| 摘要 |
PURPOSE:To obtain constant rotary torque from a motor by merely performing the amplifying operation without vector synthesis in an output signal amplifying system of Hall elements and driving four exciting coils with sum or subtraction signal of the outputs of the Hall elements. CONSTITUTION:Four exciting coils 3a-3d are disposed on a stator at 6 pole field magnet, thereby forming a 6-pole 4-phase brushless motor. Both ends of the coil 3a are respectively connected to the output terminals (a), (b) of operational amplifiers A1, A2, both ends of the coil 3b are respectively connected to the output terminals (b), (c) of operational and inverting amplifiers A2, A3, both ends of the coil 3c are respectively connected to the output terminals (c), (d) of the inverting amplifiers A3, A4, and both ends of the coil 3d are respectively connected to the output terminals (d), (a) of inverting and the operational amplifiers A4, A1. The output signals of Hall elements H1, H2 are respectively inputted to the amplifiers A1, A2. In this manner, the constant rotary torque irrespective of the rotating angle of the field magnet can be obtained. |
