A method and apparatus for limiting current and voltage in a PM electric machine comprising: receiving a command indicative of a desired position control; obtaining a velocity value indicative of the rotational velocity of the electric machine; and computing a first voltage threshold for the electric machine based on a selected operating condition. In one embodiment, the carrier assembly includes a head having a chamber, a magnetic field source carried by the head, and a fluid with magnetic elements in the chamber. A mask with a dopant implanting opening is formed on the second type substrate. The syringe barrel includes a biaxial stretch sidewall as a result of the blow molding process while the attachment mechanism remains essentially unchanged by the blow molding process.