MOTOR WITH FREQUENCY GENERATOR

摘要

PURPOSE:To obtain a rotary speed signal of large output by disposing the first and second generating coils between a rotor section and a stator section and adding the both outputs. CONSTITUTION:The first generating coil 8a is arranged at the position opposed to the slot formed on a rotor between a rotor section and a stator section. The second generating coil 8b is arranged at the position opposed to a multipolar magnet between the rotor section and the stator section. A current induced by a magnetic field generated by flowing a drive current to a drive coil becomes in reverse phase between the first coil 8a and the second coil 8b to cancel to each other, and a current induced as a rotating speed signal is in phase between the first coil 8a and the second coil 8b.