Abstract
Phase currents should be measured in real time for vector control of a 2-phase induction motor. Generally, the phase currents of the motor are measured using two Hall current sensors installed at the output terminal of an inverter. Unfortunately, Hall current sensors are expensive and uneconomical because a vector-controlled inverter for 2-phase induction motor is mainly used in low-power and low-price applications. This paper proposes a low-cost current measurement method using two shunt resistors instead of expensive Hall current sensors. The proposed method can measure the phase currents under all operating conditions of the motor. This method was applied to an experimental vector-controlled inverter for 2-phase induction motor of 220(V)/360(W) and was verified through computer simulations and experimentation.
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