Apparatus for operating an elevator

Details Apparatus for operating an elevator Apparatus for operating an elevator

1985-06-04

1987-06-30

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318807, 187119, H02P 540

Patent

active

046773614

ABSTRACT:
A magnetic flux detecting coil for detecting a magnetic flux in the air gap between the stator is provided in the stator and rotor of an induction motor, the actual value of the secondary winding crossing magnetic flux is calculated on the basis of the detected output of the detecting coil, this value is compared with the secondary winding crossing magnetic flux command value to correct the secondary winding resistance value, thereby controlling to correct the slip frequency. Thus, the torque produced by the motor can be stabilized irrespective of the temperature rise of the motor.

REFERENCES:
patent: 3783358 (1974-01-01), Krauer
patent: 3805135 (1974-04-01), Blaschke
patent: 4423367 (1983-12-01), Blaschke et al.
patent: 4431957 (1984-02-01), Chausse et al.
patent: 4447787 (1984-05-01), Schwesig et al.

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