Rotor assembly and alternating pole motor

Abstract

The invention provides a rotor assembly and an alternating pole motor. The rotor assembly includes a rotor core (1), wherein the rotor core (1) includes permanent magnetic poles and alternating polesalternately arranged in the circumferential direction, the permanent magnet poles include mounting grooves (2), permanent magnets (3) are mounted in the mounting grooves (2), polarities of the permanent magnets (3) facing the outer circumference of the rotor core (1) are of the same polarity, second air grooves (5) are respectively disposed at both ends of the mounting grooves (2), first air grooves (4) are disposed on two sides of magnetic pole center lines, the first air grooves (4) are located on a side between the second air grooves (5) and the magnetic pole center lines adjacent to the second air grooves (5), an acute angular tip is formed between a radial outer sidewall of the first air grooves (4) and a first groove wall adjacent to the magnetic pole center lines, and the acute angular tip is gathered toward the magnetic pole center lines. The rotor assembly is advantaged in that the electromagnetic torque drop caused by the excessive magnetic flux area of the permanent magnetscan be effectively suppressed, and motor performance is improved.

Description

technical field [0001] The present application relates to the technical field of motors, in particular to a rotor assembly and an alternating pole motor. Background technique [0002] The number of permanent magnets used by the alternating pole permanent magnet synchronous motor is only half of that of the traditional permanent magnet synchronous motor. Therefore, it can fully utilize the permanent magnets, which can significantly reduce the amount of permanent magnets used, thereby reducing the cost of the motor. [0003] However, its special magnetic circuit structure also brings many problems, including the decrease of output torque caused by the reduction in the use of permanent magnets, and the problem of increased torque fluctuation caused by the asymmetry of adjacent magnetic pole structures, which limits the further promotion of alternating pole motors. application. [0004] In the general motor design process, the traditional concept is that the fewer air slots exi...

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Problems solved by technology

When the magnetic flux area of ​​the permanent magnet is designed too large, the magnetic force line will...

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