Micro-size single-phase permanent-magnet synchronous motor

Abstract

The invention relates to a micro-size permanent-magnet single-phase synchronous motor which comprises a stator and a permanent-magnet rotor which are same in pole number, wherein an AC (Alternating Current) power supply supplies electricity to the stator through the switch of a control circuit; an air gap is narrowed along a same peripheral direction under each pole so that the axial lines of the poles of the permanent-magnet rotor deflect an acute angle in a free state by taking the axial line of one closest pole of the stator as a reference; a linear magnetic position sensor is arranged on the peripheral preset position of the permanent-magnet rotor to detect the polarity and the position of the permanent-magnet rotor; the control circuit determines the axial direction of the permanent-magnet flux of various poles of the permanent-magnet rotor through the output of the linear magnetic position sensor by taking the peripheral preset position as the reference; and the control circuit detects the polarity of voltage which is supplied by the AC power supply to the stator to determine the axial directions of main fluxes generated at all the poles and control the half-waves of the AC power supply one by one according to a rotation direction set for the permanent-magnet rotor. The micro-size permanent-magnet single-phase synchronous motor disclosed by the invention can start and operate according to the preset rotation direction and is good in property and simple and reliable in control structure.

Description

technical field [0001] The invention relates to a miniature single-phase permanent magnet synchronous motor, in particular to a miniature single-phase permanent magnet synchronous motor directly driving a small-power centrifugal water pump. In the international patent classification table, the classification can belong to H02P6 / 20. Background technique [0002] Compared with the asynchronous motor, the traditional miniature single-phase permanent magnet synchronous motor that directly drives the small-power centrifugal water pump is obviously energy-saving and material-saving, but its rotation direction is uncertain, which affects the high-efficiency and multi-purpose design of the driven machinery. The existing technology has been for Efforts to improve this deficiency can be found in the Chinese Invention Patent Application Publication CN1275257A and the Chinese Utility Model Patent Specification CN201409107Y. However, the control structures of these designs in the prior a...

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Problems solved by technology

[0002] Compared with the asynchronous motor, the traditional miniature single-phase permanent magnet synchronous motor that directly drives the small-power centrifugal water pump is obviously energy-saving and material-saving, but its rotation direction is uncertain, which affects the high-efficiency and multi-purpose design of the driven machinery. The existing technology has been for Efforts to improve this deficiency can be seen in the Chinese Invention Patent Application Publication CN1275257A and the Chinese Utility Model Patent Specification CN201409107Y

However, the control structure of these designs in the prior art is rather complicated, and the actual use effect is still not good.

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