Hybrid permanent magnet rotor self-leakage magnetic type variable magnetic flux memory motor

Abstract

The invention relates to a hybrid permanent magnet rotor self-magnetic leakage type variable magnetic flux memory motor. High-coercivity permanent magnets and low-coercivity permanent magnets are distributed on the rotor. The low-coercivity permanent magnets are arranged in a linear manner in the circumferential direction. The high-coercivity permanent magnets are distributed in the radial direction and located at the two ends of the low-coercivity permanent magnets. Magnetic bridges between the end parts of the radial high-coercivity permanent magnets and the circumferential permanent magnets provide paths for magnetic leakage. When the permanent magnet motor operates under a rated load in a magnetic increasing state, magnetic lines of force of the high-coercive-force permanent magnets are influenced by an armature magnetic field and pass through the circumferential low-coercive-force permanent magnets and the circumferential high-coercive-force permanent magnets, flux leakage hardly exists at a magnetic bridge, and high-torque output can be achieved; and during rated load operation in a demagnetizing state, the low-coercive-force permanent magnets are short-circuited by the circumferential high-coercive-force permanent magnets, the influence of an armature magnetic field on the radial high-coercive-force permanent magnets is small, self-flux leakage occurs at a magnetic bridge, and the motor can realize high-speed operation in the state. Therefore, the motor has high torque density and wide speed expansion ratio at the same time.

Description

technical field [0001] The invention relates to a hybrid permanent magnet rotor self-leakage magnetic flux memory variable flux memory motor, which belongs to the technical field of motors. Background technique [0002] With the development of rare earth permanent magnet materials, permanent magnet motors based on NdFeB permanent magnets are widely used in various fields of the national economy due to their remarkable characteristics of high efficiency, high power density, high reliability, and various structural designs. The application in is more and more extensive. However, the relatively constant magnetic field is difficult to adjust, and the motor has poor field-weakening speed regulation ability. Traditional permanent magnet motors generally achieve field weakening by applying a negative direct-axis current component, which increases the risk of irreversible demagnetization of the permanent magnet, and the field weakening range is limited by the high reluctance of the...

AI Technical Summary

Problems solved by technology

[0004] However, due to the different working modes (magnetization or demagnetization) of ordinary hybrid permanent magnet memory motors, in actual design, there is often a balance between the amount of high-coercivity permanent magnets and low-coercivity permanent magnets, and high torque. Trade-off between density and wide speed range

That is to say, high torque density and wide range of speed and magnetic adjustment often cannot be achieved at the same time, which affects the efficient operation of the motor in the whole area

Images