| 摘要 |
PURPOSE:To permit speed control by detecting the speed of a motor from a total motor current by a method wherein the winding specification of either one of coils is made different from the winding specifications of other coils, in the multi-phase linear motor. CONSTITUTION:The movable block B of a linear motor is a 3-phase block, in which three pieces of electromagnets 8, consisting of a laminated core 2, coils 3 wound around the core 2, and a brush 4, contacted slidingly with a power supply substrate 5, to which one end of the coil 3 is connected, are arranged in series. Current is supplied to two phases among 3-phase coils 3a-3c and the movable block B is advanced by obtaining a thrust force in one given direction by a magnetomotive force generated upon conducting said two phases. In this case, the winding specification of the coil 3 of one-phase electromagnet 8 among 3-phase electromagnets 8a-8c is made different from the winding specifications of the coils 3 of the other electromagnets 8. According to this method, a change, indicating the advancing speed of a motor, may be generated in a total motor current and the advancing speed may be controlled by detecting the change. |
