Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-07-14
1991-06-11
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318807, 318809, H02A 742
Patent
active
050235389
ABSTRACT:
A PWM inverter apparatus used for driving an a.c. motor, including an inverter having an output part connected to the a.c. motor and switching elements on-off controlled by a PWM signal. The inverter apparatus also includes a part for receiving, at an interval of a given sampling period, status command information specifying a desired status of a vector of a rotating magnetic flux in the a.c. motor; a part for predicting, on the basis of at least the status command information received at each sampling time, the status of the vector of the rotating magnetic flux which will be produced at a next sampling time; a part for calculating a difference vector between the status of the vector of the rotating magnetic flux specified by the status command information received at a present sampling time and the predicted status of the vector of the rotating magnetic flux which will be produced at a next sampling time; a part for synthesizing the difference vector using selected reference voltage vectors from among a plurality of predetermined reference voltage vectors; and a part for generating a PWM signal for controlling the switching elements of the inverter so as to produce the selected reference voltage vectors.
REFERENCES:
patent: 4477763 (1984-10-01), Asano et al.
Fujii Hiroshi
Mutoh Nobuyoshi
Sakai Keijiro
Ueda Akiteru
Cabeca John W.
Hitachi , Ltd.
Shoop Jr. William M.
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