Cart

A cart comprising:

• a driving wheel;
• a motor configured to rotate the driving wheel;
• a motor drive circuit configured to control supply of electric power to the motor;
• a motor control device configured to control the motor via the motor drive circuit;
• a switching element arranged on an electric power supply path to the motor drive circuit;
• a switch circuit arranged separately from the motor control device and configured to switch the switching element between a conduction state and a non-conduction state;
• an operation member arranged on the cart and configured to be operated by a user;
• an electromagnetic brake configured to mechanically brake the motor;
• and
• an electromagnetic brake drive circuit configured to control supply of electric power to the electromagnetic brake, wherein
• the cart is configured to operate in a manual mode and an automatic mode,
• in the manual mode, the motor is driven when the operation member is on and the motor is stopped when the operation member is off,
• in the automatic mode, the motor is driven regardless of whether the operation member is on or off, and
• a signal that instructs the switching element to switch from the conduction state to the non-conduction state is inputted to the electromagnetic brake drive circuit via a delay circuit so that, when the switching element is switched from the conduction state to the non-conduction state, the electromagnetic brake brakes the motor at a timing later than a timing at which the switching element is switched from the conduction state to the non-conduction state.

A cart comprising:

• a driving wheel;
• a motor configured to rotate the driving wheel;
• a motor drive circuit configured to control supply of electric power to the motor;
• a motor control device configured to control the motor via the motor drive circuit;
• a switching element arranged on an electric power supply path to the motor drive circuit;
• a switch circuit arranged separately from the motor control device and configured to switch the switching element between a conduction state and a non-conduction state;
• an operation member arranged on the cart and configured to be operated by a user;
• an electromagnetic brake configured to mechanically brake the motor;
• an electromagnetic brake drive circuit configured to control supply of electric power to the electromagnetic brake;
• and
• a motor brake circuit including a resister and configured to electrically brake the motor by flowing a current from the motor drive circuit to the resister while the motor is rotating, wherein
• the cart is configured to operate in a manual mode and an automatic mode,
• in the manual mode, the motor is driven when the operation member is on and the motor is stopped when the operation member is off,
• in the automatic mode, the motor is driven regardless of whether the operation member is on or off, and
• the motor brake circuit brakes the motor at a timing earlier than a timing at which the electromagnetic brake brakes the motor.