| 摘要 |
An optical excitation electromagnet brushless motor comprises a stator having at least two angularly separated stator coils; a transistorized amplifier connected to the stator coils and connectable to a power source for exciting the stator coils when the amplifier is activated; a rotor rotatably mounted about an axis with respect to the stator and carrying at least two angularly spaced rotor magnets each for generating a permanent magnetic field for interaction with magnetic fields generated by the stator coils when energized by the amplifier to cause rotation of the rotor about the axis; a disc mounted for rotation with the rotor and having at least one port therein extending radially on the disc with respect to the axis and rotatable about the axis, the port being at a selected angular position with respect to the rotor magnets; an arm mounted for radial movement with respect to the disc; a light transmitter and a light receiver mounted on the arm on opposite sides of the disc for the passage of light from the transmitter to the receiver through the port when the port passes between the light transmitter and light receiver, the light receiver being connected to the transistorized amplifier for energizing the transistorized amplifier when receiving light from the light transmitter through the port, a speed of rotation of the rotor being determined by a radial position of the arm with respect to the axis and a direction of rotation of the rotor being determined by an angular position of the port with respect to the rotor magnets. |
