Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-09-09
1995-10-31
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318801, 318806, 318811, 388832, H02P 528
Patent
active
054633028
ABSTRACT:
The invention relates to a method for slip compensation in a squirrel cage induction motor when the motor (2) is fed by an inverter (1) without feedback at a supply frequency less than 20% of the rated supply frequency of the motor after the motor has first been fed at a frequency more than 50% of the rated frequency for a period of time at least equal to a mechanical time constant of a combination formed by the motor and a load device, wherein a term (kT) proportional to the torque of the motor is determined and added to the set value of the rotation speed (n) to effect slip compensation. To improve the compensation accuracy, the value of said compensation term is stored in a memory before transition from the frequency more than 50% of the rated frequency to a frequency less than 50% of the rated frequency, and the stored compensation term is used as such for slip compensation when the supply frequency of the motor is less than 20% of the rated frequency.
REFERENCES:
patent: 4926105 (1990-05-01), Mischenko et al.
patent: 5272429 (1993-12-01), Lipo et al.
Power Electronics; Mohan et al.; 1989; pp. 311-311, 333 and 335, John Wiley & Sons, New York.
No affiliations
ABB Industry OY
Masih Karen
Shoop Jr. William M.
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