Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1990-03-19
1991-10-15
Ip, Paul
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318269, 112275, 112277, 364513, H02P 506, D05B 6926
Patent
active
050577573
ABSTRACT:
A load of an electronic sewing machine is self-diagnosed by a control system to cause a DC motor to be operated under control to drive upper and lower shafts of the sewing machine. The control system includes an evaluating device to which a voltage value applied to the DC motor and a rotating speed of the DC motor, both detected, are inputted for determining a current value supplied to the DC motor and a power loss of the DC motor. These data are supplied to a fuzzy theory applying device for estimating if the power loss of the DC motor exceeds a rated value by application of a prescribed fuzzy rule. A control command signal representing an amount of the excessive power loss is outputted from the fuzzy theory applying device to the DC motor for the control of the applied voltage. No need to directly measure the current value, and therefore no need to provide a current detecting resistor in a control circuit.
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Ip Paul
Janome Sewing Machine Industry Co. Ltd.
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