| 摘要 |
PURPOSE:To correct off-set of an amplifier and to produce torque ripple, by providing three power arithmetic units where even power is set such that the sum of involution results are constant and an operating means having multiplying function arranged between a position detector and a control means. CONSTITUTION:Amplifiers 7, 8 incorporate operating means having multiplying function. Hole elements 1, 2 produce outputs proportional to magnetic fields phiu, phiv of a rotor magnet 3 and current fed from a power source 19. Outputs from the Hole elements 1, 2 are fed to output amplifiers 10, 11, an adder 9 and squaring units 13, 14. Gains of the amplifiers 7, 8 are controlled based on an output from an amplifier 18 so as to perform multiplication of an input signal and an output from the amplifier 18. Consequently, offset amount of the amplifiers 7, 8 is proportional to an amount fed back from the amplifier 18. As a result, torque ripple due to offset of the amplifiers 7, 8 can be suppressed. |
