초록 ▼

A method and device for controlling the torque of a permanent magnet (PM), synchronous, alternating-current (AC) motor, wherein the motor is powered by an inverter connected to a direct-current (DC) power source, is proposed. The method includes the steps of communicating a torque command signal fro

A method and device for controlling the torque of a permanent magnet (PM), synchronous, alternating-current (AC) motor, wherein the motor is powered by an inverter connected to a direct-current (DC) power source, is proposed. The method includes the steps of communicating a torque command signal from a user to a microcontroller, sensing the alternating-current phase currents of the motor and communicating electrical signals representing data concerning the phase currents to the microcontroller, sensing the position of the rotor of the motor and communicating electrical signals representing data concerning the position of the rotor to the microcontroller, and utilizing the microcontroller to implement a modulation technique to generate electrical switching signals for creating electrical sinusoidal waveforms. In addition, the method also includes the step of utilizing the microcontroller to implement a vector control technique to generate electrical control signals for adjusting the frequency and magnitude of the sinusoidal waveforms according to the phase current data, the rotor position data, the voltage supplied by the power source, and the torque command signal. In this particular step, generating the control signals includes the step of referring to look-up tables in an electronic memory only when operating the motor in a constant torque mode. Lastly, the method also includes the step of utilizing the microcontroller to communicate the switching signals for creating sinusoidal waveforms to the inverter. In this way, the inverter is able to generate and transmit sinusoidal waveforms, as dictated by the switching signals, to the motor for optimal torque control.

대표청구항 ▼

1. A method for controlling the torque of a permanent magnet synchronous motor wherein said motor is powered by an inverter connected to a direct-current power source, said method comprising the steps of:communicating a torque command signal from a user to a microcontroller; sensing the alternating-

1. A method for controlling the torque of a permanent magnet synchronous motor wherein said motor is powered by an inverter connected to a direct-current power source, said method comprising the steps of:communicating a torque command signal from a user to a microcontroller; sensing the alternating-current phase currents of said motor and communicating electrical signals representing data concerning said phase currents to said microcontroller; sensing the position of the rotor of said motor and communicating electrical signals representing data concerning said position of said rotor to said microcontroller; utilizing said microcontroller to implement a modulation technique to generate electrical switching signals for creating electrical sinusoidal waveforms; utilizing said microcontroller to implement a vector control technique to generate electrical control signals for adjusting the frequency and magnitude of said sinusoidal waveforms according to said phase current data, said rotor position data, the voltage supplied by said power source, and said torque command signal, wherein generating said control signals includes the step of referring to look-up tables in an electronic memory when operating said motor in a constant torque mode to thereby generate said control signals; and utilizing said microcontroller to communicate said switching signals for creating sinusoidal waveforms to said inverter to thereby transmit sinusoidal waveforms to said motor and thereby control the torque of said motor.