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Starting method of senseless permanent magnet synchronous motor

A magnetic synchronization and sensing technology, applied in the direction of synchronous generator control, generator control, motor generator control, etc., can solve the problems such as the unreliable start of the fan, the high energy consumption during the start-up process, and the longer start-up time. Fast closed-loop vector control, reduced start-up time, cost and size reduction

Active Publication Date: 2018-08-17
苏州半唐电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With the in-depth research and application of the applicant, it was discovered that when the forward rotation speed of the permanent magnet synchronous motor is high under the condition of downwind, if the technical solution of 201710291097. Controlled start-up, not only causes greater loss, but also leads to longer start-up time
In addition, in some practical applications, when the motor controller is powered off, but because the speed inertia motor has not completely stopped, the controller restarts after power supply is restored, and the motor will also start in a situation similar to that described above.
In the case of headwind, the permanent magnet synchronous motor will reverse at a high speed, and the reverse speed is proportional to the wind speed. For the sensorless controller, measures must be taken to suppress the reverse of the motor (such as 201710291097.X The motor winding short-circuit brake mode), it is difficult to generate enough starting torque in the open-loop start-up phase to pull the fan back to the forward rotation and pull it to synchronization, which leads to the fact that the fan cannot start reliably under headwind conditions
It can be seen from this that although the technical solution of the prior application 201710291097. The startup process consumes a lot of energy and takes a long time to start

Method used

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  • Starting method of senseless permanent magnet synchronous motor
  • Starting method of senseless permanent magnet synchronous motor
  • Starting method of senseless permanent magnet synchronous motor

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Embodiment Construction

[0043] The embodiment of the present invention discloses a method for starting a sensorless permanent magnet synchronous motor. The sensorless permanent magnet synchronous motor is connected to a drive controller. The starting method includes the following steps: S10). The sampling module of the drive controller detects the induced current of the motor, and judges the rotation state of the motor based on the induced current of the motor; S20), determine whether the induced current of the motor is less than the predetermined value of the induced current, if yes, go to step S30), if not, go to step S40); S30), open-loop start control, switch to closed-loop vector control after the motor rotor is pulled into synchronization and reach the predetermined target speed; S40), determine whether the motor is in the forward or reverse state, if it is in the forward state, enter the step to enter Step S50), if not, go to step S60); S50), forward rotation closed-loop vector start control; S6...

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Abstract

The invention discloses a starting method of a senseless permanent magnet synchronous motor, comprising the following steps: S10), after short-circuiting a motor winding, detecting a motor induced current by driving a sampling module of a controller; S20), determining whether the motor induced current is less than a predetermined value of induced current, if so, proceeding to step S30), or if not,proceeding to step S40); S30), performing open-loop start control; S40), determining whether the motor is in a forward or reverse rotation state, if in the forward rotation state, proceeding to stepS50), if not, proceeding to step S60); S50), performing forward rotation closed-loop vector start control; and S60), performing reverse rotation closed-loop vector start control. The starting method ensures the fast and low-current high-efficiency start when the permanent magnet synchronous motor is stationary or tends to be stationary, realizes fast closed-loop vector control under strong downwind or upwind conditions, reduces energy consumption, shortens start time, and makes motor start smooth.

Description

Technical field [0001] The invention belongs to the field of motor control, and specifically relates to a startup method of a sensorless permanent magnet synchronous motor. The invention is particularly suitable for use in various fan systems. Background technique [0002] Permanent magnet synchronous motor sensorless control technology has the advantages of simple implementation, low cost and high reliability, so it is widely used in various fan systems. Since the back EMF of permanent magnet synchronous motors is very small at zero speed or low speed, it is difficult to accurately obtain the position angle of the motor rotor. Therefore, the existing permanent magnet synchronous motors without sensor control usually adopt open-loop start control when starting, and wait for the motor rotor After pulling into synchronization and reaching a certain speed (a more accurate rotor position angle can be obtained by estimation), then switch to closed-loop FOC control (ie, vector control)...

Claims

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Application Information

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IPC IPC(8): H02P6/21H02P21/34H02P101/15H02P103/20
CPCH02P6/21H02P6/22H02P21/28H02P21/34H02P25/024H02P27/08H02P2101/15H02P2103/20
Inventor 符一凡何志明
Owner 苏州半唐电子有限公司
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