Start-up method and system 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) estimating the rotor angle on the basis of the rotor magnetic flux in the motor; and
b) correcting the estimated rotor angle on the basis of reactive power input to the motor;
wherein step (a) further comprises the step of (al) estimating the rotor angle during motor start-up according to a predetermined motor load model in conjunction with a start-up sequencer.
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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. At higher motor frequencies, the estimated rotor angle is based on the rotor magnetic flux. At lower frequencies, it is based on a predetermined motor load model which is used in conjunction with a start-up sequencing logic circuit.
31 Citations
46 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) estimating the rotor angle on the basis of the rotor magnetic flux in the motor; and b) correcting the estimated rotor angle on the basis of reactive power input to the motor; wherein step (a) further comprises the step of (al) estimating the rotor angle during motor start-up according to a predetermined motor load model in conjunction with a start-up sequencer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 35, 36, 43, 44)
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9. 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; and b) estimating the rotor angle on the basis of the rotor magnetic flux in the motor, and during motor start-up according to a predetermined motor load model in conjunction with a start-up sequencer; and c) correcting the estimated rotor angle on the basis of reactive power input to the motor; wherein step (a) includes the step of non-ideal integration of stator voltage and current values. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 37, 38)
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18. A system for determining a rotor angle in a drive control for a motor, comprising:
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a first circuit for estimating a rotor angle on the basis of rotor magnetic flux in the motor; and a second circuit for correcting the estimated rotor angle on the basis of reactive power input to the motor; wherein said first circuit further estimates the rotor angle during motor start-up according to a predetermined motor load model in conjunction with a start-up sequencer. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 39, 40, 45, 46)
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26. 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; and b) a second circuit for estimating the rotor angle on the basis of the rotor magnetic flux in the motor, and during motor start-up according to a predetermined motor load model in conjunction with a start-up sequencer; and c) correcting the estimated rotor angle on the basis of reactive power input to the motor; wherein said first circuit carries out non-ideal integration of stator voltage and current values. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 41, 42)
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Specification