Patent ID: 8648559
Filing Date: 2014-02-11
Classification: B60L,Y02T

Abstract:
1. A system for controlling the propulsion of a vehicle, the system comprising: a direct current bus for receiving direct current electrical energy from an electrical energy source; a first motor for applying rotational energy to a respective first wheel of the vehicle; a second motor for applying rotational energy to a respective second wheel of the vehicle; a first inverter coupled to the first motor, the first inverter receiving direct current electrical energy from the direct current bus, the first inverter providing a first group of alternating currents with at least one corresponding reference phase; and a second inverter coupled to the second motor, the second inverter receiving direct current electrical energy from the direct current bus, the second inverter providing a second group of alternating currents with a phase shift comprising a phase offset of approximately thirty degrees with respect to the at least one reference phase, such that the phase shift is effective to reduce the direct current ripple on the direct current bus, where the first motor and the second motor generally have a same number of pole pairs.