GB1240938A - Dc motor servo system - Google Patents

Dc motor servo system

Info

Publication number
GB1240938A
GB1240938A GB1332369A GB1332369A GB1240938A GB 1240938 A GB1240938 A GB 1240938A GB 1332369 A GB1332369 A GB 1332369A GB 1332369 A GB1332369 A GB 1332369A GB 1240938 A GB1240938 A GB 1240938A
Authority
GB
United Kingdom
Prior art keywords
signal
motor
speed
pulse
phase error
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1332369A
Inventor
Kazunobu Tsujikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1994768U external-priority patent/JPS4530914Y1/ja
Application filed by Sony Corp filed Critical Sony Corp
Publication of GB1240938A publication Critical patent/GB1240938A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • G05D3/14—Control of position or direction using feedback using an analogue comparing device
    • G05D3/18—Control of position or direction using feedback using an analogue comparing device delivering a series of pulses
    • G05D3/186—Control of position or direction using feedback using an analogue comparing device delivering a series of pulses using clutch or brake
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
    • H02P7/2913—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording

Abstract

1,240,938. Automatic speed control. SONY CORP. March 13, 1969 [March 13, 1968; March 14, 1968], No.13323/69. Heading G3R. A D.C. motor 5 drives a tachogenerator 13, the output of which is used to regulate the speed of the motor, and a pulse generator 15, whose output is indicative of the phase of motor shaft and is phase compared with a reference signal S2 to provide a phase error signal which is then used to modify the speed regulator so as to maintain synchronism between the motor shaft and the reference signal S2. The tachogenerator 13 is in the form of a toothed magnetic wheel and pick-up Fig. 1 (not shown) and delivers a signal whose frequency depends on the speed of the motor. This signal is applied to a limiter 25 and then to a demodulator 26 in the form of a low-pass filter; this delivers an A. C. signal S 1 whose amplitude varies with the speed. The signal S 1 is clamped by a diode 28 to a set D.C. level V 0 and applied to a circuit 21 which passes only that part of the signal above a fixed voltage level V. The resultant signal is amplifed and applied to the motor 5. If the motor speed rises the amplitude of signal S 1 <SP>11</SP> falls and less energy is supplied to the motor. The pulse generator is in the form of a magnet rotating with the motor shaft to give a pulse once per revolution in the pick-up 15. The reference pulses S2 are integrated in a Miller circuit 31 to provide a repetitive ramp waveform which is applied to a gate 38 controlled by the pulses S5 from generator 15. The gate 38 samples the ramp waveform and thus delivers to a capacitor 39 a signal whose amplitude varies with the phase error. This is filtered and used to adjust the clamping level V 0 of diode 28. If phase error increases V 0 <SP>1</SP> increases and more energy is supplied to the motor 5. In an alternative embodiment Figs. 5, 6 (not shown) the speed signal, squared by a bi-stable circuit, is applied to a monostable circuit, the input and output of which are compared in an AND gate to give a pulse signal whose pulse with varies with the speed error. The phase error signal S 6 is used to vary the time constant of the monostable so that the pulse width also depends on phase error. The reference signal S 2 may be the vertical synchronizing pulses of a video signal to be recorded on an oblique scan tape recorder driven by the D.C. motor 5.
GB1332369A 1968-03-13 1969-03-13 Dc motor servo system Expired GB1240938A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1628368 1968-03-13
JP1994768U JPS4530914Y1 (en) 1968-03-14 1968-03-14

Publications (1)

Publication Number Publication Date
GB1240938A true GB1240938A (en) 1971-07-28

Family

ID=26352587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1332369A Expired GB1240938A (en) 1968-03-13 1969-03-13 Dc motor servo system

Country Status (4)

Country Link
DE (1) DE1912834A1 (en)
FR (1) FR2003830A1 (en)
GB (1) GB1240938A (en)
NL (1) NL168675C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524013Y2 (en) * 1972-09-29 1977-01-27

Also Published As

Publication number Publication date
FR2003830A1 (en) 1969-11-14
NL168675C (en) 1982-04-16
NL6903878A (en) 1969-09-16
DE1912834A1 (en) 1969-10-16
NL168675B (en) 1981-11-16

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Legal Events

Date Code Title Description
PS Patent sealed