Patent ID: 6087801
Filing Date: 2000-07-11
Classification: H02M,H02P

Abstract:
A process for controlling a rotating machine including n phases supplied with alternating current by a voltage inverter comprising n SPmLL switches, wherein m comprises a number of levels represented by a single switch, said n SPmLL switches defining m.sup.n states of a stator phase voltage vector, wherein an electromagnetic torque .GAMMA. and a stator flux .vertline..phi..sub.s .vertline. of said rotating machine is slaved to set portions .GAMMA..sub.ref, .vertline..phi..sub.s .vertline..sub.ref by a servocontrol system in accordance with various control strategies, each strategy of said various control strategies having application conditions, said servocontrol system including a set of sensors whose outputs are transmitted to a sampler for sampling at a sampling period T.sub.e to provide sampled values for the electromagnetic torque and the stator flux of said rotating machine, the sampled values being input to a calculator, said calculator outputting control signals for said SPmLL switches of said voltage inverter in accordance with said application conditions of the control strategy employed, said process for controlling said rotating machine comprising:successively switching n states of said phase voltage vector to move said torque .GAMMA. and said flux .vertline..phi..sub.s .vertline. towards said set points .GAMMA..sub.ref, .vertline..phi..sub.s .vertline. in succession in accordance with an application time where dt.sub.k where k .epsilon.{1, . . . , n} for applying each of said n states of said succession, said successive switching occurring on each sampling,calculating a remaining application time of a current state of said phase vector and calculating and an updated application time of future states of said phase vector, and synchronously with the sampling times and the calculation times, sending SPmLL switch control signals to switch from said current state to the next state to control the rotating machine at the end of the application time of said current state.