Method for controlling an electric motor and electric apparatus

Details Method for controlling an electric motor and electric apparatus Method for controlling an electric motor and electric apparatus

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

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