Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1981-12-14
1984-08-21
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318807, H02P 540
Patent
active
044672624
ABSTRACT:
Sinusoidal excitation currents are supplied to the three terminals of a "wye" or "delta" connected three phase motor by an improved multiphase motor energizing drive system. For each terminal associated with a different phase, an individual feedback signal representing the current flowing into that respective terminal is sensed and subtracted from its corresponding controllable sine wave reference command to produce a current error signal for each terminal. The error signal for each of these currents is preferably converted to a two-state signal by means of an associated pulse width modulator. The modulator outputs are used to control power semiconductor switches which connect the corresponding motor terminal to either the positive or negative dc voltage. In the preferred system, for one of the terminals, the associated current feedback loop and reference command are omitted, and the associated pulse width modulator is driven by the inverted sum of the error signals from the other two phases. The result is inherently balanced multiphase excitation currents into the motor terminals.
REFERENCES:
patent: 4267499 (1981-05-01), Kurosawa
patent: 4272715 (1981-06-01), Matsumoto
patent: 4361794 (1982-11-01), Kawada et al.
Smith Jr. David
The Charles Stark Draper Laboratory Inc.
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