Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-02-22
2005-02-22
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
Reexamination Certificate
active
06859008
ABSTRACT:
A method and apparatus for use with a three phase AC motor controller linked to a three phase motor, the controller receiving a torque command signal and generating a voltage phase angle as a function of the torque command signal, the voltage phase angle in turn used to generate modulating waveforms to drive a PWM inverter that provides voltages on three motor supply lines, the method comprising the steps of during a commissioning procedure, identifying at least one compensation angle that, when mathematically combined with the voltage phase angle, drives the motor to zero operating frequency when a zero torque command is received and, during normal operation and when a zero torque command is received, mathematically combining the compensation angle and the voltage phase angle to generate a compensated phase angle and using the compensated phase angle to generate the modulating waveforms.
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A High Performance Spped Control Scheme of Induction Motor Without Speed And Voltage Sensors, 1986 IEEE IAS Annual Meeting; pp 106-111, Okuyama et al.
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Interaction Of Drive Modulation and Cable Parameters on AC Motor Transients, IEEE Transaction on Industry Applications, vol. 33, No. 3, May/Jun. 1997, pp. 722-731, Kerkman et al.
Leykin Rita
Quarles & Brady LLP
Rockwell Automation Technologies Inc.
Walbrun William R.
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