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An electrical active roll stabilizer has been designed and developed for improving the vehicle anti-roll performance. The motor actuator composed by a switched reluctance motor(SRM) and a harmonic gear reducer is a key component of the active roll stabilizer to generate the active anti-roll torque. There are three main steps of studying the performance of the motor actuator in this paper. Firstly, the accurate mathematical model of SRM is built in Matlab/Simulink using the data of magnetization characteristics calculated by the finite element analysis using Maxwell/RMxprt. Secondly, the full vehicle roll model is set up and the sliding mode controller based on feedback linearization for roll control is designed in Matlab/Simulink. The controller calculates the real-time ideal anti-roll torques of the front and rear stabilizers based on the lateral acceleration and roll angle.