Weakening-field control of a motor

摘要

A motor controller comprises a rotor (Rt) having P poles (where P is 2 or a greater even number); K-phase stator windings (1U,1V,1W) (where K is 2 or a greater integer) for generating magnetic flux interlinks with said rotor; a current command production unit (30) for producing current commands that are current values for stator currents flowing through said stator windings; drive unit (10) for supplying electric power to said stator windings based on said current commands; a stator current detection unit (2U,2V,2W) for detecting stator currents flowing through said stator windings and producing stator current signals (iu,iv,iw); a saturation degree production unit (20) for producing a saturation degree indicating by what amount said stator current is not following said current command; and a pole-position signal production unit (3) for producing pole-position signals (CSU, CSV,CSW) based on pole positions of said rotor. The current command production unit (30) produces the current commands (Id* ,Iq*) based on saturation degree (Sat) ; and the saturation degree production unit (20) producing the saturation degree (Sat) based on the current commands (Id*,Iq*), the stator current signals (iu,iv,iw), and the pole-position signals (CSU,CSV,CSW).