Xiaoyong Shen

Design of doubly salient permanent magnet motor for small displacement ISG mild hybrid

The performance of hybrid motor directly affects hybrid vehicle performance and fuel economy. In this paper, doubly salient permanent magnet motor is selected as vehicle motor of small displacement ISG mild hybrid. Magnet field superposition method is proposed to analyze the static characteristics of doubly salient permanent magnet motor. Namely, the “partition method” is adopted to analyze magnet field static characteristics when excitation windings operate alone. Then two-dimensional finite element is adopted to analyze magnet field static characteristics when permanent magnet operates alone. Doubly salient permanent magnet motor static characteristics are obtained by superposition, and motor structural parameters are designed through analogy. Finally, through physical prototype test, objectively test the performance of the prototype design to achieve the research and design of hybrid doubly salient permanent magnet motor.

Study on Feed-Forward MAP-Based Vector Control Method of Vehicle Drive Motor

Contraposing to the shortage of narrow efficient area and over current when vector control method is applied to vehicle drive motors, this paper proposes a feed-forward MAP-based vector control method of vehicle drive motor. According to required motor torque and speed, directly control the magnitude and direction of voltage space vector to realize the aim of motor torque control. So, the calculation of torque current component and field current component is no need, which not only avoids over current that the PID closed-loop control leads to, improving the reliability of controller, but also avoids the dependence on current measurement, improving control precision and motor efficiency. Finally, simulation results and motor bench test prove this method can significantly enlarge efficient area, and it is suitable for vehicle running conditions.