Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1996-09-23
1998-05-05
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318749, 318800, 318801, 318609, 318610, H02P 528
Patent
active
057479631
ABSTRACT:
In a method for controlling an electric motor the stator voltage frequency of the motor is determined by adding the optimal slip frequency of the motor and the desired rotational frequency of the rotor. The magnitude of the stator voltage is determined by subtracting the actual rotational frequency and the desired rotational frequency of the rotor. The desired stator frequency and magnitude are inputted into a pulse width modulation unit which controls an inverter to supply the appropriate voltages to the motor. The operation of the motor with optimal slip has the advantage that the efficiency is optimal independent of the load.
REFERENCES:
patent: 3671831 (1972-06-01), Chausse et al.
patent: 4625834 (1986-12-01), Tanahashi
Handy Robert M.
Hightower Robert F.
Lockett Kim
Motorola Inc.
Shoop Jr. William M.
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