| abstract |
Revolution, direct torque for permanent magnet motor, there is provided a kind of use inverter is driven with based on the wavy electric current of ideal sinusoidal of required minimum on-off times, and pole low-speed range that can be near zero velocity starts the position-sensor-free type of drive for driving.The neutral point potential of permanent magnet motor 4 is detected synchronously with the PWM waveform of inverter.From the rotor-position for becoming disorder of internal organs reckoning permanent magnet motor 4 of the neutral point potential.In the detection during property point current potential, by the moment of each phase of PWM waveform is staggered, to generate three kinds or four kinds of inverter output voltages are not zero the on off state of vector, the neutral point potential in two kinds of on off states of wherein at least is sampled, the rotor-position of three-phase synchronous motor is calculated. |