MOTOR DRIVE CONTROL APPARATUS

摘要

Disclosed is a motor drive control apparatus in which control of drive up to the high-speed drive region is achieved by a simple method in which the passage of current is controlled. The motor drive control apparatus repetitively performs a cycle of passage of current in the positive direction, turning the current off, passage of current in the negative direction and turning the current off, in respect of a three-phase bridge circuit, and performs current passage phase adjustment such that, when the passage of current is turned off, the terminal voltage can be inverted. During high-speed drive, if the desired rotational speed cannot be attained, control is performed such as to shorten the current passage time, by phase adjustment such that the terminal voltage is inverted immediately after passage of current has been turned off. In this way, the phase current can be advanced with respect to the actual applied voltage, making it possible to achieve high-speed rotation using a weak field magnet drive. Likewise, if a margin is available in respect of the voltage, by phase adjustment such that the terminal voltage is inverted immediately prior to turning the current on, thus adjusting the current passage time width so that the phase relationship of the time point of turning the current off and the time point of terminal voltage inversion is a desired relationship, optimisation of the applied voltage and current phase can be achieved, making it possible to achieve drive with maximum efficiency.