Hybrid stepping motor of installing permanent magnet on stator

Abstract

The present invention provides a hybrid stepping motor comprising a stator and a rotor. The stator comprises a chassis, a stator iron core, an armature winding, a permanent magnet and an end cover, and the rotor mainly comprises a rotor iron core and a rotating shaft. The permanent magnet is arranged at a notch at the periphery of the stator iron core, an outer circle of the permanent magnet is located at the outer circle of the stator iron core, and an inner circle is located at the groove bottom of the stator iron core. By the circumferential magnetizing, a main magnetic field in the motor is generated, and the number of the magnetic poles decides the pole number of the motor. The armature winding is arranged on the tooth poles of the stator, the windings on the radial relative tooth poles are connected in series or parallel as one phase, and the currents in the windings adopt the unipolar control. The rotor does not have the winding and the permanent magnet, the surfaces of the stator iron core and the rotor iron core facing an air gap are equipped with the small teeth of which the tooth separation distances are same. The hybrid stepping motor of the present invention enables the processing and assembly technologies of the motor and the permanent magnet to be simplified and the cost to be reduced, is reliable to operate and convenient to maintain, is high in precision and large in power density and torque density, and facilitates the development of the industries, such as the precise machine tool processing, the office automation, etc.

Description

technical field [0001] The invention relates to the field of stepping motors, in particular to a structure of a hybrid stepping motor in which a permanent magnet is installed on a stator, which is applied to the fields of computer peripheral equipment, numerical control machine tools, remote control devices and the like. Background technique [0002] There are three types of stepper motors: reactive, permanent magnet and hybrid. Reactive stepping motors have no permanent magnets, and there are small teeth on the surface of the stator and rotor cores. They have the advantages of simple structure, easy manufacturing, and high precision, but have poor efficiency, high power consumption, low torque density and low power density; permanent magnet stepping motors There are permanent magnets on the surface of the rotor, which have the advantages of small control power, high efficiency, and positioning torque when power is off, but the step angle is large, and the frequency of start...

AI Technical Summary

Problems solved by technology

[0006] Patents CN201510039131.5 and CN 201520053883.2 include two inner and outer stators and a cup-shaped rotor. The columnar permanent magnet is embedded in the groove of the inner stator core. The permanent magnet is not convenient for cooling and heat dissipation. The motor winding needs to be driven by bipolar current, and the current in the winding The direction alternates periodically, the structure and drive of the motor are complex, and there are problems in processing and manufacturing; the permanent magnet of CN201020102645.3 is installed in the slot of the stator winding, and there is serious magnetic flux leakage between two adjacent tooth poles. There is the problem that the armature reaction can easily cause the leakage and demagnetization of the permanent magnet, the utilization rate of the permanent magnet is not high, and it is difficult to process the stator core, install the permanent magnet and maintain it later

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