Motor control device and game machine

A game machine comprising:

• a game machine body;
• a movable body movably disposed on a front surface of the game machine body;
• a motor configured to drive the movable body;
• a rotation angle sensor configured to output a detection signal in every rotation of the motor at a predetermined angle;
• a motor control device configured to control the motor;
• and
• a presentation controller configured to control presentation in accordance with a state of a game,
• wherein
• the presentation controller generates a control command for defining a target rotation amount and a target rotation speed of the motor in accordance with the state of the game, and transmits the control command to the motor control device,
• the motor control device includes
• a communication interface configured to receive a control command from the presentation controller,
• a sensor interface configured to receive the detection signal from the rotation angle sensor,
• a controller configured to decide a set value of a rotation speed of the motor in accordance with the control command, and
• a drive signal generator configured to generate a drive signal for rotating the motor in accordance with the set value of the rotation speed, and configured to output the drive signal, and
• the controller of the motor control device calculates a total rotation amount of the motor from start of execution of the control command based on the number of the received detection signals, and determines occurrence or non-occurrence of an abnormality in operation of the motor based on at least any one of an update frequency of a minimum value of the difference between the target rotation amount and the total rotation amount and a non-update period when the minimum value of the difference is not updated.