Adjustable-magnetic rotation motor

Abstract

The invention relates to the field of a rotation motor, in particular to an adjustable-magnetic rotation motor. The adjustable-magnetic rotation motor comprises an enclosure, a stator core, a rotor core and a rotation shaft, wherein the stator core is fixed on the enclosure, a stator winding is embedded in the stator core, a plurality of tangential permanent-magnet magnetic steel are arranged in the rotor core, N poles and S poles of the tangential permanent-magnet magnetic steel are alternatively arranged, one end of the rotor core in an axial direction is connected with the rotation shaft, a space is arranged between the other end of the rotor core and the rotation shaft, and a magnetic regulation ring is arranged in the space, can axially rotate and move and is connected with the rotation shaft by a spiral spline. Regulation on effective magnetic flux of a main gap is performed by the magnetic regulation ring, so that the motor has high magnetic regulation capability to further achieve high flux-weakening speed expansion capability; meanwhile, flux weakening of the permanent-magnet motor requiring a large direct-axis demagnetization current is prevented, and high-efficiency and high-power factors of the motor are ensured; and moreover, the permanent-magnet magnetic steel has no demagnetization risk, and the motor reliability is improved.

Description

technical field [0001] The invention relates to the field of rotating electrical machines, in particular to an adjustable magnetic rotating electrical machine. Background technique [0002] Permanent magnet motors have been widely used in electric vehicles due to their high efficiency, high torque density, and high reliability. The output performance has high requirements. At low speed, low-speed and high-torque output is required to meet the start of the vehicle, such as acceleration and climbing; at high speed, it is necessary to maintain constant power to meet the maximum speed of the vehicle. when overtaking. The magnetic field of the permanent magnet motor is difficult to adjust. Although the permanent magnet magnetic field can be adjusted by weakening the magnetic field, the weakening field is still not enough to support the large speed operating range required by the electric vehicle, and due to the existence of the direct axis component of the stator current, The c...

AI Technical Summary

Problems solved by technology

The magnetic field of the permanent magnet motor is difficult to adjust. Although the permanent magnet magnetic field can be adjusted by weakening the magnetic field, the weakening field is still not enough to support the large speed operating range required by the electric vehicle, and due to the existence of the direct axis component of the stator current, The copper loss of the stator winding is greatly increased, which reduces the efficiency of the permanent magnet motor

On the other hand, in the process of field weakening and speed expansion, more or less demagnetization of the permanent magnet steel is inevitable, which reduces the reliability of the permanent magnet motor

It can be seen that the traditional permanent magnet motor is basically difficult to meet the performance requirements of the entire area

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