| 摘要 |
PURPOSE:To form to enable to do rapid and smooth revolution and stoppage, by making brake signal to be obtained by detecting revolution speed of rotor. CONSTITUTION:Revolution speed of rotor 2 or revolution speed of turn table 1 is detected by pick up coil 18, and according to the strength of detecting signal, braking power which is corresponded to revolution number can be obtained by electromagnet brake device. Above-mentioned electro-magnet brake device is composed of the pick up coil 18, first and second amplifying circuits 21,22, first, second, and third switching diodes 23-25, first, second, and third driving circuits 8-10, first, second and third stator coils 5-7, brake switch 26 and bias circuit 27. |
