초록 ▼

A main feedback system regulates an output parameter of interest, such as velocity, versus a given range of load parameters, such as torque and inertia. An element feedback system rapidly adjusts an in-series-path zero to frequency track (cancel) a varying load-caused pole－including in-range variati

A main feedback system regulates an output parameter of interest, such as velocity, versus a given range of load parameters, such as torque and inertia. An element feedback system rapidly adjusts an in-series-path zero to frequency track (cancel) a varying load-caused pole－including in-range variations of 100:1. Since zero-setting is inverse to an adjusted resistance required, a 100:1 zero range causes a highly non-linear resistance transmission, affecting the element loop\s gain but not that of the main control feedback loop. By introducing a variable resistance of the same value as used in the main feedback system as a divider in the element feedback loop only, the element loop gain is made substantially constant over the entire pole-tracking range, and the element loop\s bandwidth is made substantially constant over the same range, and thus rendering the dynamic response substantially constant over the same range. To avoid differential temperature effects on the same-value resistances, both are referenced to a common heat sink.

대표청구항 ▼

A feedback control system for controlling a parameter of a load element by a first feedback loop, said load element having a dynamic response producing an output signal which varies non-linearly over an operating frequency range, said system comprising: means for generating a first feedback signal f

A feedback control system for controlling a parameter of a load element by a first feedback loop, said load element having a dynamic response producing an output signal which varies non-linearly over an operating frequency range, said system comprising: means for generating a first feedback signal from the output signal to form said first feedback loop, said first feedback signal corresponding to the difference between a desired value and an actual value of the parameter; means for compensating said first feedback signal for variations in said load element\s dynamic response, said compensating means coupled to said first feedback loop and comprising a first variable resistance means and a capacitive means, the first variable resistance means defining a resistance; means for generating an element feedback signal coupled to said compensating means for causing said compensated first feedback signal to vary directly with variations in frequency response of said load element so as to generate a “zero”to track and substantially cancel a “pole”of the dynamic response of said load element; and wherein said element feedback signal generating means comprises a second variable resistance means for defining a resistance substantially equal to the resistance defined by said first variable resistance means so as to maintain loop-gain and bandwidth of the first feedback loop generally constant over the operating frequency range.