Preheating control method for motor winding

Abstract

The invention relates to the air-conditioning control technique, and discloses a preheating control method for a motor winding, which solves the problems in the prior art of the reduced temperature of a motor winding, the over-current shutdown of an IPM and the large noise of the motor during the preheating process based on existing motor winding preheating schemes. During the preheating control process, the current carrier frequency of a frequency inverter is switched into a higher value and then the primary positioning operation is conducted after the frequency switching process. During the primary positioning process, within the time period T0, a motor is positioned at a designated initial position gamma 0, and a current vector is positioned stationary and maintained for a time period T2. The motor winding is energized for the time period T2, and the positioned current vector is rotated with a designated time period T1 and then is prevented from rotating at a next designated position. During the time period T2, the current vector is maintained stationary and the motor winding is kept energized. Upon the closure of the time period T2, the positioned current vector is rotated during the designated time period T1 to reach the next designated position. The above process is repeated in cycles till the pre-heating process is over. Then the carrier frequency of the frequency inverter is recovered and the preheating process of the motor winding is completed. The above method is applicable to the preheating control of the motor winding of an air conditioner.

Description

technical field [0001] The invention relates to air conditioning control technology, in particular to a motor winding preheating control method. Background technique [0002] In order to prevent the lubricating oil of the outdoor compressor from being frozen in winter and solve the problem that the motor cannot be started, an electric heating belt is often used to heat the compressor to overcome the technical problem that the motor cannot be started. [0003] However, the electric heating belt will increase the product cost, so designers often look for technical solutions that do not increase the cost. [0004] The motor winding preheating method adopted in the patent "Winding Preheating and Starting Method of Permanent Magnet Synchronous Motor CN201210038725.0" can achieve the purpose of heating the motor, but there are the following problems: [0005] 1) Positioning and winding heating are used as a cycle, after positioning and heating by synthetic magnetic field F1 for a...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: to propose a motor winding preheating control method to solve the problems of motor winding temperature reduction, IPM over-current shutdown and high motor noise during preheating existing in the motor winding preheating scheme in the traditional technology

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