According　to　electrical　vehicle　(EV)　working　requirements,　a　built-in　permanent　magnet　(IPM)　synchronous　motor　is　selected　as　the　topic　motor.　A　mathematical　model　about　the　motor　is　described　here.　To　make　the　EV　run　smoothly,　safely　and　economically,　two　control　loops　for　the　electric　motor　are　developed.　One　is　based　on　motor　current　control,　which　consists　of　maximum　torque　per　ampere　control　and　field　weakening　control.　Other　is　motor　speed　control　loop,　in　which　a　sliding　mode　control　(called　a　variable　speed　exponential　reaching　law)　is　used.　Through　simulation　study,　the　control　scheme　developed　here　can　make　the　motor　work　well,　which　means　it　can　be　used　in　some　EV　driving　systems.　©　(2011)　Trans　Tech　Publications.