Electric motor controller and control method

Abstract

The invention discloses a motor controller and a control method, which includes a control power supply connected to each module, a single-chip, a relay output module, a switching value input module, a watchdog module, and a keyboard input circuit. The invention is characterized in that the single-chip is respectively connected with a voltage mutual inductor and a current mutual inductor through a voltage filtering amplification module and a current filtering amplification module; the single-chip is respectively connected with a LCD display and a bus drive module through a data bus and a gating module; and the single-chip is also connected with a central control room computer through a communicating interface module. The real time measurement is executed to the voltage and current of the motor loop through the current mutual inductor and a circuit line voltage, and accurate and quick protection is carried out the motor defects such as over loading, locked-rotor, open-phase, light loading, three phase disbalance, earth / electrical leakage, undervoltage, over pressure, etc.; the direct, reversible, star / triangular starting up of the motor are realize with conjunction of exterior circuit, and the communication network carries out centralized monitoring to a plurality of motors distributed at different positions.

Description

technical field [0001] The technical solution to be protected by the present invention relates to a motor controller and a control method. Background technique [0002] At present, in the field of motor control, soft starters, frequency converters, motor controllers and traditional thermal relays coexist. The protection function of the thermal relay is single, the adjustment and setting are inaccurate and there is no communication function; the soft starter focuses on the motor starting process, and is mainly used in the occasions where the load torque of the fan and pump is in the square relationship with the speed; the speed regulation of the frequency converter , control and protection functions are strong, but the price is high. At the same time, the use of soft starters and frequency converters may cause certain pollution to the power grid. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a motor controller ...

AI Technical Summary

Problems solved by technology

The protection function of the thermal relay is single, the adjustment and setting are inaccurate and there is no communication function; the soft starter focuses on the starting process of the motor, and is mainly used in the occasions where the load torque of the fan and pump is in the square relationship with the speed; the speed regulation of the frequency converter , control and protection functions are strong, but the price is high. At the same time, the use of soft starters and frequency converters may cause certain pollution to the power grid

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