Quadrature axis winding for sensorless rotor angular position control of single phase permanent magnet motor

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• and
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator, and the stator including stator teeth, at least two of the stator teeth having a centrally situated notch and the quadrature axis winding being positioned in the notches of the at least two of the stator teeth.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• and
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator, and the stator including stator teeth, at least two of the stator teeth each having multiple notches, and the quadrature axis winding comprising multiple coils with each coil situated in respective ones of the notches in the at least two of the stator teeth.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• and
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator, and the stator including stator teeth, at least three of the stator teeth having a notch and the quadrature axis winding being positioned in the notches of the at least three of the stator teeth.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator;
• an integrator coupled to the quadrature axis winding for phase retarding the output signal, said output signal being phase retarded about 90 degrees by the integrator at a rated speed of the motor;
• and
• a comparator coupled to the integrator for detecting zero crossings of the phase retarded output signal to provide a first commutation signal for commutating the main winding of the stator.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position. said quadrature axis winding being positioned out-of-phase from a main winding of the stator;
• an integrator coupled to the quadrature axis winding for phase retarding the output signal, said output signal being phase retarded by the integrator by a number of degrees which decreases as a speed of the motor increases;
• and
• a comparator coupled to the integrator for detecting zero crossings of the phase retarded output signal to provide a first commutation signal for commutating the main winding of the stator.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator;
• an integrator coupled to the quadrature axis winding for phase retarding the output signal, said output signal being phase retarded by the integrator by about ninety degrees at medium speeds of the motor and by a lesser number of degrees at a rated speed of the motor;
• and
• a comparator coupled to the integrator for detecting zero crossings of the phase retarded output signal to provide a first commutation signal for commutating the main winding of the stator.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator;
• an integrator coupled to the quadrature axis winding for phase retarding the output signal;
• a comparator coupled to the integrator for detecting zero crossings of the phase retarded output signal to provide a first commutation signal for commutating the main winding of the stator;
• a rectifier coupled to the quadrature axis winding for rectifying the output signal;
• and
• a lowpass filter for filtering the rectified output signal to provide a velocity signal.

A single phase permanent magnet motor comprising:

• a rotor;
• a stator;
• a quadrature axis winding positioned for generating an output signal representative of rotor angular position, said quadrature axis winding being positioned out-of-phase from a main winding of the stator;
• and
• a commutation estimator circuit responsive to the output signal generated by the quadrature axis winding for estimating zero crossings of back electromotive force (EMF) generated by the main winding and providing a commutation signal to commutate the main winding of the stator in advance of the estimated zero crossings of the back EMF by an angle .theta. calculated by the following:
• ##EQU6## where .omega. is the speed of the rotor, I.sub.PEAK is a peak current in the main winding corresponding to a desired speed and/or torque of the motor, L is the motor inductance in the main winding, and V.sub.S is the voltage across the main winding.