| 摘要 |
PURPOSE:To accurately control the speed of a 3-phase tachometer generator by leading out the most desirable part of a waveform of a counterelectromotive force obtained by a generating coil. CONSTITUTION:A 3-phase tachometer generator 1 has an axial gap structure and a coreless structure. Bearings 3, 4 are provided substantially at the centers on both upper and lower surfaces of an axially flat 3-phase tachometer generator body 2, and a rotor yoke 6 is secured through a coupling member 7 to a rotational shaft 5. A dipole magnet rotor 8 being magnetized in axial orientation is secured to the lower surface of the yoke 6, and arranged face-to-face to a stator 10 through an air gap 9. The stator 10 has generating coils 12, 13 and a magnetic sensor. An ideal counterelectromotive force waveform part wherein the counterelectromotive force waveforms from the coils 12, 13 coincide with a pole detection signal from the sensor is led out as a tachometer generator signal. |
