Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-11-12
1993-09-07
Stephan, Steve L.
Electrical generator or motor structure
Dynamoelectric
Rotary
324544, 340648, 361 23, H02K 1100, H04B 346, H02H 708
Patent
active
052432432
ABSTRACT:
Apparatus and method are disclosed for use with a starting circuit to prevent start-up of an electric motor when the motor's insulation resistance is of a value below a selected insulation resistance limit value below which the motor should not be energized. The selected limit value is a selected percentage of a known maximum value. A variable resistance device, such as a potentiometer, having first and second adjustable resistance portions is adjusted so that the adjusted resistance value of the second portion is of the same percentage of the total resistance value of the first and second portions as the selected percentage discussed above. A DC test voltage of a known value is applied to the motor's insulation resistance to cause a test current to flow therethrough. The test current is directed to flow through the second resistance portion to develop a test voltage. A reference voltage is provided having a value representative of the voltage that would be developed across the second resistance portion by the test current if the unknown value of the insulation resistance was equal to the selected insulation resistance limit value. The test voltage is compared with the reference voltage to provide a control signal having a first value when the test voltage is greater than the reference voltage and a second value when the test voltage is less than the reference voltage. The electric motor is prevented from being energized so long as the control signal is of the first value.
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IBM Technical Disclosure, "DC Motor Control Method Considering Overheat Protection and Performance", vol. 36, No. 1, Jan. 1993, pp. 441-442.
Haszko D. R.
Stephan Steve L.
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