Elevator motor control

Details Elevator motor control Elevator motor control

1987-03-16

1988-12-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, H02P 540

Patent

active

047913460

ABSTRACT:
A method of forming the amplitude of the reference voltage of a three-phase inverter supplying a squirrel cage motor requires no current measuring elements. In this method, the amplitude is formed by finding in predetermined constant flux curves which represent the squirrel cage motor in question, and in which the motor rotor current frequency appears as parameter, a curve from which is obtained the amplitude of the motor stator voltage, i.e. of the inverter reference voltage, corresponding to the frequency of the motor's stator voltage, i.e. of the inverter reference voltage, so that the magnetic flux in the stator will be constant.

REFERENCES:
patent: 3851234 (1974-11-01), Hoffman et al.
patent: 3909687 (1975-09-01), Abbondanti
patent: 3989991 (1976-11-01), Brennen et al.
Leonhard, W., Control of Electrical Drives, Springer-Verlag 1985, pp. 205-214.
Murphy, J. M. D., Thyristor Control of A.C. Motors, Pergamon Press, 1973, pp. 111-115.

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