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High-efficiency and high-power-density Halbach array brushless direct-current motor

A high power density, brushed DC motor technology, applied to synchronous motors with stationary armatures and rotating magnets, electric components, electrical components, etc., can solve the problem of large iron losses of permanent magnets and rotor yokes, and harmonic content of magnetic fields To achieve the effect of increasing power density, reducing overall weight and improving efficiency

Active Publication Date: 2018-07-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this structural arrangement of the motor, because the armature magnetic field of the motor rotates in the permanent magnet and the rotor yoke, iron loss is generated in the permanent magnet and the rotor yoke, and the brushless DC motor has a square wave nature of the armature current, so The high harmonic content of the magnetic field in the air gap field results in high iron losses in the permanent magnets and rotor yoke

Method used

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  • High-efficiency and high-power-density Halbach array brushless direct-current motor
  • High-efficiency and high-power-density Halbach array brushless direct-current motor
  • High-efficiency and high-power-density Halbach array brushless direct-current motor

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specific Embodiment 1

[0027] The high-efficiency, high-power-density Halbach array brushless DC motor described in this embodiment includes a stator core, an armature winding, a rotor sheath, two permanent magnet Halbach arrays per pole, a yoke, a yoke bracket and a rotating shaft. In this embodiment, the number of stator slots is 24, the number of pole pairs is 2, and there are two Halbach arrays for each pole. The arc angle of the main magnetic steel is 75.6°, the thickness of the yoke is 5mm, and the thickness of the core pad is 6mm. Figure 4 The yoke support is cast aluminum, the thickness of hole 1 in the block is 3mm, and the arc angle is 45°.

specific Embodiment 2

[0028] The high-efficiency, high-power-density Halbach array brushless DC motor described in this embodiment includes a stator core, an armature winding, a rotor sheath, three permanent magnet Halbach arrays per pole, a yoke, a yoke bracket and a rotating shaft. In this embodiment, the number of stator slots is 12, the number of pole pairs is 2, and there are three Halbach arrays for each pole. The block thickness is 6mm, Figure 4 The yoke support is cast aluminum, the thickness of the hole 1 in the block is 3mm, and the arc angle is 45°.

specific Embodiment 3

[0029] The high-efficiency, high-power-density Halbach array brushless DC motor described in this embodiment includes a stator core, an armature winding, a rotor sheath, three permanent magnet Halbach arrays per pole, a yoke, a yoke bracket and a rotating shaft. In this embodiment, the number of stator slots is 24, the number of pole pairs is 2, and each pole has three Halbach arrays. The arc angle of the main magnet is 70°, the magnetization angle of the auxiliary magnet is 32.4°, the thickness of the yoke is 4mm, and the core pad The block thickness is 7mm, Figure 4 The yoke support is cast aluminum, the thickness of the hole 1 in the block is 3mm, and the arc angle is 45°.

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Abstract

The invention relates to a high-efficiency and high-power-density Halbach array brushless direct-current motor which comprises a stator core, an armature winding, a rotor sheath, a rotor permanent magnet, a magnet yoke, a magnet yoke support and a rotating shaft. The rotor permanent magnet is block Halbach arrays, the Halbach arrays are of a structure that each pole is larger than or equal to twoblocks, and the magnet yoke support is made of non-magnetic materials and drilled. By the aid of a structure of the motor, the power and the power density of the brushless direct-current motor are improved, air-gap flux density is adjusted by the aid of the Halbach arrays, the flux density of the rotor core is reduced, the magnet yoke is made of permeability magnetic materials as little as possible, output power of the motor is ensured, the magnet yoke is matched with the low-density magnet yoke support made of non-magnetic materials, so that rotor loss is reduced, and weight is reduced, and the power and the power density of the motor are increased.

Description

technical field [0001] The invention belongs to a brushless direct current motor and relates to a brushless direct current motor using a Halbach array. The motor rotor has a novel structure and has high efficiency and high power density. Background technique [0002] Brushless DC motors are widely used in aerospace, navigation, medical equipment, industrial production, transportation, new energy and other fields because of their excellent performance such as simple control, high power density, and high efficiency. The brushless DC motor adopts permanent magnet excitation, and the magnetization direction of each magnetic pole is parallel magnetization or radial magnetization, and the motor air gap flux density waveform is close to a square wave. The rotor structure of the motor adopts a surface-mounted structure, and the rotor yoke reduces the magnetic resistance, which is conducive to enhancing the magnetic density of the air gap of the motor. Under this structural arrangem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/16H02K1/27
CPCH02K1/276H02K21/16H02K2213/03
Inventor 罗玲薛利昆谷妍罗兵张勇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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