Electricity: motive power systems – Positional servo systems
Patent
1988-12-09
1990-02-20
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
318615, 318616, 318618, 3644241, 360 7306, 360 7308, G05B 1300
Patent
active
049029460
ABSTRACT:
A servo circuit controls the rotation of a drum motor to rotate a rotary head drum having a frequency generating circuit for generating a frequency signal corresponding to the revolution speed of a drum motor, a cycle detector circuit detects a cycle of the frequency signal from the frequency generating circuit, and a detector circuit speed deviation between a detected signal from the detector circuit and a reference signal to produce a first circuit generates speed deviation signal, a first circuit for generating a first circuit generates first rotation control signal based on the speed deviation signal, and a second circuit produces a second rotation control signal based on phase difference data obtained by integrating the speed deviation signal. An adder circuit adds the first and second rotation control signals to produce a rotation control signal which is supplied to the drum motor to stably rotate the rotary head drum.
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Dowden Donald S.
Eslinger Lewis H.
Ip Paul
Maioli Jay H.
Shoop Jr. William M.
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