Starting circuit and starting method of permanent magnet synchronous motor

Abstract

The invention discloses a starting circuit and a starting method of a permanent magnet synchronous motor. The starting circuit of the permanent magnet synchronous motor comprises an inverter circuit, three current sensors, a motor and a master control panel, wherein the inverter circuit comprises three groups of IGBT modules; the three groups of IGBT modules are electrically connected with the motor through three leads respectively; the three current sensors are respectively located on the three leads; and the master control panel comprises a rotating speed control module, a starting current instruction generation module, a current control module, a rotating speed estimation unit, an integrator unit, a position signal switching unit, an IPARK unit, a CLARK unit, a PARK unit and an SVPWM unit. The starting circuit and the starting method have the characteristics that the starting process can be quickened; the angle difference between a given rotating coordinate system and an actual rotating coordinate system is reduced; and smooth switching from rotating speed open loop starting to double closed-loop sensorless vector control operation of rotating speed current is ensured.

Description

technical field [0001] The present invention generally relates to the technical field of motor control, and specifically refers to a permanent magnet synchronous motor starting circuit and a starting method that can realize sensorless starting and smooth switching. Background technique [0002] Permanent magnet synchronous motors have inherent advantages such as small size, high power density, and fast response. In recent years, with the development of permanent magnet materials, power electronics integration, and high-performance microprocessors, permanent magnet synchronous motor drive systems based on vector control technology It has been widely used in household appliances, CNC machine tools, industrial robots, electric vehicles and other fields. [0003] In recent years, a variety of sensorless rotor position and speed estimation methods have been proposed. In the sensorless industrial application of permanent magnet synchronous motors, the simple and easy back EMF met...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the permanent magnet synchronous motor in the prior art that it is difficult to start with load and the switch between open and closed loops is not smooth under the condition of no sensor, and to provide a sensorless start and smooth switch. Permanent magnet synchronous motor starting circuit and starting method

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