FREQUENCY-CHANGING CONTROL APPARATUS
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United States of America Patent
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Issued Date -
Jan 27, 2011
app pub date -
Jul 22, 2009
filing date -
Jul 22, 2009
priority date (Note) -
Abandoned
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Abstract
A frequency-changing control apparatus includes a rectification circuit, a control circuit, and a frequency-changing driving circuit. The control circuit includes a microprocessor. The frequency-changing control apparatus has variable voltage variable frequency for driving a motor. A temperature detection unit and an alarm device are connected to the microprocessor. The temperature detection unit is able to detect the temperature of the circumstance and convert a temperature value into a signal to be transmitted to the microprocessor for generating an alarm effect via the alarm device so that the operator could know the time of maintenance beforehand, preventing the apparatus from stopping suddenly because of superheat. The present invention is able to decrease the reject rate, reduce the loss of material, and cut down the maintenance cost.
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