Rotor angle estimation for permanent magnet synchronous motor drive
First Claim
1. A method of determining a rotor angle in a drive control for a motor, comprising the steps of:
- a) determining a rotor magnetic flux in the motor;
b) estimating the rotor angle on the basis of the rotor magnetic flux; and
c) correcting the estimated rotor angle on the basis of reactive power input to the motor.
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Accused Products
Abstract
A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on the basis of reactive power input to the motor. Step (a) may include the step of non-ideal integration of stator voltage and current values. Step (b) may include the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F). Step (c) may include the steps of (1) calculating a first reactive power input value as 1.5*We*(C_Lq *I*I) and a second reactive power input value as 1.5*(Vq*id−Vd*iq); (2) determining a difference between said first and second reactive power input values; and (3) applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle.
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Citations
15 Claims
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1. A method of determining a rotor angle in a drive control for a motor, comprising the steps of:
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a) determining a rotor magnetic flux in the motor;
b) estimating the rotor angle on the basis of the rotor magnetic flux; and
c) correcting the estimated rotor angle on the basis of reactive power input to the motor. - View Dependent Claims (2, 3)
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4. A method of determining a rotor angle in a drive control for a motor, comprising the steps of:
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estimating a rotor angle; and
correcting the estimated rotor angle on the basis of reactive power input to the motor.
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5. A system for determining a rotor angle in a drive control for a motor, comprising:
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a) a first circuit for determining a rotor magnetic flux in the motor;
b) a second circuit for estimating the rotor angle on the basis of the rotor magnetic flux; and
c) a third circuit for correcting the estimated rotor angle on the basis of reactive power input to the motor. - View Dependent Claims (6, 7, 11, 12)
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8. A system for determining a rotor angle in a drive control for a motor, comprising:
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a circuit for estimating a rotor angle; and
a circuit for correcting the estimated rotor angle on the basis of reactive power input to the motor. - View Dependent Claims (9, 10, 13, 14, 15)
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Specification