Motor control unit and electric pump unit

A motor control unit that controls, based on hydraulic pressure, an electric motor that drives a pump that sucks in and discharges oil, comprising:

• a control circuit that includes a control signal output unit that outputs a motor control signal;
• and
• a drive circuit that is actuated upon reception of the motor control signal, and that supplies driving electric power to the electric motor, wherein,
• the control circuit further includes an over-power suppression control unit that suppresses over power by reducing a current command value from a host control unit,
• the control signal output unit obtains the motor control signal by applying a reduction amount for the current command value, which is obtained by the over-power suppression control unit, to the current command value from the host control unit,
• the over-power suppression control unit includes a current command value correction amount calculation unit that compares a target hydraulic pressure with a present hydraulic pressure and outputs the current command value reduction amount for over-power suppression control when the present hydraulic pressure is higher than the target hydraulic pressure, and
• load information indicating whether a load on the pump is a low load or a high load that is higher than the low load is input into the control circuit from the host control unit, and the over-power suppression control unit changes the target hydraulic pressure in accordance with a magnitude of the load indicated by the load information.