Method for controlling the firing angle of an electric motor
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United States of America Patent
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Dec 28, 2010
Grant Date -
May 24, 2007
app pub date -
Jan 19, 2007
filing date -
Jan 21, 2003
priority date (Note) -
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Abstract
A method for controlling the firing angle of a single-phase AC powered electric motor is provided which is triggered by at least one locking electronic switch, such as a triac (T1 and T4) located between the distribution voltage (U.sub.V) and at least one motor winding (A, B). According to said method, intervals are defined within which the triacs (T2 to T4) are to be fired according to the curve of the distribution voltage (U.sub.V) and the voltage (U.sub.EMK) induced in the respective winding in order to allow the motor to start as quickly and smoothly as possible and run quietly and at high efficiency.
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