| 摘要 |
PURPOSE:To eliminate windings for detecting pole position by outputting phase terminal voltage commands from a circuit for distributing a gate signal to a switching element, and using a magnetic flux signal obtained by integrating a multiplied value of the command and a DC input voltage detected value as a position signal of a rotor pole. CONSTITUTION:A three-phase synchronous motor 20 has stator windings 21 in which powers are supplied through a three-phase inverter 20 having three- phase bridge-connected switching elements to convert a DC power from a DC current source 1 into three-phase AC. An output phase of the inverter is converted in response to a rotor pole position of the motor 20. In this case, U-phase, V-phase and W-phase terminal voltage command signals of the inverter 10 are output by a logic circuit 28 of a control circuit 24, and the command signals are multiplied by an input current voltage value of the inverter 10 to be detected by a voltage sensor 33. The multiplied result is integrated by an integrator 26, and a magnetic flux signal obtained therefrom is output to the inverter 10 as a position signal of the rotor pole. |
