A double-stator rotating electrical machine

Abstract

The invention discloses a double-stator rotating electrical machine, which comprises a rotating shaft arranged along the rotating axis of the rotating electrical machine, an inner stator iron core, an outer stator iron core and a permanent magnet rotor located between the inner and outer stator iron cores. Among them, the permanent magnet rotor is composed of permanent magnet steel and non-magnetic parts; there is an inner magnetic field modulation ring between the permanent magnet rotor and the inner stator core, an outer magnetic field modulation ring between the permanent magnet rotor and the outer stator core, and an inner magnetic field modulation ring. Both the outer and outer magnetic field modulation rings are composed of a magnetically conductive part and a magnetically non-conductive part; the inner magnetic field modulation ring, the permanent magnet rotor and the outer magnetic field modulation ring can rotate relatively. The invention overcomes the problem of difficult adjustment of the magnetic field of traditional permanent magnet motors by adjusting the relative positions of the inner and outer magnetic field modulation rings and the permanent magnet rotor, and not only meets the requirements of low speed and high torque, but also expands the operating range of the motor at high speed. Improved power output characteristics over the full speed range.

Description

technical field [0001] The invention relates to the technical field of rotating electrical machines, in particular to a double-stator rotating electrical machine. Background technique [0002] With the development of motor technology and permanent magnet materials, rotating permanent magnet motors have been widely used in electric vehicle drive systems due to their advantages of high efficiency, high power density, and high power factor. The driving motor of new energy vehicles generally needs to run at variable speeds. At low speeds, it needs low-speed high-torque output; at high speeds, it needs to maintain constant power. Low-speed high-torque can meet the start-up of the whole vehicle, such as acceleration and climbing. The high-speed constant power can meet the maximum speed requirement of the whole vehicle, as well as overtaking at high speed. [0003] However, traditional permanent magnet motors (surface-mounted rotors or built-in rotors) mostly have a single-stator...

AI Technical Summary

Problems solved by technology

However, on the one hand, the field weakening is still not enough to support the large speed range required by electric vehicles, and the existence of the direct axis component of the stator current greatly increases the copper loss of the stator winding, reducing the efficiency of the permanent magnet motor; In the process of magnetic speed expansion, it is inevitable that the permanent magnet steel will be more or less demagnetized, which reduces the reliability of the permanent magnet motor

Images