Control apparatus for a pulse motor

Abstract

In a control apparatus for a pulse motor, both a smooth acceleration property and a stable constant speed operation characteristic are realized in a process wherein the motor starts to run and then is accelerated to enter a constant speed operating state. A target value for the rotor phase, and motor speeds at N different phase switching times during an acceleration period of the pulse motor are determined in advance. Then, phase control values (for conducting respective phase switchings when the rotor phase reaches the target phase of each phase switching) and speed control values (for conducting respective phase switchings so that the motor speed at each phase switching further approaches a target speed) are integrated with each other in accordance with a predetermined weighting function, and then executed. In an early stage of acceleration, the weight of the phase control predominates. As the motor speed increases, the speed control is weighted more and more heavily relative to the phase control. When the motor speed reaches the target speed for constant speed operation in a final stage of acceleration, only the phase control is once more conducted exclusively and only once, so that the rotor phase at a phase switching time is merged into the target phase switching phase, thereby achieving constant speed operation.

Dependencies are inferred from the claim text.