Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1999-01-29
2000-08-22
Masih, Karen
Electricity: motive power systems
Induction motor systems
Primary circuit control
318254, 318138, 318439, 318449, 318801, 318800, 318799, 318807, 318700, 318727, H02P 7628
Patent
active
061077763
ABSTRACT:
The invention includes: a random number generating unit which outputs a random number in driving of an AC motor by a voltage source inverter, a maximum/minimum triangular wave frequency setting unit which calculates a maximum triangular wave frequency and minimum triangular wave frequency using the inverter frequency, a triangular wave frequency calculating unit which calculates a triangular wave frequency from the random number, the maximum/minimum triangular wave frequency, and a triangular wave peak pulse, a triangular wave generating unit which calculates a triangular wave in accordance with this triangular wave frequency and outputs a triangular wave peak pulse, a voltage reference generating unit which inputs inverter current references and the motor revolution frequency, and which calculates the inverter frequency and voltage references of each phase of the inverter, and a PWM pulse generating unit which inputs the voltage references and triangular wave of each phase which are calculated and outputs a PWM pulse pattern for each phase, in accordance with the principles of pulse width modulation.
REFERENCES:
patent: 4394622 (1983-07-01), Yoshida et al.
patent: 5162709 (1992-11-01), Ohi
Trzynadlowski, A.M., et al., "Random Pulse Width Modulation Techniques for Converter-Fed Drive Systems--A Review, " IEEE Transactions on Industry Applications, vol. 30, No. 5, pp. 1166-1175, (Sep./Oct., 1994).
Kabushiki Kaisha Toshiba
Masih Karen
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