Electric machine has comprises stator, rotor, control device and coil, where coil is arranged in rotor or in stator, and energization of coil is adjusted by change of pulse duty factor of pulse width modulation by control device

摘要

The electric machine (21) comprises a stator, a rotor (32), a control device (35) and a coil (26), where the coil is arranged in the rotor or in the stator. The energization of the coil is adjusted by a change of the pulse duty factor of pulse width modulation by the control device to the increasing load of the electric machine in order to align a characteristic of the electrical machine to an ideal characteristic.