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.