Flux increase type built-in U type adjustable magnetic flux motor

Abstract

The invention discloses a flux increase type built-in U type adjustable magnetic flux motor, and belongs to the field of permanent magnet motors. The flux increase type built-in U type adjustable magnetic flux motor aims at solving the problem that when a flux weakening type adjustable magnetic flux motor runs at high loads, uncontrollable demagnetization of an aluminum-nickel-cobalt permanent magnet is prone to happen. The flux increase type built-in U type adjustable magnetic flux motor comprises a stator core, an armature winding, a rotor core, a rotary shaft, p U type permanent magnet grooves, p neodymium iron boron magnetic poles, 2p aluminum-nickel-cobalt magnetic poles and p quadrature axis magnetic barriers, and p is an even number; the p U type permanent magnet grooves and the p quadrature axis magnetic barriers are alternately and evenly arranged on the rotor core in the circumferential direction of the motor, the U type permanent magnet grooves and the quadrature axis magnetic barriers penetrate through the whole rotor core in the axial direction, and openings of the U type permanent magnet grooves face the stator core; each U type permanent magnet groove is formed in the mode that two U type branch rectangular grooves are communicated with one bottom rectangular groove, one neodymium iron boron magnetic pole and two aluminum-nickel-cobalt magnetic poles are arranged in each U type permanent magnet groove, the neodymium iron boron magnetic poles are arranged in the bottom rectangular grooves of the U type permanent magnet grooves, and the aluminum-nickel-cobalt magnetic poles are arranged in the U type branch rectangular grooves in the two sides of the U type permanent magnet grooves.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors. Background technique [0002] In order to overcome the problems that the direct axis component of the armature current increases, the quadrature axis component decreases, the copper loss increases, and the electromagnetic torque of the motor decreases rapidly when the traditional rare earth permanent magnet motor is running at a weak field speed. The adjustable magnetic flux memory motor with coercive force AlNiCo permanent magnet came into being. When the motor is running, the air gap flux density of the permanent magnet motor is adjusted by applying the direct axis charge and demagnetization pulse current, thereby expanding the speed regulation range of the motor. . However, the quadrature-axis reactance Lq of this type of motor is often greater than the direct-axis reactance Ld during design. When the motor is running at high load, it needs a negative direct-axis current component to ge...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of uncontrollable demagnetization of AlNiCo permanent magnets prone to occur in high-load operation of a field-weakening adjustable flux motor, and at the same time reduce the difficulty of accurately adjusting the magnetization of AlNiCo permanent magnets online, and provide a This type uses AlNiCo permanent magnets and NdFeB permanent magnets at the same time, with built-in U-shaped magnetic poles, and the quadrature axis reactance Lq is smaller than the direct axis reactance Ld, that is, the magnetization adjustable flux motor

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