Spindle synchronous motor with wide speed regulation range for lathe

Abstract

The invention provides a spindle synchronous motor with a wide speed regulation range for a lathe. The spindle synchronous motor comprises a stator core, three-phase windings in stator grooves, a rotor core and permanent magnets which are embedded into the rotor core and are in special structures, wherein the stator core and the rotor core are formed by laminating silicon steel sheets and fixed by rivets; conductors in the stator grooves are the three-phase symmetrical windings; the permanent magnets are in layered and segmented structures; slender and nonuniform-width hollow holes are reserved into a rotor structure to form double-layer magnetic barriers; the hollow holes are symmetrically distributed on the two sides, close to the bottom of a rotating shaft, of each concave permanent magnet, and transversely arranged into quadrature axis magnetic circuits; a chamfered angle close to a stator side is larger; and a chamfered angle close to a rotating shaft side is smaller. According to the spindle synchronous motor, a new method of selecting the number of the stator conductors is provided, the magnetic potential of an armature reaction is improved by a novel rotor structure, the main magnetic flux is reduced, the output characteristic of the motor is optimized, and effects of improving the weak magnetism and increasing the maximum rotating speed are achieved, so that the speed regulation range of the spindle synchronous motor is greatly widened.

Description

technical field [0001] The invention relates to a permanent magnet motor, in particular to a spindle synchronous motor for a lathe which can improve the output performance and weak magnetic performance of the motor and has a wide speed regulation range, and belongs to the technical field of motors. Background technique [0002] Due to its advantages of simple structure, high efficiency and high power factor, permanent magnet synchronous motors have been widely used in the fields of industry, civil and national defense. However, due to its small direct-axis inductance and small armature reaction, the weak magnetic performance is poor and the speed regulation range is narrow, which limits its application in spindle machine tools that require high speed and a wide speed regulation range for the motor. . Spindle motors for lathes require the motor to have a large torque at low speeds. As the speed increases, when running at high speeds, it is necessary to increase the speed by ...

AI Technical Summary

Problems solved by technology

That is, because the spindle motor requires low-speed torque output capability at the same time, that is, a certain no-load permanent magnet flux linkage, it also requires a high-speed and wide speed regulation range, that is, a large direct-axis armature demagnetization response and a relatively small no-load permanent magnet flux linkage. Flux linkage, these requirements are contradictory for permanent magnet motors using permanent magnet excitation, and it is also the insoluble contradiction caused by the difficulty in speed expansion of permanent magnet motors

These limit the application of synchronous motors in spindle machine tools

Images