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Synchronous motor start control method and system

A technology of synchronous motor and start control, which is applied in the direction of speed/torque control of a single motor, and can solve the problems of position sensor speed not being zero and failure to start successfully.

Active Publication Date: 2014-04-23
GUANGDONG WELLING ELECTRIC MACHINE MFG +1
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a start-up control method of a synchronous motor, aiming to solve the problem that the existing synchronous motors without position sensors cannot start successfully because the speed before start-up is not zero

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  • Synchronous motor start control method and system
  • Synchronous motor start control method and system
  • Synchronous motor start control method and system

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] The mathematical model of the synchronous motor on the three-phase static coordinate system is a complex system with multiple variables, nonlinearity and strong coupling. It is difficult to solve the variables in this coordinate system, so it is necessary to realize the control from the static state through the vector transformation control technology. The transformation from the coordinate system to the rotating coordinate system can decouple the excitation component and torque component in the stator current of the motor, so that the permanent magnet synchronous motor can independently cont...

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Abstract

The invention pertains to the technical field of synchronous motor control, and provides a synchronous motor start control method and system. According to the invention, after the synchronous motor is powered on, zero-current closed-loop control is performed on the synchronous motor at first, and the motor rotating speed is acquired at the same time to detect the initial rotating speed of the synchronous motor, and then when the motor rotating speed is greater than a preset rotating speed value (i.e., the initial rotating speed is greater than the preset rotating speed value), zero-current closed-loop control is performed on the synchronous motor continuously, and speed closed-loop control is performed on the synchronous motor according to the magnetic pole position and the rotating speed of the motor rotor so as to make the motor rotating speed smoothly changed to the object rotating speed to successfully complete the start process when the initial speed of the synchronous motor is greater than the preset rotating speed value, and no current abrupt change will occurs, no torque impact will be generated on loads, so the problem that the start process cannot be performed successfully with an existing synchronous motor which is not provided with a position sensor caused by the reason that the rotating speed of the motor before starting is not zero can be solved.

Description

technical field [0001] The invention belongs to the technical field of synchronous motor control, and in particular relates to a method and system for starting and controlling a synchronous motor. Background technique [0002] For existing synchronous motors without position sensors, the starting method is usually to initially position the rotor first, that is, to input a DC current with a preset amplitude to the motor winding within a preset time to position the motor rotor at a certain position ; Then, current dragging is performed on the motor rotor. This process is realized by the simultaneous implementation of current closed-loop control and speed open-loop control. Through, the speed open-loop control is to gradually increase the current frequency according to the preset current frequency increment value to increase the motor speed to the preset target speed; then, switch from the speed open-loop control to the speed closed-loop control (maintain the current closed-loo...

Claims

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Application Information

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IPC IPC(8): H02P6/08
Inventor 刘毅秦向南
Owner GUANGDONG WELLING ELECTRIC MACHINE MFG
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