Method and apparatus for compensating for cable charging...

Electricity: motive power systems – Induction motor systems – Primary circuit control

Reexamination Certificate

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Reexamination Certificate

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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.

REFERENCES:
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patent: 5689169 (1997-11-01), Kerkman et al.
patent: 5814967 (1998-09-01), Garces et al.
patent: 5850132 (1998-12-01), Garces
patent: 6002234 (1999-12-01), Ohm et al.
patent: 6690139 (2004-02-01), Seibel
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.
Effects of Parasitics on The Control of voltage Source Inverters, IEEE-APEC 2001, Mar. 4-8, 2001; 10 pages, Kerkman et al.
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.

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