Patent ID: 8907612
Filing Date: 2014-12-09
Classification: B60L,Y02T

Abstract:
1. An inverter for driving an AC electric motor that includes a stator having at least two phases and a rotor, the inverter comprising: a plurality of connection terminals configured to connect to a DC bus associated with a DC electrical energy source and a DC electric voltage; an AC generator configured to deliver a current to a terminal block that is to be connected to phases of the AC electric motor; a power supply line positioned between the connection terminals and the AC generator; a power supply current measurement line on which circulates a measurement of current on the power supply line; a plurality of motor current measurement lines on which circulate measurements of alternating current on a plurality of the phases of the AC electric motor, to enable alternating current circulating in each of the plurality of the phases to be known; a first input configured to receive information that includes at least one source limit current value, which corresponds to the current on the power supply line, and a driving torque setpoint (Ccons) obtained from a torque demand setpoint (C CAN); and a controller configured to receive the measurement of current on the power supply line, the alternating current circulating in each of the plurality of the phases of the AC electric motor, maximum and minimum limit currents of the DC electrical energy source, the torque demand setpoint (C CAN), and the driving torque setpoint (Ccons), wherein the controller drives phase currents of the AC electric motor according to the torque demand setpoint (C CAN) by keeping a current flowing in the power supply line at a value compatible with the limit currents of the DC electrical energy source, wherein, in order to drive the phase currents of the AC electric motor, the controller is configured to: wherein, when the current on the power supply line reaches a limit current of the DC electrical energy source, the driving torque (Cpil) is reduced relative to the driving torque setpoint (Ccons) by a difference torque (Ct) with a value proportional to an overshoot of the limit current of the DC electrical energy source.