Patent ID: 8519648

Claim:
A method for controlling field-weakening accuracy in an integrated permanent magnet (IPM) electric motor, comprising: generating a phase voltage feed back signal V ph , based in part on pre-defined optimal current commands (I d * and Iq*) received by the IPM; generating a phase voltage command V phcmd based in part on a temperature (T R ) of a magnetic rotor of the IPM; generating a phase voltage error V error by subtracting the phase voltage feed back signal V ph from the phase voltage command V phcmd ; generating a d-axis command current correction values ΔI d and a q-axis command current correction value ΔI q from the phase voltage error V error ; and adjusting the pre-defined optimal current commands (Id* and Iq*) by the d-axis and the q-axis command current correction values (ΔI d and ΔI q ).