnets are arranged so as to constitute a plurality of poles therein, and the residual magnetic flux density of the permanent magnet is 0.6 T or less,
A linear flux inductance Ld (H) and a horizontal axis inductance Lq (H) when the coil is supplied with a flux linkage Ψp (WB) for one phase of the stator coil by the permanent magnet and a current effective value Irms (Arms). And

And a drive system using the same.
In claim 1,
The rotor has a magnet housing hole configured to be convex radially inward,
A ferrite magnet is disposed in the magnet accommodation hole,
The permanent magnet has at least two bending points in the circumferential direction per pole, and at least two linear portions extending from the respective bending points to the direction perpendicular to the magnetization direction and toward the end of the pole. A permanent magnet synchronous machine and a drive system using the same.
A stator having a plurality of teeth;
In a permanent magnet synchronous machine comprising a rotor disposed on the inner peripheral side with a predetermined gap with respect to the stator,
The rotor is provided with a plurality of permanent magnets so as to form a plurality of poles therein,
A linear flux inductance Ld (H) and a horizontal axis inductance Lq (H) when the coil is supplied with a flux linkage Ψp (WB) for one phase of the stator coil by the permanent magnet and a current effective value Irms (Arms). And

And a drive system using the same.
Permanent magnet synchronous machine comprising: a rotor having a magnet composed mainly of SMFeN arranged so as to form a plurality of poles therein; and a stator arranged with a predetermined gap with respect to the rotor In
A linear flux inductance Ld (H) and a horizontal axis inductance Lq (H) when the coil is supplied with a flux linkage Ψp (WB) for one phase of the stator coil by the permanent magnet and a current effective value Irms (Arms). And

And a drive system using the same.
In any one of Claim 1-4,
A permanent magnet synchronous machine and a drive system using the same are driven continuously or intermittently at an ambient temperature of 80 ° C. or higher.
In claims 1 to 5,
The phase of the current supplied from the inverter to the permanent magnet synchronous machine is a lead phase of 22.5 ° to 45.0 ° with respect to the phase of the induced electromotive force of one phase of the stator coil by the permanent magnet. And a drive system using the same.
In a compressor provided with a compression mechanism that sucks in and compresses and discharges the refrigerant, and a permanent magnet motor that drives the compression mechanism,
The permanent magnet motor is disposed with a rotor having a permanent magnet with a residual magnetic flux density of 0.6 T or less arranged so as to form a plurality of poles, and a predetermined gap with respect to the rotor. And a stator
A linear flux inductance Ld (H) and a horizontal axis inductance Lq (H) when the coil is supplied with a flux linkage Ψp (WB) for one phase of the stator coil by the permanent magnet and a current effective value Irms (Arms). And

While satisfying the relationship
An R32 refrigerant is sealed in the compressor.