In JMAG, it is possible to create a plant model (JMAG-RT motor model) suitable for the actual machine, taking into account magnetic saturation characteristics and space harmonics of the motor. By importing this plant model into a control/circuit simulator, it is possible to carry out coupled simulation taking into account both detailed motor characteristics such as magnetic saturation and space harmonics, and motor driver control characteristics.
In this example, JMAG-RT is used to obtain the torque of a wound-field synchronous motor (below WFSM) and the coil inductance current dependence, and the spatial harmonic components contained in them. Furthermore, we will simulate the WFSM current control by importing a JMAG-RT motor model created as a plant model into the control/circuit simulator.
Current Waveform, Torque Waveform, Inductance Waveform
The field current waveform when vector control is carried out is shown in Fig. 1, the armature current waveforms in Fig. 2, the torque waveform in Fig. 3, and the inductance waveforms in Fig. 4 and Fig. 5. From each waveform, it is understood that a large current flows momentarily immediately after turning on the power, and the torque also increases. Moreover, it can be confirmed that a steady-state condition is gradually converged to. On the other hand, since the JMAG-RT motor model takes into account the shape of the motor, the current and torque waveforms which include space harmonic components caused from the slot shape can be confirmed in steady state.