Method of controlling a three-phase permanent magnet synchronous motor for reducing acoustic noise and relative control device

A method of feedback controlling a three-phase permanent magnet synchronous motor according to a vector control technique using a feedback loop including a feedback circuit coupled to windings of the motor for generating feedback quadrature and direct current components according to Clarke and Park transforms of currents sensed through the windings of the motor, quadrature and direct current controllers respectively input with differences of the quadrature and of the direct current components with corresponding quadrature and direct current reference values, respectively, for generating respective quadrature and direct voltage signals, and a Clarke and Park anti-transform circuit block coupled to the quadrature and direct current controllers for generating control signals of a power driving stage of the motor, the method comprising:

• sensing the rotor position and the rotor speed;
• generating additional compensation signals for compensating the control signals supplied to the power driving stage to reduce motor torque ripple;
• adding the additional compensation signals downstream from the quadrature and direct current controllers by one of
• generating the additional compensation signals as quadrature and direct voltage compensation signals and adding them to the quadrature and direct control voltage signals to generate compensated quadrature and direct signals, and supplying the compensated quadrature and direct signals to the power driving stage of the motor by at least providing the compensated quadrature and direct signals to the Park and Clarke anti-transform circuit block, and
• adding the additional compensation signals directly to the control signals supplied to the power driving stage of the motor.

A method of controlling a synchronous motor comprising windings and a power driving stage coupled to the windings, the method comprising:

• using a feedback circuit coupled to the windings to generate first and second current feedback components based upon currents sensed through the windings;
• using first and second current controllers respectively input with differences of the first and second current feedback components with corresponding first and second reference current values, respectively, to generate respective first and second voltage signals;
• using an anti-transform circuit coupled to the first and second current controllers for generating control signals for the power driving stage;
• generating additional compensation signals as quadrature and direct voltage compensation signals and adding them to the first and second voltage signals to generate compensated quadrature and direct signals, and supplying the compensated quadrature and direct signals to the power driving stage by at least providing the compensated quadrature and direct signals to the anti-transform circuit.

A method of controlling a synchronous motor comprising windings and a power driving stage coupled to the windings, the method comprising:

• using a feedback circuit coupled to the windings to generate first and second current feedback components based upon currents sensed through the windings;
• using first and second current controllers respectively input with differences of the first and second current feedback components with corresponding first and second reference current values, respectively, to generate respective first and second voltage signals;
• using an anti-transform circuit coupled to the first and second current controllers for generating control signals for the power driving stage;
• generating additional compensation signals for compensating the control signals;
• and
• adding the additional compensation signals to the control signals.

A feedback control device for a three-phase permanent magnet synchronous motor comprising a power driving stage, windings coupled to the power driving stage, and a rotor coupled to the windings, the feedback control device comprising:

• a feedback circuit coupled to the windings and configured to generate feedback quadrature and direct current components according to the Clarke and Park transforms of currents sensed through the windings;
• quadrature and direct current controllers, respectively input with differences of the quadrature and of the direct current components with corresponding quadrature and direct current reference values, respectively, and configured to generate respective quadrature and direct voltage signals;
• a Park and Clarke anti-transform circuit coupled to said quadrature and direct current controllers, and configured to generate control signals for the power driving stage;
• at least one sensor configured to sense the rotor position and the rotor speed;
• a first compensation circuit configured to generate additional compensation signals for compensating the control signals supplied to the power driving stage to reduce motor torque ripple;
• and
• a second compensation circuit downstream from said quadrature and direct current controllers, and configured to add the additional compensation signals.

A feedback control device for a synchronous motor comprising a power driving stage, windings coupled to the power driving stage, the feedback control device comprising:

• a feedback circuit coupled to the windings and configured to generate first and second current feedback components based upon currents sensed through the windings;
• first and second controllers, respectively input with differences of the first and second current feedback components with corresponding first and second current reference values, respectively, and configured to generate respective first and second voltage signals;
• an anti-transform circuit coupled to said first and second current controllers, and configured to generate control signals for the power driving stage;
• a first compensation circuit configured to generate additional compensation signals for compensating the control signals;
• and
• a second compensation circuit coupled to said first and second controllers, and configured to add the additional compensation signals.