CN113489178A - Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor - Google Patents

Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor Download PDF

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CN113489178A
CN113489178A CN202110784593.5A CN202110784593A CN113489178A CN 113489178 A CN113489178 A CN 113489178A CN 202110784593 A CN202110784593 A CN 202110784593A CN 113489178 A CN113489178 A CN 113489178A
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pole
permanent magnet
reluctance
magnetic
axis
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CN113489178B (en
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李健
王凯
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Priority to PCT/CN2022/073898 priority patent/WO2023284283A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

The invention discloses a wide-area-running alternating-pole permanent magnet auxiliary synchronous reluctance motor, which comprises a stator and an alternating-pole synchronous reluctance rotor, wherein the stator is provided with a stator core and a stator core; the stator comprises a stator iron core and an armature winding; the number of pole pairs of the armature winding is equal to that of the alternate pole type synchronous reluctance rotor; the alternating pole type synchronous reluctance rotor comprises a rotor core, and reluctance poles and permanent magnet poles which are arranged on the rotor core along the circumferential direction; the number of pole pairs of the magnetic resistance poles is more than or equal to that of the permanent magnet poles; the direct-axis magnetic circuit of the reluctance pole is closed through the iron core, and the reluctance of the direct-axis magnetic circuit of the reluctance pole is smaller than that of the quadrature-axis magnetic circuit thereof, so that the reluctance of the quadrature-axis magnetic circuit can be obtainedThe reverse salient pole characteristic is obtained. The invention has the characteristic of reverse salient pole, and adopts the positivei d By using the reluctance torque, the permanent magnet can be prevented from generating irreversible demagnetization. Meanwhile, a direct-axis magnetic circuit of the magnetic resistance pole is closed through the iron core, so that larger direct-axis inductance can be obtained, and the weak magnetic speed expansion capability is stronger. In the full-speed operation range, the current angle adjusting range of the invention is wide, thus the constant-power speed adjusting range can be widened.

Description

Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor
Technical Field
The invention relates to the field of motor design and manufacture, in particular to a wide-area-running alternating-pole permanent magnet auxiliary synchronous reluctance motor.
Background
Permanent magnet motors have the advantages of high torque/power density, high efficiency, high power factor, etc., and have been used in a number of fields. Rotor permanent magnet motors can be classified into surface-mounted permanent magnet motors and interior permanent magnet motors according to the mounting manner of permanent magnets on a rotor. In applications requiring wide-range speed regulation (wide-area) operation, such as electric vehicles, a built-in permanent magnet motor is often used.
Electromagnetic torque T of permanent magnet motoreThe expression is shown as formula (1).
Figure BDA0003158705080000011
In the formula (1), p is the pole pair number of the motor, psipmIs a permanent magnetic flux linkage, LdAnd LqRespectively a direct axis inductor and a quadrature axis inductor, idAnd iqThe direct-axis current (excitation component) and quadrature-axis current of the armature winding are respectively. I isaIs the peak value of the sinusoidal phase current and β is the current phase angle (referred to as current angle for short). T ispmIs the permanent magnet torque component; t isrIs a reluctance torque component generated by the saliency effect.
Conventional interior permanent magnet machines pass through a positive salient pole (L)qGreater than Ld) Reluctance torque is designed to improve torque output capability when operating below base speed (low speed region). And they usually employ flux weakening control (i.e. control of the direct current of the armature winding to be negative, -i)d) To achieve speed-expanding (high-speed zone) operation.
However, the conventional positive salient pole interior permanent magnet motor has the problems of difficulty in considering high power density, wide rotating speed operation range, demagnetization resistance, high reliability and low cost, and the specific expression is as follows:
1) due to Lq＞Ld(the direct-axis magnetic resistance is larger than the quadrature-axis magnetic resistance), when the positive salient pole built-in permanent magnet motor utilizes the magnetic resistance torque in a low-speed region, the negative direct-axis current (i.e. -i) must be adoptedd) The risk of irreversible demagnetization of the permanent magnet increases.
2) If the irreversible demagnetization risk is reduced, the thickness of the permanent magnet must be increased, and then the cost of the permanent magnet material (note: rare earth permanent magnetic materials are non-renewable natural resources and strategic resources).
3) And a direct-axis magnetic circuit of the permanent magnet motor with the built-in positive salient pole passes through the permanent magnet, so that the direct-axis inductance is small (the direct-axis magnetic resistance is large). The increased thickness of the permanent magnet further reduces the direct-axis inductance (note: the weak magnetic capacity is closely related to the direct-axis inductance), thereby reducing the weak magnetic capacity and limiting the speed-expanding operation range.
4) The positive salient pole built-in permanent magnet motor has large no-load back electromotive force, and when a fault occurs during high-speed operation, not only a large short-circuit current (which is easy to damage the motor) is likely to be generated, but also a weak magnetic failure is likely to occur to generate a feedback power generation condition (which is easy to damage a power device in a control system), so that the reliability is reduced.
In addition, in the application occasions requiring constant voltage power generation in a wide rotating speed range, such as an aviation power supply, a ship power supply and the like, the traditional surface-mounted permanent magnet motor and the positive salient pole built-in permanent magnet motor still face the problems, wherein the most prominent is the narrow constant voltage power generation range and the difficulty in failure demagnetization caused by the difficulty in magnetic adjustment, so that the application of the permanent magnet motor and the positive salient pole built-in permanent magnet motor to the occasions requiring wide-area operation is further limited.
Disclosure of Invention
The present invention is directed to a wide-area alternating-pole permanent-magnet-assisted synchronous reluctance machine having a reverse salient pole characteristic, and using a positive idBy using the reluctance torque, the permanent magnet can be prevented from generating irreversible demagnetization.
In order to solve the technical problems, the invention adopts the technical scheme that:
a wide-area-running alternating-pole permanent magnet auxiliary synchronous reluctance motor comprises a stator and an alternating-pole synchronous reluctance rotor which are coaxially arranged in sequence from outside to inside or from inside to outside.
The stator comprises a stator core and an armature winding wound in stator slots of the stator core; the number of pole pairs of the armature winding is equal to that of the alternate pole type synchronous reluctance rotor, and is p.
The alternating pole type synchronous reluctance rotor comprises a rotor core, and reluctance poles and permanent magnet poles which are arranged on the rotor core along the circumferential direction; pole pair number p of magneto-resistive polerNumber p of pole pairs greater than or equal to the permanent magnet polemAnd p isr+pm＝p。
The direct-axis magnetic circuit of the reluctance pole is closed through the rotor core, and the reluctance of the direct-axis magnetic circuit of the reluctance pole is smaller than that of the quadrature-axis magnetic circuit of the reluctance pole, so that the alternating pole type permanent magnet auxiliary synchronous reluctance motor can obtain the anti-salient pole characteristic, and at the moment, the quadrature-axis inductance L of the armature windingq< direct axis inductance Ld。
The reluctance poles and the permanent magnet poles are symmetrically distributed over the entire mechanical circumference of the rotor core.
For the permanent magnet poles and the magnetic resistance poles which are connected in the circumferential direction, the straight axis central line of the magnetic resistance pole and the central line of the permanent magnet pole have a pole distance.
The magnetic resistance is one or a combination of a magnetic barrier and a salient pole.
When the magnetic resistance pole is the magnetic barrier, the magnetic barrier is arranged on the quadrature axis magnetic circuit, and the magnetic resistance of the quadrature axis magnetic circuit can be increased.
When the magnetic resistance is salient pole, the straight axis is the central line of the salient pole;
when the magnetic resistance is the combination of the magnetic barrier and the salient pole, the magnetic barrier is arranged on the quadrature axis magnetic circuit, and the direct axis is the central line of the salient pole.
When the magnetic resistance poles are magnetic barriers, the magnetic barriers in each magnetic resistance pole are symmetrically distributed.
The magnetic barrier is also arranged in the quadrature-axis magnetic circuit of the permanent magnet poles, so that the direct-axis magnetic circuit reluctance of the permanent magnet poles is also smaller than the quadrature-axis magnetic circuit reluctance of the permanent magnet poles, and the anti-salient pole characteristic of the alternating pole type permanent magnet auxiliary synchronous reluctance motor is further enhanced.
The permanent magnet pole has an offset angle relative to the reluctance pole, and the offset angle is smaller than or equal to 1/4 pole pitch, so that the current angle of the maximum torque obtained by the permanent magnet torque approaches the current angle of the maximum torque obtained by the reluctance torque, and the utilization rate of the permanent magnet torque and the reluctance torque is improved.
The offset gap of the permanent magnet pole relative to the magnetic resistance pole is filled with magnetic barrier or non-magnetic conductive material.
An alternating current excitation winding is wound in a stator slot of the stator core, and the number of pole pairs of the alternating current excitation winding is also equal to the number of pole pairs p of the rotor; the armature winding is connected with a direct current load through a controllable rectifier; the alternating current excitation winding is connected with a direct current power supply through an inverter; by controlling the controllable rectifier, the quadrature axis current and the direct axis current in the armature winding can be adjusted, so that voltage regulation is realized; the air gap magnetic field, the armature winding flux linkage and the load voltage can be adjusted by adjusting the size and the direction of the direct-axis current in the alternating-current excitation winding; the voltage regulation characteristic is further improved by cooperatively controlling the alternating current exciting winding current and the armature winding end controllable rectifier.
The invention has the following beneficial effects:
1. the invention has the characteristic of reverse salient pole (namely L)q＜Ld). When operating below the base speed (low speed region), positive i is useddReluctance torque is utilized. Positive idIn order to increase the magnetic current, the irreversible demagnetization of the permanent magnet is avoided.
2. Because the straight-axis magnetic circuit of the magnetic resistance pole is closed by the iron core, the invention can obtain larger straight-axis inductance and stronger weak magnetic speed-expanding capability.
3. The current angle regulation range of the invention is wide (i) in the full-speed operation rangedAnd the constant power speed regulation range can be widened by the invention.
4. The no-load back electromotive force of the invention is low, and the invention has stronger short-circuit current inhibition capability and higher reliability.
5. The invention adopts permanent magnet polar offset to ensure that the current angle of the maximum torque obtained by the permanent magnet torque approaches the current angle of the maximum torque obtained by the reluctance torque (called moment angle approach for short), thereby improving the synthesis rate of the permanent magnet torque and the reluctance torque and improving the output torque.
6. When the voltage-regulating type permanent magnet synchronous motor is used for constant-voltage power generation, the armature winding can be split into two sets of windings (namely the armature winding and the alternating-current excitation winding), and the voltage-regulating characteristic can be further improved by cooperatively controlling the current of the alternating-current excitation winding and the controllable rectifier at the end of the armature winding.
Drawings
Fig. 1 shows a schematic structure of the magnetic barrier of example 1.
Fig. 2 shows a schematic configuration of the synchronous reluctance motor of embodiment 1, which is a 24-slot 8-pole motor.
Fig. 3 is a schematic diagram showing the torque variation with the current angle (abbreviated as a moment angle characteristic) in example 1.
Fig. 4 shows a schematic diagram of permanent magnet pole shift in the synchronous reluctance rotor of the alternating pole type in embodiment 2.
Fig. 5 shows a comparison of the moment angle characteristics of example 1 and example 2.
FIG. 6 shows that p is 4 and p is as in example 3r＝2，pmThe structure is shown as 2.
FIG. 7 shows that p is 4 and p isr＝2，pmThe structure is shown as 2.
Fig. 8 is a schematic view showing the structure of the synchronous reluctance motor of embodiment 5 in the case of an 18-slot 6-pole motor.
FIG. 9 shows that p is 3 and p is as in example 6r＝2，pmThe structure is shown as 1.
FIG. 10 is a view showing a combination of salient poles and magnetic barriers in the magnetic reluctance pole of example 7.
FIG. 11 is a schematic view showing the structure of a constant voltage power generation system according to example 8.
Among them are:
1. a stator core; 11. an armature winding;
2. a rotor core;
21. a permanent magnet pole; 22. permanent magnet pole offset gaps; 23. a magnetoresistive electrode; 24. crossed-axis magnetic barriers; 25. a mechanical connecting bridge; 26. salient pole edges; 27. permanent magnets are built in.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
Example 1
Three phases m is 3, Ns is 24, p is 4, pr＝3，p m1 as an example; as shown in FIG. 2)
As shown in fig. 2, the alternating-pole permanent-magnet-assisted synchronous reluctance machine with wide-area operation includes a stator and an alternating-pole synchronous reluctance rotor coaxially arranged in sequence from outside to inside.
Alternatively, the alternating-pole synchronous reluctance rotor may also be coaxially sleeved on the periphery of the stator, i.e., the outer rotor.
The stator comprises a stator core 1 and armature windings 11 wound in stator slots of the stator core.
The number of the stator slots is preferably Ns-24, the armature winding preferably comprises A, B, C three-phase windings, wherein the A phase can be formed by connecting A1, A2, A3 and A4 coils in series, or can be respectively connected in series and then connected in parallel by A1-A2 and A3-A4; and the phases B and C are analogized in the same way.
The number of pole pairs of the armature winding is equal to that of the alternating-pole synchronous reluctance rotor, and p is preferably 4.
The alternating-pole synchronous reluctance rotor includes a rotor core 2, and reluctance poles 23 and permanent magnet poles 21 circumferentially arranged on the rotor core.
The stator core and the rotor core are made of magnetic materials.
Pole pair number p of magneto-resistive polerNumber p of pole pairs greater than or equal to the permanent magnet polemAnd p isr+pmP. In this example 1, p is preferabler＝3，p m1. According to different application occasions and requirements, the pole pairs of the magnetic resistance pole and the permanent magnet pole and the specific structural shape of each magnetic pole can be flexibly selectedFormula (II) is shown.
In this embodiment 1, to avoid introducing unbalanced magnetic pull, the reluctance poles and the permanent magnet poles are symmetrically distributed over the entire mechanical circumference of the rotor core.
As shown in fig. 1, the magnetic resistance pole adopts a magnetic barrier, and the permanent magnet pole adopts a surface-mounted permanent magnet.
For the permanent magnet pole and the magnetic resistance pole which are connected in the circumference, the difference between the straight axis central line of the magnetic resistance pole and the central line of the permanent magnet pole is 0.9-1.1 times of the pole distance. In this embodiment, the straight axis centerline of the reluctance pole and the centerline of the permanent magnet pole preferably differ by one pole pitch.
And magnetic barriers in the magnetic resistance poles are arranged on the quadrature-axis magnetic circuit, so that the magnetic resistance of the quadrature-axis magnetic circuit is increased. The magnetic barriers of each magnetic resistance pole are symmetrically distributed.
The magnetic barriers arranged on the quadrature magnetic circuit, referred to as quadrature magnetic barriers 24, are the same as follows. As shown in fig. 1, both sides of each quadrature magnetic barrier are provided with mechanical connection bridges 25.
The direct-axis magnetic circuit of the reluctance pole is closed through the rotor core, and the reluctance of the direct-axis magnetic circuit of the reluctance pole is smaller than that of the quadrature-axis magnetic circuit of the reluctance pole, so that the alternating pole type permanent magnet auxiliary synchronous reluctance motor can obtain the anti-salient pole characteristic, and at the moment, the quadrature-axis inductance L of the armature windingq< direct axis inductance Ld。
As shown in FIG. 3, a positive i is useddA positive reluctance torque can be obtained; i.e. the invention can pass through positive idReluctance torque is utilized.
The permanent magnet poles of the embodiment are also provided with quadrature magnetic barriers, so that the direct-axis magnetic circuit reluctance of the permanent magnet poles is also smaller than the quadrature-axis magnetic circuit reluctance of the permanent magnet poles, and the anti-salient pole characteristic of the motor is further enhanced.
Example 2: permanent magnet pole offset in example 1
As can be seen from fig. 3, the permanent magnet torque takes a maximum value at a current angle of 0 degrees, and the reluctance torque takes a maximum value at a current angle of-45 degrees; this results in the combined torque maximum of the two not being the sum of their maximum values; the torque synthesis rate is low. Therefore, in example 2, in addition to example 1, the permanent magnet poles are angularly displaced, as shown in fig. 4.
The offset angle of the permanent magnet poles relative to the reluctance poles is preferably smaller than or equal to 1/4 pole pitch, in this embodiment, 1/8 pole pitch is preferred, so that the current angle of the permanent magnet torque for obtaining the maximum torque approaches the current angle of the reluctance torque for obtaining the maximum torque (for short, the moment angle approaches), thereby improving the synthesis rate of the permanent magnet torque and the reluctance torque and improving the output torque. As can be seen from fig. 5, the current angle to achieve the maximum torque increases negatively after the moment angle is approximated, and the maximum torque achieved is greater than that of example 1.
Further, an offset gap (also referred to as a permanent magnet pole offset gap 22) of the permanent magnet pole relative to the magnetic resistance pole is filled with a magnetic barrier or a non-magnetic conductive material.
Example 3: p is 4, pr＝2、pm＝2
As shown in fig. 6, there are two permanent magnet poles in contact with each other, and there are also two reluctance poles in contact with each other.
Example 4: p is 4, pr＝2、pm＝2
As shown in fig. 7, no crossed magnetic barrier is provided between the permanent magnet poles that are connected.
Example 5
As shown in fig. 8, the number of armature winding phases m is 3, the number of stator slots Ns is 18, the number of motor pole pairs p is 3, and p is shownr＝2、pmThe structure of the synchronous reluctance motor is shown as 1.
Example 6
As shown in fig. 9, p is 3, pr＝2、pmThe structure of the synchronous reluctance motor is shown as 1, and the permanent magnet pole adopts the built-in permanent magnet 27. The built-in permanent magnet may be in a shape of a straight line, V, C, W, U, or the like, or may be in a multilayer hybrid type.
Example 7
As shown in fig. 10, the manner in which the reluctance poles are combined with the magnetic barriers is shown. In this case, the magnetic barriers are disposed on the quadrature magnetic path, and the direct axis is the center line of the salient pole. At the salient pole edge 26, is a thicker air gap region of non-uniform air gap. Alternatively, the reluctance poles can be only salient poles, in which case, the direct axis is the center line of the salient poles, and the quadrature magnetic circuit passes through the thicker air gap region of the non-uniform air gap, so that the reluctance of the quadrature magnetic circuit is also increased.
Example 8
As shown in fig. 11, when the present invention is applied to a constant voltage power generation field, the armature winding of the present invention can be split into two sets of winding windings, i.e. the armature winding and the ac excitation winding, and the number of pole pairs of the ac excitation winding is also equal to the number of pole pairs p of the rotor.
The armature winding is connected with a direct current load through a controllable rectifier, and the alternating current exciting winding is connected with a direct current power supply through an inverter. Therefore, the voltage regulation can be carried out by adopting one or a combination of the following modes:
1. by controlling the controllable rectifier at the end of the armature winding, the quadrature-axis current and the direct-axis current in the armature winding can be adjusted, so that the voltage regulation is realized.
2. The size and direction of direct-axis current in the alternating-current excitation winding are adjusted, so that the air-gap magnetic field, armature winding flux linkage and load voltage can be adjusted.
3. The current of the alternating current excitation winding and the controllable rectifier at the armature winding end are cooperatively controlled, so that the voltage regulation characteristic is further improved.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.

Claims (10)

1. The utility model provides a synchronous reluctance motor is assisted to alternating polar type permanent magnetism of wide area operation which characterized in that: the synchronous reluctance motor comprises a stator and an alternating-pole synchronous reluctance rotor which are coaxially arranged in sequence from outside to inside or from inside to outside;
the stator comprises a stator core and an armature winding wound in stator slots of the stator core; the number of pole pairs of the armature winding is equal to that of the alternate pole type synchronous reluctance rotor, and is p;
the alternating pole type synchronous reluctance rotor comprises a rotor core, and reluctance poles and permanent magnet poles which are arranged on the rotor core along the circumferential direction; pole pair number p of magneto-resistive polerNumber p of pole pairs greater than or equal to the permanent magnet polemAnd p isr+pm＝p；
The direct-axis magnetic circuit of the reluctance pole is closed through the rotor core, and the reluctance of the direct-axis magnetic circuit of the reluctance pole is smaller than that of the quadrature-axis magnetic circuit of the reluctance pole, so that the alternating pole type permanent magnet auxiliary synchronous reluctance motor can obtain the anti-salient pole characteristic, and at the moment, the quadrature-axis inductance L of the armature windingq< direct axis inductance Ld。
2. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: the reluctance poles and the permanent magnet poles are symmetrically distributed over the entire mechanical circumference of the rotor core.
3. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: for the permanent magnet poles and the magnetic resistance poles which are connected in the circumferential direction, the straight axis central line of the magnetic resistance pole and the central line of the permanent magnet pole have a pole distance.
4. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: the magnetic resistance is one or a combination of a magnetic barrier and a salient pole.
5. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: when the magnetic resistance is the magnetic barrier, the magnetic barrier is arranged on the quadrature-axis magnetic circuit, so that the magnetic resistance of the quadrature-axis magnetic circuit can be increased;
when the magnetic resistance is salient pole, the straight axis is the central line of the salient pole;
when the magnetic resistance is the combination of the magnetic barrier and the salient pole, the magnetic barrier is arranged on the quadrature axis magnetic circuit, and the direct axis is the central line of the salient pole.
6. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 5, wherein: when the magnetic resistance poles are magnetic barriers, the magnetic barriers in each magnetic resistance pole are symmetrically distributed.
7. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: the magnetic barrier is also arranged in the quadrature-axis magnetic circuit of the permanent magnet poles, so that the direct-axis magnetic circuit reluctance of the permanent magnet poles is also smaller than the quadrature-axis magnetic circuit reluctance of the permanent magnet poles, and the anti-salient pole characteristic of the alternating pole type permanent magnet auxiliary synchronous reluctance motor is further enhanced.
8. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: the permanent magnet pole has an offset angle relative to the reluctance pole, and the offset angle is smaller than or equal to 1/4 pole pitch, so that the current angle of the maximum torque obtained by the permanent magnet torque approaches the current angle of the maximum torque obtained by the reluctance torque, and the utilization rate of the permanent magnet torque and the reluctance torque is improved.
9. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 8, wherein: the offset gap of the permanent magnet pole relative to the magnetic resistance pole is filled with magnetic barrier or non-magnetic conductive material.
10. The wide-area operating alternating pole permanent magnet assisted synchronous reluctance machine of claim 1, wherein: an alternating current excitation winding is wound in a stator slot of the stator core, and the number of pole pairs of the alternating current excitation winding is also equal to the number of pole pairs p of the rotor; the armature winding is connected with a direct current load through a controllable rectifier; the alternating current excitation winding is connected with a direct current power supply through an inverter; by controlling the controllable rectifier, the quadrature axis current and the direct axis current in the armature winding can be adjusted, so that voltage regulation is realized; the air gap magnetic field, the armature winding flux linkage and the load voltage can be adjusted by adjusting the size and the direction of the direct-axis current in the alternating-current excitation winding; the voltage regulation characteristic is further improved by cooperatively controlling the alternating current exciting winding current and the armature winding end controllable rectifier.
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PCT/CN2022/073898 WO2023284283A1 (en) 2021-07-12 2022-01-26 Consequent-pole-type permanent magnet auxiliary synchronous reluctance electric motor operating in wide area

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Cited By (2)

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