Patent
Polyphase motor drive system with balanced modulation
TLDR
In this article, an improved multiphase motor energizing drive system was proposed, in which each terminal associated with a different phase is sensed and subtracted from its corresponding controllable sine wave reference command to produce a current error signal for each terminal.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.read more
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Patent
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Polyphase induction motor system and operating method
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References
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Patent
Torque regulating induction motor system
TL;DR: In this article, a torque regulating alternating current induction motor control system comprising a motor flux sensing coil arrangement mounted on the induction motor stator for sensing the actual flux produced across the rotor-stator air gap of the motor and deriving the motor flux voltage signal proportional to the actual motor flux was presented.
Patent
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Patent
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Patent
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TL;DR: In this paper, the speed of an induction motor fed from a frequency converter is controlled by controlling the primary current by a primary current vector, which is computed from the sum value and a current component which influences only the torque to control the frequency converter.
Patent
Adjustable speed polyphase a-c motor drive utilizing an in-phase current signal for motor control
Graf C,Skogsholm E,Volkmann W +2 more
TL;DR: In this paper, the current and VOLUME 7, 2019 current and current power of an A-C MOTOR are adjusted by a phase control signal having an average value proportional to the current power.