SHIFT RANGE SWITCHING APPARATUS

The present invention provides a shift range switching apparatus in which the actual rotation angle position can be caused to converge on the target rotation angle position with improved stability and inexpensive cost. The shift range switching apparatus in accordance with the invention includes: a first control pattern in which the energization phase is switched on every switching of the pulse signals of the motor rotational position sensor, and a second control pattern in which, even when a switching timing of the energization phase due to the switching of the pulse signals of the motor rotational position sensor exists, the energization phase is not switched at least during a predetermined period longer than the switching period of the pulse signals of the motor rotational position sensor, wherein in an acceleration period before a specific position in which the actual rotation angle position of the detent plate is going toward the target rotation angle position and then the rotation of the three-phase motor becomes stable, the energization phase is switched with the first control pattern set, then, in a deceleration period after the specific position in which the rotation of the three-phase motor is stable and then the actual rotation angle position generally matches the target rotation angle position, the energization phase is switched with the second control pattern set.