Motor drive control device, motor, and blower apparatus

A motor drive control device comprising:

• a drive control unit that controls driving of a motor unit to which a three-phase alternating current voltage is inputted and that switches an energization pattern to phase windings of the motor unit in a predetermined order;
• a current detection unit that detects a current value flowing through the motor unit;
• a storage unit that stores the current value detected by the current detection unit for each energization in the energization pattern;
• a voltage detection unit that detects a voltage of each of the phase windings;
• and
• a position information generation unit that generates rotational position information of a rotor of the motor unit in a rotational direction based on a detection result of the voltage detection unit,
• wherein in start-up operation of the motor unit, the drive control unit starts synchronized operation for switching the energization pattern according to the rotational position information when a second current value detected by the current detection unit at energization of a second or subsequent time in the energization pattern is smaller than a first current value detected by the current detection unit at energization of a first time in the energization pattern for m consecutive times, where m is a positive integer of two or more.