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Permanent magnetic synchronous motor in wide weak-magnetic speed-regulating range

A permanent magnet synchronous motor, field weakening speed regulation technology, applied in synchronous motors with static armatures and rotating magnets, synchronous machine parts, magnetic circuit rotating parts and other directions, can solve problems such as increasing inverter capacity , to achieve the effect of improving the speed regulation range, high structural strength and good application prospects

Active Publication Date: 2012-01-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] The purpose of the present invention is to solve the problems existing in the permanent magnet synchronous motor with traditional structure when performing field-weakening speed regulation, and its flux linkage ψ f The larger the direct axis inductance L d The smaller it is, it is necessary to increase the limit current i by a large margin lim To make the motor run in a wider speed range, this will increase the capacity of the inverter. Therefore, the present invention provides a permanent magnet synchronous motor with a wide field-weakening speed range

Method used

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  • Permanent magnetic synchronous motor in wide weak-magnetic speed-regulating range
  • Permanent magnetic synchronous motor in wide weak-magnetic speed-regulating range
  • Permanent magnetic synchronous motor in wide weak-magnetic speed-regulating range

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specific Embodiment approach 1

[0062] Specific implementation mode one: the following combination Figure 9 to Figure 16 Describe this embodiment. The permanent magnet synchronous motor with wide field-weakening speed regulation range in this embodiment includes a stator and a rotor. There is an air gap between the stator and the rotor. The stator is composed of a stator core and a stator winding. The stator winding adopts double-layer short The distance winding is characterized in that the rotor includes a rotor yoke 1, a plurality of permanent magnets 2, a magnetic rotor sheath 3 and a rotor shaft 4, and the magnetic rotor sheath 3 is made of silicon steel sheet, magnetic alloy steel or SMC material.

[0063] The outer surface of the rotor shaft 4 is provided with a rotor yoke 1, and a plurality of permanent magnets 2 are arranged between the outer surface of the rotor yoke 1 and the inner surface of the magnetic rotor sheath 3,

[0064] The number of motor pole pairs is p, and each rotor pole is composed...

specific Embodiment approach 2

[0078] Specific implementation mode two: the following combination Figure 13 with Figure 14 This embodiment is described. The difference between this embodiment and Embodiment 1 is that it also includes a narrow magnetic bridge 5, and a narrow magnetic bridge 5 is provided at the gap between two adjacent rotor poles. The narrow magnetic bridge 5 will The rotor yoke 1 and the magnetic rotor sheath 3 are fixedly connected together, and other structures and connection methods are the same as those in the first embodiment.

[0079] The magnetic rotor sheath 3 adopts an integrated structure with the rotor yoke 1, and the two are connected together by a narrow magnetic bridge 5, which can improve the structural strength of the rotor.

[0080] When the diameter of the rotor of the motor is small, the rotor yoke 1 can be eliminated, and the permanent magnet 2 can be directly pasted on the outer surface of the rotor shaft 4 made of magnetically permeable material, such as Figure 1...

specific Embodiment approach 3

[0081] Specific implementation mode three: the following combination Figure 15 with Figure 16 Describe this embodiment, the difference between this embodiment and Embodiment 1 is that it also includes a rotor magnetic bridge 6, and 2n-1 permanent magnets 2 in each rotor pole are fixedly connected together with the rotor magnetic bridge 6, Other structures and connection modes are the same as those in the first embodiment.

[0082] There is a rotor magnetic bridge 6 between the permanent magnets 2 in each rotor pole, which can not only improve the structural strength of the rotor, but also increase the direct axis inductance and expand the constant power speed regulation range of the motor.

[0083] When the diameter of the rotor of the motor is small, the rotor yoke 1 can be eliminated, and the permanent magnet 2 can be directly pasted on the outer surface of the rotor shaft 4 made of magnetically permeable material, such as Figure 16 shown.

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Abstract

The invention provides a permanent magnetic synchronous motor in a wide weak-magnetic speed-regulating range, belongs to the field of motors, and aims at solving the problem of the permanent magnetic synchronous motor with a traditional structure existing in weak-magnetic speed-regulation, when the flux linkage psi f of the motor is larger, the direct-axial inductance Ld is smaller, so the motor runs in a wider speed range by greatly increasing the limiting current ilim, and the capacity of an inverter is increased. The permanent magnetic synchronous motor comprises a stator and a rotor, wherein the rotor is in a structure that: a plurality of permanent magnets are arranged between the outer circle surface of a rotor yoke and the inner circle surface of a magnetic rotor sheath; the numberof pole pairs of the motor is p; each rotor pole consists of 2n-1 permanent magnets; the outer edge of a radial section of the magnetic rotor sheath is formed by 2p sections of curves; each curve corresponds to one rotor pole, and is a curve spliced by arc pole shoe sections, the two arc pole sections are concentric, circle centers of all the arc pole sections in the 2p sections of curves are positioned on the same circumference, and the circumference is concentric with a rotor shaft.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor with a wide field-weakening speed regulation range and belongs to the field of motors. Background technique [0002] The structure of the traditional permanent magnet synchronous motor is as follows: Figure 25 As shown, the control idea of ​​the traditional permanent magnet synchronous motor comes from the field regulation control of the separately excited DC motor. When the terminal voltage of separately excited DC motor reaches the limit voltage, in order to make the motor run at a higher speed with constant power, the excitation current of the motor should be reduced to ensure the voltage balance. [0003] The voltage equation of a permanent magnet synchronous motor is: [0004] u = ω ( ρ L q i q ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/12H02K1/28H02K1/27H02K21/02
Inventor 寇宝泉白相林李春艳刘奉海
Owner HARBIN INST OF TECH
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