Converter and method for driving an electric AC machine

摘要

In a method and a converter for driving an electric AC machine (3) by means of a pulse amplitude (PAM) inverter supplying the AC machine (3) with electrical power through three or more drive connectors (13), the following steps are performed of applying to the three or more drive connectors (13), in a sequence of torque intervals and measurement intervals ...
€¢ during the torque intervals, one or more voltage pulses for generating a torque in the AC machine (3); the voltage pulses having as average height a first voltage (Vt),
€¢ during the measurement intervals, one or more voltage pulses for measuring the position of the rotor of the AC machine (3); the voltage pulses having as average height a second voltage (Vm);
€¢ wherein the second voltage (Vm) is at least two times the first voltage (Vt).