Motor control device

A motor control device for controlling a motor of a flying object that takes off from a ground and flies, the motor control device comprising:

• a step-down device which receives DC power supplied from a DC distribution network as input power and outputs DC power having voltage equal to or smaller than distribution network voltage of the DC distribution network;
• a power supply device which converts the DC power to AC power and outputs the AC power to the motor;
• and
• a control device for controlling the step-down device and the power supply device, wherein
• the step-down device includes a DC-output power conversion device which converts the input power to DC power having voltage equal to or smaller than the distribution network voltage of the DC distribution network, and an output capacitor for smoothing output voltage of the DC-output power conversion device,
• the DC-output power conversion device has a first operation mode for outputting first voltage and a second operation mode for outputting second voltage lower than the first voltage,
• when the flying object takes off from the ground, the control device controls the DC-output power conversion device in the first operation mode, and
• when the control device judges that flight information which is one or both of information of a motor parameter obtained along with control for the motor and information of an environmental factor relevant to a flight altitude of the flying object satisfies a predetermined condition, or when the control device has received an operation mode signal for which the second operation mode is selected on the basis of the flight information during control for the motor, the control device controls the DC-output power conversion device in the second operation mode.