Software-controlled electronic circuit for switching power to a three-phase motor
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United States of America Patent
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Mar 21, 2017
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N/A
app pub date -
Jan 8, 2016
filing date -
Jan 8, 2016
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Abstract
The method of controlling a rotating three-phase motor involves generating in synchronism with the rotation of the motor a variable duty cycle pulse-width modulated signal for each of the switching circuit components used to supply current to the motor coils. The generated variable duty cycle pulse-width modulated signals control the switching circuit components to selectively place pairs of motor coils in current conducting states and to develop an associated varying voltage for each of the phases. This varying voltage is monitored to identify the one phase that is at a voltage in between the voltages of the other two phases. Then for the identified one phase, the variable duty cycle pulse-width modulated signal is specially generated so that when the switching circuit components of the other two phases are concurrently switched on, the switching circuit component of the identified one phase is not switched on.
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