CN113300511A - Permanent magnet motor - Google Patents

Permanent magnet motor Download PDF

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Publication number
CN113300511A
CN113300511A CN202010113784.4A CN202010113784A CN113300511A CN 113300511 A CN113300511 A CN 113300511A CN 202010113784 A CN202010113784 A CN 202010113784A CN 113300511 A CN113300511 A CN 113300511A
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CN
China
Prior art keywords
magnets
magnet
thickness
distance
width
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Pending
Application number
CN202010113784.4A
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Chinese (zh)
Inventor
吴建德
林桓槶
利朝凯
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Shihlin Electric and Engineering Corp
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Shihlin Electric and Engineering Corp
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Application filed by Shihlin Electric and Engineering Corp filed Critical Shihlin Electric and Engineering Corp
Priority to CN202010113784.4A priority Critical patent/CN113300511A/en
Publication of CN113300511A publication Critical patent/CN113300511A/en
Pending legal-status Critical Current

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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
    • H02K1/22—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention provides a permanent magnet motor, comprising a stator and a rotor, wherein the rotor is arranged in the stator and can rotate relative to the stator; the body is embedded with a plurality of first magnets, a plurality of second magnets and a plurality of third magnets which are arranged on the body in a radial shape, the second magnets and the third magnets are symmetrically arranged at two sides of the first magnets, and the first magnets are positioned between the outer peripheral surface of the body and the second magnets and the third magnets.

Description

Permanent magnet motor
Technical Field
The present invention relates to a motor, and more particularly, to a permanent magnet motor.
Background
The Interior Permanent magnet Motor (inner Permanent magnet Motor) has many advantages such as high power density, high efficiency, etc. because the salient pole effect (saliency) of its rotor makes it possible to obtain the Reluctance Torque (Reluctance Torque) in addition to the Electromagnetic Torque (Electromagnetic Torque) of the Motor itself. Therefore, the Motor has a wider operation range in a high rotation speed range than a common Surface magnet Motor (Surface magnet Motor), and is widely used in various fields. One of the main factors affecting the output characteristics of the interior permanent magnet motor is the design of the interior permanent magnet motor rotor.
The ratio of the Direct axis (Direct axis) inductance to the Quadrature axis (Quadrature axis) inductance of the rotor is a salient pole ratio (salience ratio), and when the salient pole ratio is larger, larger reluctance torque can be obtained. When the size of the mechanism in the interior permanent magnet motor is not well designed, the fluctuation of the output Torque is caused, and a large Torque Ripple (Torque Ripple) is generated, which causes serious vibration and noise. Therefore, how to improve the structural design of the built-in permanent magnet motor, and reduce the fluctuation of the torque in the process of increasing the output torque, so as to effectively suppress the vibration and noise, and to smoothly and stably output the torque is the subject of intensive research.
Disclosure of Invention
In view of the above, the present inventors have conducted active research, and after many years of experience in research and development of related products, and through continuous experiments and improvements, the present invention was finally developed.
In view of the problems of the prior art, the technical solution provided by the present invention includes:
a permanent magnet motor, comprising:
the rotor is arranged in the stator and can rotate relative to the stator, wherein the rotor comprises a body, an outer peripheral surface is formed on the outer side of the body, and an air gap is formed between the outer peripheral surface and the stator; and
the body is embedded with a plurality of first magnets, a plurality of second magnets and a plurality of third magnets, the plurality of first magnets, the plurality of second magnets and the plurality of third magnets are arranged on the body in a radial shape, the second magnets and the third magnets are symmetrically arranged on two sides of the first magnets, and the first magnets are positioned between the outer peripheral surface of the body and the second magnets and the third magnets.
The permanent magnet motor, wherein: the air gap is not a fixed size, and has a maximum air gap and a minimum air gap, and the maximum air gap is 2-6 times of the minimum air gap.
The permanent magnet motor, wherein: an included angle is formed between the second magnet and the third magnet, and the included angle is 100-120 degrees.
The permanent magnet motor, wherein: the first magnet has a first thickness in the radial direction of the rotor, the second magnet has a second thickness in the radial direction of the rotor, the third magnet has a third thickness in the radial direction of the rotor, and the second thickness and the third thickness are both greater than or equal to the first thickness.
The permanent magnet motor, wherein: the first magnet has a first width in the vertical direction of the first thickness, the second magnet has a second width in the vertical direction of the second thickness, the third magnet has a third width in the vertical direction of the third thickness, and both the second width and the third width are greater than or equal to the first width.
The permanent magnet motor, wherein: a first distance is formed between the outer peripheral surface of the body and the first magnet, a second distance is formed between the first magnet and the second magnet, and a third distance is formed between the second magnet and the third magnet, and the third distance is smaller than the first thickness.
A permanent magnet motor, comprising:
the rotor is arranged in the stator and can rotate relative to the stator, wherein the rotor comprises a body, an outer peripheral surface is formed on the outer side of the body, and an air gap is formed between the outer peripheral surface and the stator; and
a plurality of first magnets, a plurality of second magnets and a plurality of third magnets are embedded on the body, the plurality of first magnets, the plurality of second magnets and the plurality of third magnets are arranged on the body in a radial shape, the second magnets and the third magnets are symmetrically arranged on two sides of the first magnets, and the first magnets are positioned between the outer peripheral surface of the body and the second magnets and the third magnets;
wherein, a first distance is formed between the outer peripheral surface of the body and the first magnet, and the first distance is 3-4 times of the air gap; a second distance is formed between the first magnet and the second magnet and between the first magnet and the third magnet, the first magnet has a first thickness in the radial direction of the rotor, and the second distance is 2.4-2.6 times of the first thickness.
The permanent magnet motor, wherein: the second magnet has a second thickness in the radial direction of the rotor, the third magnet has a third thickness in the radial direction of the rotor, and both the second thickness and the third thickness are greater than or equal to the first thickness.
The permanent magnet motor, wherein: the first magnet has a first width in the vertical direction of the first thickness, the second magnet has a second width in the vertical direction of the second thickness, the third magnet has a third width in the vertical direction of the third thickness, and both the second width and the third width are greater than or equal to the first width.
The permanent magnet motor, wherein: a third distance is arranged between the second magnet and the third magnet, and the third distance is smaller than the first thickness.
In summary, the present invention can reduce the torque ripple, smooth the torque, and improve the output torque, thereby improving the performance and stability of the permanent magnet motor.
In order to make the objects, features and advantages of the present invention comprehensible to those skilled in the art, a preferred embodiment accompanied with figures is described in detail below.
Drawings
Fig. 1 is a schematic structural diagram of a permanent magnet motor according to the present invention.
Fig. 2 is an enlarged view of a part of the permanent magnet motor according to the present invention.
Fig. 3 is a schematic diagram of torque ripples of the permanent magnet motor at different ratios of the first distance to the second distance when the first distance is 3-8 times of the air gap.
FIG. 4 is a schematic diagram of output torque of the permanent magnet motor of the present invention at different ratios of the first distance to the second distance when the first distance is 3-8 times of the air gap.
Description of reference numerals: a stator 10; a rotor 20; a body 21; an outer peripheral surface 211; a first magnet 30; a second magnet 31; a third magnet 32; an air gap; an included angle Theta; a first thickness T1; a second thickness T2; a third thickness T3; a first width W1; a second width W2; a third width W3; the first spacing D1; a second pitch D2; a third distance D3.
Detailed Description
Referring to fig. 1 to 2, fig. 1 is a schematic structural diagram of a permanent magnet motor according to the present invention, and fig. 2 is an enlarged schematic partial structural diagram of the permanent magnet motor according to the present invention. The invention relates to a permanent magnet motor, comprising a stator 10 and a rotor 20, wherein the rotor 20 is arranged in the stator 10, and the rotor 20 can rotate relative to the stator 10, wherein the rotor 20 comprises a body 21, an outer peripheral surface 211 is formed on the outer side of the body 21, and an air gap is formed between the outer peripheral surface 211 and the stator 10.
The main body 21 is embedded with a plurality of first magnets 30, a plurality of second magnets 31 and a plurality of third magnets 32, and is radially arranged on the main body 21, the second magnets 31 and the third magnets 32 are symmetrically arranged on two sides of the first magnets 30, and the first magnets 30 are located between the outer peripheral surface 211 of the main body 21 and the second magnets 31 and the third magnets 32.
According to an embodiment of the present invention, the air gap is not a fixed size, and has a maximum air gap and a minimum air gap, and the maximum air gap is 2-6 times the minimum air gap.
According to an embodiment of the present invention, an included angle Theta is formed between the second magnet 31 and the third magnet 32, and the included angle Theta is 100 to 120 degrees.
Continuing above, in the preferred embodiment, the included angle Theta is 105 degrees.
According to the embodiment of the present invention, the first magnet 30 has a first thickness T1 in the radial direction of the rotor 20, the second magnet 31 has a second thickness T2 in the radial direction of the rotor 20, the third magnet 32 has a third thickness T3 in the radial direction of the rotor 20, and both the second thickness T2 and the third thickness T3 are greater than or equal to the first thickness T1.
In the preferred embodiment, the diameter of the body 21 of the rotor 20 is 95mm, the first thickness T1 is 3.5mm, the second thickness T2 is 3.5mm, the third thickness T3 is 3.5mm, and the second thickness T2 and the third thickness T3 may be greater than or equal to the first thickness T1.
According to the embodiment of the present invention, the first magnet 30 has a first width W1 in the vertical direction of the first thickness T1, the second magnet 31 has a second width W2 in the vertical direction of the second thickness T2, the third magnet 32 has a third width W3 in the vertical direction of the third thickness T3, and both the second width W2 and the third width W3 are greater than or equal to the first width W1.
In the following description, in a preferred embodiment, the first width W1 is 14mm, the second width W2 is 14mm, the third width W3 is 14mm, and the second width W2 and the third width W3 may be greater than or equal to the first width W1.
According to the embodiment of the present invention, a first distance D1 is provided between the outer peripheral surface 211 of the body 21 and the first magnet 30, a second distance D2 is provided between the first magnet 30 and the second magnet 31, and between the third magnet 32 and the second magnet 31, a third distance D3 is provided between the third magnet 32 and the second magnet 31, and the third distance D3 is smaller than the first thickness T1.
Fig. 3 is a schematic diagram of torque ripples of the permanent magnet motor at different ratios of the first distance to the second distance when the first distance is 3-8 times of the air gap. In order to analyze the ratio of the first distance D1 to the air gap (D1/gap) and the ratio of the second distance D2 to the first thickness T1 (D2/T1), the influence of the first distance D1 to the second distance D2 is used as a variable number in the simulation analysis to observe the influence of the first distance D1 to the output performance of the permanent magnet motor on the torque ripple of the permanent magnet motor. After simulation analysis, it is found that when the ratio of the first distance D1 to the air gap is greater than 4 (i.e. D1/gap is greater than 5), the permanent magnet motor generates a large torque ripple, and in the area a of fig. 3, the torque ripple is the smallest, and the torque ripple is less than 3%. From the foregoing analysis results, it can be known that when the first distance D1 is 3-4 times the air gap, and the second distance D2 is 2.4-2.6 times the first thickness T1, the torque ripple of the permanent magnet motor can be reduced.
FIG. 4 is a schematic diagram of output torque of the permanent magnet motor of the present invention at different ratios of the first distance to the second distance when the first distance is 3-8 times of the air gap. Continuing with the analysis result of fig. 3, in the region B of fig. 4, the output torque can be increased by 3 to 5% compared to the other output torques. Therefore, it can be known that when the first distance D1 is 3 to 4 times the air gap and the second distance D2 is 2.4 to 2.6 times the first thickness T1, the output torque of the permanent magnet motor can be increased.
In summary, when the first distance D1 is 3 to 4 times the air gap and the second distance D2 is 2.4 to 2.6 times the first thickness T1, the torque ripple can be reduced, the torque can be smoothed, and the output torque can be increased, thereby improving the performance and stability of the permanent magnet motor.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A permanent magnet motor, comprising:
the rotor is arranged in the stator and can rotate relative to the stator, wherein the rotor comprises a body, an outer peripheral surface is formed on the outer side of the body, and an air gap is formed between the outer peripheral surface and the stator; and
the body is embedded with a plurality of first magnets, a plurality of second magnets and a plurality of third magnets, the plurality of first magnets, the plurality of second magnets and the plurality of third magnets are arranged on the body in a radial shape, the second magnets and the third magnets are symmetrically arranged on two sides of the first magnets, and the first magnets are positioned between the outer peripheral surface of the body and the second magnets and the third magnets.
2. The permanent magnet motor of claim 1, wherein: the air gap is not a fixed size, and has a maximum air gap and a minimum air gap, and the maximum air gap is 2-6 times of the minimum air gap.
3. The permanent magnet motor of claim 1, wherein: an included angle is formed between the second magnet and the third magnet, and the included angle is 100-120 degrees.
4. The permanent magnet motor of claim 1, wherein: the first magnet has a first thickness in the radial direction of the rotor, the second magnet has a second thickness in the radial direction of the rotor, the third magnet has a third thickness in the radial direction of the rotor, and the second thickness and the third thickness are both greater than or equal to the first thickness.
5. The permanent magnet motor of claim 1, wherein: the first magnet has a first width in the vertical direction of the first thickness, the second magnet has a second width in the vertical direction of the second thickness, the third magnet has a third width in the vertical direction of the third thickness, and both the second width and the third width are greater than or equal to the first width.
6. The permanent magnet motor of claim 1, wherein: a first distance is formed between the outer peripheral surface of the body and the first magnet, a second distance is formed between the first magnet and the second magnet, and a third distance is formed between the second magnet and the third magnet, and the third distance is smaller than the first thickness.
7. A permanent magnet motor, comprising:
the rotor is arranged in the stator and can rotate relative to the stator, wherein the rotor comprises a body, an outer peripheral surface is formed on the outer side of the body, and an air gap is formed between the outer peripheral surface and the stator; and
a plurality of first magnets, a plurality of second magnets and a plurality of third magnets are embedded on the body, the plurality of first magnets, the plurality of second magnets and the plurality of third magnets are arranged on the body in a radial shape, the second magnets and the third magnets are symmetrically arranged on two sides of the first magnets, and the first magnets are positioned between the outer peripheral surface of the body and the second magnets and the third magnets;
wherein, a first distance is formed between the outer peripheral surface of the body and the first magnet, and the first distance is 3-4 times of the air gap; a second distance is formed between the first magnet and the second magnet and between the first magnet and the third magnet, the first magnet has a first thickness in the radial direction of the rotor, and the second distance is 2.4-2.6 times of the first thickness.
8. The permanent magnet motor of claim 7, wherein: the second magnet has a second thickness in the radial direction of the rotor, the third magnet has a third thickness in the radial direction of the rotor, and both the second thickness and the third thickness are greater than or equal to the first thickness.
9. The permanent magnet motor of claim 7, wherein: the first magnet has a first width in the vertical direction of the first thickness, the second magnet has a second width in the vertical direction of the second thickness, the third magnet has a third width in the vertical direction of the third thickness, and both the second width and the third width are greater than or equal to the first width.
10. The permanent magnet motor of claim 7, wherein: a third distance is arranged between the second magnet and the third magnet, and the third distance is smaller than the first thickness.
CN202010113784.4A 2020-02-24 2020-02-24 Permanent magnet motor Pending CN113300511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010113784.4A CN113300511A (en) 2020-02-24 2020-02-24 Permanent magnet motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010113784.4A CN113300511A (en) 2020-02-24 2020-02-24 Permanent magnet motor

Publications (1)

Publication Number Publication Date
CN113300511A true CN113300511A (en) 2021-08-24

Family

ID=77318558

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010113784.4A Pending CN113300511A (en) 2020-02-24 2020-02-24 Permanent magnet motor

Country Status (1)

Country Link
CN (1) CN113300511A (en)

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