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A motor automatic identification method and variable frequency motor drive circuit

A frequency conversion motor, automatic identification technology, applied in the direction of AC motor control, emergency protection circuit devices, electrical components, etc., can solve the problem that the frequency conversion motor can only be installed in a specific way, so as to improve the self-adaptive ability and automatic fault identification ability, reduce production cost, the effect of reducing maintenance costs

Active Publication Date: 2016-08-17
HISENSE(SHANDONG)REFRIGERATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing specific frequency conversion motor can only be installed with a specific frequency conversion control board, the present invention provides a motor automatic identification method, which can identify the motor model after the frequency conversion motor is powered on and before it works, and realizes the ability to drive a variety of designated variable frequency motor

Method used

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  • A motor automatic identification method and variable frequency motor drive circuit

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Embodiment 1

[0026] The first embodiment is an automatic motor identification method of this embodiment. A fixed voltage is applied to each phase winding of the variable frequency motor through the variable frequency control board, and then the current of each phase winding is measured to calculate the winding resistance and inductance of the motor. Compare with known motor parameters, identify the motor model, and at the same time identify the lack of phase of the motor terminal, improve the self-adapting ability of the inverter board and the motor and the ability to automatically identify faults.

[0027] It includes the following steps:

[0028] S1. Connect the u, v, w three-phase windings of the variable-frequency motor to the variable-frequency control drive circuit. When the variable-frequency motor is stationary, the variable-frequency control board will individually add time to each phase winding of the connected circuit, respectively, Tu, Tv, Tw DC Voltage Uu, Uv, Uw, detect the phase ...

Embodiment 2

[0031] Second embodiment, this embodiment will combine the principle diagram of the variable frequency motor drive circuit to further describe the automatic motor identification method of this embodiment in detail. The technical solution in this embodiment includes all the technical features in the first embodiment. Necessary repetition, only the features added in the first embodiment are described here, see figure 1 As shown, the variable frequency motor M includes three-phase windings u, v, and w. Each phase winding terminal is connected to an electronic switch circuit one by one and then connected to the voltage output terminal Vcc of the control board. The three switch circuits and the control board are respectively connected Bus voltage detection points A, B, and C are provided for detecting bus voltage U, and phase current detection points D, E, and F are provided between the three-phase winding terminal and the switching circuit connected to it for detecting The phase cu...

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Abstract

The invention discloses an automatic motor identification method and a variable frequency motor driving circuit. The automatic motor identification method comprises the following steps of (1) connecting three phases of windings u, v and w of a variable frequency motor to a driving control circuit, applying short-term voltages Uu, Uv and Uw to each phase of winding connected to the circuit by using a variable frequency control board, detecting phase current Iu, Iv and Iw of each phase of winding, and calculating the winding resistance R and motor inductance L of the motor according to a voltage-current relation formula of the variable frequency motor; and (2) comparing the R and L with rated parameters Re and Lc of a standby motor pre-stored in the variable frequency control board one by one, and controlling to execute a variable frequency motor driving programs which correspond to the rated parameters by using the variable frequency control board if R=Re and L=Lc are matched. Due to the adoption of the automatic motor identification method and the variable frequency motor driving circuit, multiple types of specified motors are driven by using one variable frequency motor driving circuit, and the production, management and after-sales costs of products are reduced.

Description

Technical field [0001] The invention belongs to the technical field of automatic control, and specifically relates to an automatic motor identification method. Background technique [0002] The application range of inverter motors is gradually widening, especially in household appliances that require inverter control such as washing machines, air conditioners, refrigerators, etc. Because products are subject to different models and specific performance requirements, there will be a situation where one electrical appliance will be equipped with multiple inverter motors at the same time Because different motors need to match different driver programs, that is to say, a frequency conversion control board can only drive a specific frequency conversion motor. Therefore, in the actual production process, the manufacturer will assemble its corresponding frequency conversion drive board according to the type of the frequency conversion motor. This will bring unnecessary troubles to manuf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/048H02H7/09H02P27/04
Inventor 文蛟刘玉春刘振华徐强周智博刘大燕
Owner HISENSE(SHANDONG)REFRIGERATOR CO LTD
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