Abstract: Three-phase/d-q converters convert an output voltage V outputted from a power converter and a coil current flowing through a propulsion coil to a voltage and a current in a dq rotary coordinate system, respectively. A speed electromotive force observer estimates speed electromotive force based on these voltage and current, and a vehicle angular speed &ohgr;, and a speed electromotive force phase generator calculates a speed electromotive force phase &thgr;e based on the estimated speed electromotive force Zd, Zq. A phase synchronization controller constituted as a secondary PI control system stabilizes the speed electromotive force phase &thgr;e and outputs it as a phase reference &thgr;*. Accordingly, it is possible in a system of an LSM vehicle to obtain the stable phase reference &thgr;* with a minimum deviation even when the vehicle is running at low speed.

Abstract: In the control system, a propulsion force is computed by a propulsion force computing unit based on a current command value outputted from a speed controller, an acceleration is computed by an acceleration computing unit based on the propulsion force and a running resistance outputted from a running resistance computing unit, a speed is computed by a speed computing unit based on the acceleration, and a simulated phase reference value is computed by a phase computing unit. Then, the simulated phase is computed by adding, at a simulated phase computing unit, a predetermined phase delay (e.g. 30 degrees) to the simulated phase reference value. The addition of the phase delay results in generation of synchronizing force in the LSM and thus little deviation between the simulated phase and the actual phase.

Abstract: In the control system, a propulsion force is computed by a propulsion force computing unit based on a current command value outputted from a speed controller, an acceleration is computed by an acceleration computing unit based on the propulsion force and a running resistance outputted from a running resistance computing unit, a speed is computed by a speed computing unit based on the acceleration, and a simulated phase reference value is computed by a phase computing unit. Then, the simulated phase is computed by adding, at a simulated phase computing unit, a predetermined phase delay (e.g. 30 degrees) to the simulated phase reference value. The addition of the phase delay results in generation of synchronizing force in the LSM and thus little deviation between the simulated phase and the actual phase.

Abstract: Three-phase/d-q converters convert an output voltage V outputted from a power converter and a coil current flowing through a propulsion coil to a voltage and a current in a dq rotary coordinate system, respectively. A speed electromotive force observer estimates speed electromotive force based on these voltage and current, and a vehicle angular speed &ohgr;, and a speed electromotive force phase generator calculates a speed electromotive force phase &thgr;e based on the estimated speed electromotive force Zd, Zq. A phase synchronization controller constituted as a secondary PI control system stabilizes the speed electromotive force phase &thgr;e and outputs it as a phase reference &thgr;*. Accordingly, it is possible in a system of an LSM vehicle to obtain the stable phase reference &thgr;* with a minimum deviation even when the vehicle is running at low speed.