Position sensorless motor control apparatus

A position sensorless motor control apparatus comprising:

• a current sensor for detecting a phase current value representing the value of a current to a stator winding of a motor;
• a voltage command value generating unit for generating, based on an estimated angle of a rotor of said motor, a phase voltage command value indicating a command value for a voltage to be applied to said stator winding;
• a driving unit for applying voltage to said stator winding based on said phase voltage command value;
• an angle estimating unit for generating said estimated angle;
• and
• a rotational direction command unit for outputting a rotational direction command indicating the direction in which said rotor is to be rotated, and wherein
• when said rotational direction commands indicates a reverse direction, said phase current values for at least two phases are interchanged with each other and said phase voltage command values for said at least two phases are interchanged with each other.

A position sensorless motor control apparatus including an angle estimating unit for estimating a rotor angle of a motor, wherein said angle estimating unit has a fourth signal or a fifth signal derivable from said fourth signal, or angle information of said fourth signal or said fifth signal, said fourth signal having the same waveform as the waveform of a stator winding current, wherein said angle estimating unit:

• calculates an angle error between said fourth signal or said fifth signal, or said angle information, and a signal derived from said stator winding current, or calculates an amplitude error having a defined correspondence with said angle error,
• corrects an estimated angle of said fourth signal or said fifth signal or of said angle information in such a manner as to reduce said angle error or said amplitude error having a defined correspondence with said angle error,
• calculates an amplitude error between the amplitude of said fourth signal or said fifth signal that said angle estimating unit has and the amplitude of the signal derived from said stator winding current, and
• corrects the amplitude of said fourth signal or said fifth signal in such a manner as to reduce said amplitude error.

A position sensorless motor control apparatus including an angle estimating unit for estimating a rotor angle of a motor, wherein said angle estimating unit has a sixth signal or a seventh signal derivable from said sixth signal, or angle information of said sixth signal or said seventh signal, said sixth signal having the same waveform as the waveform of a measured or calculated phase voltage of a stator winding, wherein said angle estimating unit:

• calculates an angle error between said sixth signal or said seventh signal, or said angle information, and a signal derived from said measured or calculated phase voltage of said stator winding, or calculates an amplitude error having a defined correspondence with said angle error,
• corrects an estimated angle of said sixth signal or said seventh signal or of said angle information in such a manner as to reduce said angle error or said amplitude error having a defined correspondence with said angle error,
• calculates an amplitude error between the amplitude of said sixth signal or said seventh signal that said angle estimating unit has, and the amplitude of the signal derived from said measured or calculated phase voltage of said stator winding, and
• corrects the amplitude of said sixth signal or said seventh signal in such a manner as to reduce said amplitude error.