SYNCHRONOUS MOTOR OPERATION

摘要

A synchronous motor is adjustably positioned on a support plate by screws passing through slots in the support plate. An optical filter is attached to an arm which is secured to the rotor of the motor for horizontal rotation of the arm between two stable positions defined by stops so that the filter is held stable either in or out of the path of a light beam in a spectrophotometer, for example. The stops are spaced and positioned in relation to the stator poles of the motor such that application to two stator coils of the motor of one or the other of two predetermined discrete voltage codes will unambiguously drive the rotor in the direction of a predetermined one or the other of the stops toward a stable pole position of the motor corresponding to that code until movement is terminated by that stop.