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Variable Rate Servomotor Drive

IP.com Disclosure Number: IPCOM000089987D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

McGill, GN: AUTHOR

Abstract

A variable servosystem drive rate is realized with AC frequency responsive motor 10 and an operating power source comprising variable frequency sine-wave oscillator 12 followed by high-gain power amplifier 14. Oscillator 12 comprises transistors 16 and 18 connected in a regenerative feedback arrangement having a twin-bridged T-filter circuit 20 for the frequency determining element. The frequency of operation is altered by changing the value of the shunt resistance element of filter 20 between the circuit points 22 and 24. This is accomplished in discrete steps by switch 26 and a multiple of resistor combinations, each having fixed element 28 and trimming element 29.

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Variable Rate Servomotor Drive

A variable servosystem drive rate is realized with AC frequency responsive motor 10 and an operating power source comprising variable frequency sine- wave oscillator 12 followed by high-gain power amplifier 14. Oscillator 12 comprises transistors 16 and 18 connected in a regenerative feedback arrangement having a twin-bridged T-filter circuit 20 for the frequency determining element. The frequency of operation is altered by changing the value of the shunt resistance element of filter 20 between the circuit points 22 and 24. This is accomplished in discrete steps by switch 26 and a multiple of resistor combinations, each having fixed element 28 and trimming element 29. Amplifier 14 has transistors 32 and 34 in a single-ended input stage, transistors 36, 37, and 38 in a paraphrase intermediate stage, and power transistors 42 and 44 in a complementary type output stage. The overall gain is adjusted in the input circuit by series rheostat 46. Resistor 48 forms a negative feedback path from output load resistors 52 and 54 to the input stage at the base of transistor
32. Synchronous motor 10 provides sufficient power output between frequencies one-third and one and one-half times the rated frequency.

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