Communication services are integrated. At a rotatable portion of the color wheel, such as the peripheral portion between the metal ring and the housing of the motor, or on the peripheral surface of the metal ring, a balancing groove with narrow opening and wider inside is formed thereon. The first data is one bit data represented by a combination of bits of the plurality of input signal lines. To enable the direct measurement, the employment of at least two sensor windings is needed each one mutually coupled with the stator phase of the motor.