Electricity: motive power systems – Induction motor systems – With voltage source connected to motor secondary
Patent
1995-10-13
1997-12-09
Ro, Bentsu
Electricity: motive power systems
Induction motor systems
With voltage source connected to motor secondary
318772, 318810, H02P 7622
Patent
active
056964323
ABSTRACT:
To control the output from an induction motor with a main winding and an auxiliary winding with multiple taps, varying output stages of the motor are adjusted by the activation of the auxiliary winding or one of its part-windings. According to the invention, the coarse adjustment of the power to be output by the motor is effected by the selection of a certain output stage and a repeating digital m-bit keying pattern generated simultaneously for the purpose of fine adjustment, so that the motor is driven alternately at the set output stage and the next higher or next lower output stage as a function of the sequential logic values of the keying pattern. By means of the process complying with the invention, precise power control is possible which can be used to advantage for the adjustment of output. In addition, a device is described to carry out the process complying with the invention, according to which a microprocessor undertakes the coarse adjustment by way of a control circuit while simultaneously generating the m-bit keying pattern, which is stored in a ring counter, which itself directs the logic values of the keying pattern to the control circuit in succession.
REFERENCES:
patent: 4300077 (1981-11-01), Katz et al.
patent: 4737701 (1988-04-01), Hoemann et al.
patent: 4739240 (1988-04-01), MacMinn
patent: 4806838 (1989-02-01), Weber
patent: 4843295 (1989-06-01), Thompson et al.
Ro Bentsu
TEMIC Telefunken microelectronic GmbH
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