| 摘要 |
PURPOSE:To make it possible to estimate even the quick load torque fluctuation by estimating the load torque by the use of the torque produced by the motor as well as time required for every one bit change which the output signal of the digital type location detector brings about. CONSTITUTION:A single stable circuit 10 strikes a square wave signal Pw having a width W in inverse proportion to the output (speed estimated value) N of an integrating circuit 9 in every input of the trigger pulse P. By a voltage conversion circuit 11 the square wave signal Pw is converted into the square wave signal Qw turning to -A when the signal Pw is at '1' level and to +A when the signal Pw is at '0' level. The square wave signal Qw is increased KA times by the coefficient circuit 12, becoming a negative input to the integrating circuit 9. Moreover, the square wave signal Qw is smoothed by the filter composed of the first-order lag elements and becomes a load torque estimated value TAUL. |
