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This paper presents a new scalar-controlled double-stator permanent magnet brushless (DS-PMBL) motor. Because of the special phase decoupling structure, scalar control strategy is newly incorporated into the time-stepping finite element method (TS-FEM) to analyze the transient performance of machine. The complicated coordinate transformation is avoided and constant torque and flux weakening control operation is obtained. Based on the time-stepping finite element method (TS-FEM), the torque-speed capability and the transient responses at startup, sudden load change and sudden command change are simulated to verify the validity of the proposed scalar control. Experimental results verified the validity of the analysis method.