A new model predictive control method of electric drives with fixed switching frequency is presented. It proposes a numerical method based on circular dichotomy to calculate and select reference voltage vectors, which are given to pulse width modulator to generate switching signals. It is verified and compared with the existing dichotomy-based method in a predictive current controlled electric drive system with space vector pulse width modulation through simulation. Compared to existing method, the proposed method can significantly reduce code complexity and calculation effort without deteriorating system performance.