CN-120428143-B - Single-phase asynchronous motor main and auxiliary winding identification method

CN120428143BCN 120428143 BCN120428143 BCN 120428143BCN-120428143-B

Abstract

The invention relates to a method for identifying main windings and auxiliary windings of a single-phase asynchronous motor, which connects the main windings and the auxiliary windings of the single-phase asynchronous motor in a V-shaped mode and is connected with an output U, V, W terminal of a frequency converter, the frequency converter inputs direct current detection voltage to the motor windings from a group of bridge arms, three-phase current values are measured and analyzed to determine winding intermediate points and main and auxiliary winding end points, and the frequency converter independently applies test voltage to the motor windings, so that the current winding connection mode of the single-phase motor is identified without the assistance of additional tools such as a universal meter or a bridge.

Inventors

LIAO YONG
LIU ZHONGMING
ZHANG WEN
HE SHENGHU
XU YAO

Assignees

湖南福工动力科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250527

Claims (3)

1. The method for identifying the main winding and the auxiliary winding of the single-phase asynchronous motor is characterized by comprising the following steps of: s1, connecting a main winding and an auxiliary winding of a single-phase asynchronous motor in a V-shaped mode, wherein three terminals after V-shaped connection are respectively connected with a terminal of an output U, V, W of a frequency converter; s2, obtaining three groups of bridge arms of the frequency converter 、、 Three-phase current value of (2) 、、 ; S3, according to the three-phase current value 、、 Judging the middle point of the motor winding, and marking a bridge arm of the frequency converter connected with the middle point of the motor winding as ; The method for judging the middle point of the motor winding comprises the following steps: If it is Judging the three-phase current Corresponding bridge arm The connecting point of the (a) is the middle point of the motor winding; If it is And is also provided with Judging the three-phase current Corresponding bridge arm The connecting point of the (a) is the middle point of the motor winding; If it is And is also provided with Judging the three-phase current Corresponding bridge arm The connecting point of the (a) is the middle point of the motor winding; s4, obtaining three groups of bridge arms of the frequency converter 、、 Three-phase current value of (2) 、、 ; S5, according to the three-phase current value 、、 Judging a main winding end point and an auxiliary winding end point; If it is And is also provided with Judging the three-phase current Corresponding bridge arm Is the main winding end point, three-phase current Corresponding bridge arm The connection point of (2) is a secondary winding end point; If it is And is also provided with 、 Judging the three-phase current Corresponding bridge arm Is the main winding end point, three-phase current Corresponding bridge arm The connection point of (2) is the secondary winding end point.
2. The method for identifying main and auxiliary windings of single-phase asynchronous motor according to claim 1, wherein any one of three groups of bridge arms of the slave frequency converter Input DC detection voltage to single-phase asynchronous motor winding Measuring three-phase current values of three groups of bridge arms of the frequency converter respectively, and connecting the bridge arms The corresponding current is recorded as The other two groups of bridge arms 、 The corresponding currents are respectively recorded as 、。
3. The method for identifying main and auxiliary windings of single-phase asynchronous motor according to claim 1, characterized in that the auxiliary bridge arm Inputting DC detection voltage again to single-phase asynchronous motor Three-phase current values of three groups of bridge arms of the frequency converter are respectively measured, and the bridge arms of the frequency converter are connected with the middle points of motor windings The corresponding current is recorded as The other two groups of bridge arms 、 The corresponding currents are respectively recorded as 、。

Description

Single-phase asynchronous motor main and auxiliary winding identification method Technical Field The invention relates to the technical field of motors, in particular to a method for identifying main windings and auxiliary windings of a single-phase asynchronous motor. Background Due to the characteristics of simple structure and low cost, the single-phase asynchronous motor is widely used in various fields, such as refrigerators and washing machines in household appliances, small ventilators and pumps in various industrial equipment, and the like; At present, most single-phase asynchronous motors adopt a control mode of directly driving a power frequency power supply, and the control mode has obvious limitations that on one hand, the accurate control of the motor speed cannot be realized, so that the motor is difficult to meet a plurality of working scenes with higher requirements on the rotating speed precision in the running process; The winding of the single-phase asynchronous motor is composed of two groups of coils, one group is a main winding (running winding) for providing running torque for the motor, the other group is an auxiliary winding (starting winding) for providing rotating torque for starting the motor, the running performance and the control effect of the single-phase asynchronous motor are greatly dependent on the accurate connection and control of the main winding and the auxiliary winding, however, the problem that the automatic identification of the main winding and the auxiliary winding cannot be realized exists when the existing frequency converter controls the single-phase asynchronous motor, in order to determine the main winding and the auxiliary winding of the motor, the strategy and the judgment are usually carried out by means of tools such as a universal meter or a bridge, and the like, the method is complex in operation, a professional operator is required to have certain experience and skill, and the method is also easily influenced by various factors such as the precision of the tools, the stability of the measuring environment and the like in the actual operation process, so that the measuring result is inaccurate, and the follow-up control and running of the motor are influenced; therefore, the existing single-phase asynchronous motor control technology has obvious defects in winding identification, and the intelligent and efficient development of motor control is severely restricted. Disclosure of Invention In view of the above, the invention provides a method for identifying main windings and auxiliary windings of a single-phase asynchronous motor, which applies test voltage to the windings of the motor through a frequency converter so as to identify the main winding and auxiliary winding modes of the current single-phase asynchronous motor, and determines the main windings and the auxiliary windings without the assistance of tools such as a manually operated universal meter, thereby greatly reducing the use difficulty. In order to achieve the purpose, the invention provides a method for identifying main windings and auxiliary windings of a single-phase asynchronous motor, which comprises the following steps: s1, connecting a main winding and an auxiliary winding of a single-phase asynchronous motor in a V-shaped mode, wherein three terminals after V-shaped connection are respectively connected with a terminal of an output U, V, W of a frequency converter; s2, obtaining three groups of bridge arms of the frequency converter 、、Three-phase current value of (2)、、; S3, according to the three-phase current value、、Judging the middle point of the motor winding, and marking a bridge arm of the frequency converter connected with the middle point of the motor winding as; S4, obtaining three groups of bridge arms of the frequency converter、、Three-phase current value of (2)、、; S5, according to the three-phase current value、、Judging a main winding end point and an auxiliary winding end point; If it is And is also provided withJudging the three-phase currentCorresponding bridge armIs the main winding end point, three-phase currentCorresponding bridge armThe connection point of (2) is a secondary winding end point; If it is And is also provided with、Judging the three-phase currentCorresponding bridge armIs the main winding end point, three-phase currentCorresponding bridge armThe connection point of (2) is the secondary winding end point. Preferably, any one of three groups of bridge arms of the frequency converterInput DC detection voltage to single-phase asynchronous motor windingMeasuring three-phase current values of three groups of bridge arms of the frequency converter respectively, and connecting the bridge armsThe corresponding current is recorded asThe other two groups of bridge arms、The corresponding currents are respectively recorded as、。 Preferably, the step of determining the motor winding intermediate point comprises the steps of: If it is Judging the three-phase curren