Starting method and system for air conditioner permanent magnetic synchronization fan motor

Abstract

The invention discloses a starting method and system for an air conditioner permanent magnetic synchronization fan motor. The method comprises: obtaining a DC bus voltage V[DC] through detection; according to Istartup=Istart+K* V[DC], obtaining a starting current Istartup; after the motor operates for a preset time at Istartup, respectively detecting and obtaining Iu, Iv and Iw; according to the Iu, the Iv or the Iw, estimating and obtaining an operation speed Wrest; when it is determined that the Wrest is not smaller than a preset starting speed, controlling the motor to operate through acceleration to a preset speed Wrref; detecting the operation speed, when it is determined that the operation speed is not smaller than the preset speed Wrref, obtaining an Idref and an Iqref by subjecting the difference between the Wrref and the Wrest to a PI operation; and obtaining an operation voltage by respectively subjecting the difference between the Idref and an Idest, and the difference between the Iqref and an Iqest to an PI operation.

Description

technical field [0001] The invention relates to the technical field of air conditioners, and more specifically, to a method and system for starting a permanent magnet synchronous fan motor for air conditioners. Background technique [0002] Most of the existing fan motors for cooling of air-conditioning with full DC frequency conversion adopt DC frequency conversion synchronous motors, including DC brushless motors and permanent magnet synchronous motors. Hot running state. [0003] The fan motor is different from the variable frequency compressor motor. Its main load is the fan blade. The fan blade has the following two characteristics: ①It has a large inertia ②It is easily affected by the outside world, such as the wind. Therefore, when the fan motor is started at certain times, the rotor of the fan motor is rotating, and the position of the rotor is easily detected inaccurately, resulting in failure to start. [0004] In view of the above difficulties, the existing meth...

AI Technical Summary

Problems solved by technology

In this method, there is no need to detect the rotor position, and the startup is simple; however, it cannot be adjusted according to the actual load situation, lacks good dynamic performance, and it is difficult for the fan motor to generate the maximum torque. When a large starting torque is required, it is easy to fail to start

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