Motor driving control device and motor driving control method

A motor driving control device comprising:

• a motor driving unit having a plurality of switching elements connected to a power supply and configured to selectively energize coils with a plurality of phases of a motor;
• a position detector corresponding to any one of the plurality of phases and configured to output a position signal, a phase of the position signal changing depending on a position of a rotor of the motor;
• a current detector configured to detect a drive current of the motor;
• and
• a control unit configured to output a drive control signal for operating the plurality of switching elements to the motor driving unit, wherein
• the control unit includes
• a change detecting means configured to detect a predetermined phase change in the position signal,
• a first switching means configured to sequentially switch energization patterns of the coils with the plurality of phases based on a timing when the phase change is detected, and
• a second switching means configured to, in a state where the change detecting means does not detect the phase change, when a value of the drive current becomes a predetermined first threshold or more during a monitoring time period after a timing when the predetermined phase change in the position signal is expected, perform an operation to forcibly switch to a next energization pattern regardless of the timing of switching the energization pattern by the first switching means.