Abstract: A semiconductor device includes a semiconductor substrate having first and second main surfaces, first and second side surfaces opposite to each other in a first direction, and third and fourth side surfaces opposite to each other in a second direction perpendicular to the first direction, and a pattern structure disposed on the first main surface. The pattern structure within a first predetermined distance from the first side surface along the first direction and the pattern structure within the first predetermined distance from the second side surface along the first direction are symmetrical with respect to a line extending in the second direction. The pattern structure within a second predetermined distance from the third side surface along the second direction and the pattern structure within the second predetermined distance from the fourth side surface along the second direction are symmetrical with respect to a line extending in the first direction.

Abstract: A control apparatus includes a controller that controls a motor, a first transmission channel connected to a first power-supply terminal of an alternating-current source that supplies an alternating-current voltage, a second transmission channel connected to a second power-supply terminal of the alternating-current source, and a third transmission channel connected to each of the first transmission channel and the second transmission channel. The controller switches the rotational speed of the motor based on the voltage value of a signal input to the controller in accordance with a first connection status of the first transmission channel and the third transmission channel and a second connection status of the second transmission channel and the third transmission channel.

Abstract: A control apparatus includes a controller that controls a motor, a first transmission channel connected to a first power-supply terminal of an alternating-current source that supplies an alternating-current voltage, a second transmission channel connected to a second power-supply terminal of the alternating-current source, and a third transmission channel connected to each of the first transmission channel and the second transmission channel. The controller switches the rotational speed of the motor based on the voltage value of a signal input to the controller in accordance with a first connection status of the first transmission channel and the third transmission channel and a second connection status of the second transmission channel and the third transmission channel.