GB927798A - Speed regulating apparatus for recording media - Google Patents
Speed regulating apparatus for recording mediaInfo
- Publication number
- GB927798A GB927798A GB927798DA GB927798A GB 927798 A GB927798 A GB 927798A GB 927798D A GB927798D A GB 927798DA GB 927798 A GB927798 A GB 927798A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- amplifier
- speed
- capstan
- tachometer
- 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
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/416—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control of velocity, acceleration or deceleration
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Velocity Or Acceleration (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
927,798. Automatic speed control systems. MINNESOTA MINING & MANUFACTURING CO. Feb. 2, 1960, No. 3719/60. Class 38 (4). A magnetic tape 1 is driven by capstan 3 coupled to an eddy-current brake-drum 11 which co-operates with electromagnetic coil 15, the variation in capacity between plate 19 and the drum, which is provided with holes 17, affording an indication of the speed of the capstan since any variation in speed is reflected by variations in frequency of the voltage developed across resistor 23. The drum 11 also serves as a pulley through which the capstan is driven by an induction motor 29. During the recording operation, the tachometer is connected through a high-gain amplifier and limiter 35 to a frequency discriminator 39 feeding a detector 41, and thence through a D.C. amplifier 43 supplying a control voltage to magnetic amplifier 31. The amplifier has sufficient power to start the motor so that the tachometer provides an error voltage which increases the torque of the motor and brings it up to speed. As synchronism is approached, the output from detector 41 decreases and a second feedback loop takes over control. In this loop, the output from amplifier 35 is fed to a phase discriminator 47 which compares the tachometer frequency with a standard frequency from generator 49 and divider 51, so developing an error signal which varies in magnitude and sign with discrepancies in phase between the two input signals. The resultant signal is applied to amplifier 43 and overrides the signal from the first feedback loop when the motor approaches its desired speed. The discriminator 47 also supplies a differentiating circuit 55 whose phase-advanced output is supplied to brake-coil 15 through driver 57. The standard frequency signal from the divider 51 is supplied to head 9, thus imposing a record of the standard frequency signal on the tape. During play-back, the comparison frequency is derived from the tape instead of from the tachometer. In another arrangement, a synchronous motor driving the capstan is supplied from a power oscillator the frequency of which is controlled by a reactance tube receiving the error signal from the phase discriminator, Fig. 2 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB927798T | 1960-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB927798A true GB927798A (en) | 1963-06-06 |
Family
ID=32982835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB927798D Expired GB927798A (en) | 1960-02-02 | 1960-02-02 | Speed regulating apparatus for recording media |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB927798A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4904917A (en) * | 1986-08-29 | 1990-02-27 | Rank Pullin Controls Limited | Drive apparatus |
-
1960
- 1960-02-02 GB GB927798D patent/GB927798A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4904917A (en) * | 1986-08-29 | 1990-02-27 | Rank Pullin Controls Limited | Drive apparatus |
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