GB643986A - Improvements in or relating to automatic rotor-balancing apparatus - Google Patents
Improvements in or relating to automatic rotor-balancing apparatusInfo
- Publication number
- GB643986A GB643986A GB28275/46A GB2827546A GB643986A GB 643986 A GB643986 A GB 643986A GB 28275/46 A GB28275/46 A GB 28275/46A GB 2827546 A GB2827546 A GB 2827546A GB 643986 A GB643986 A GB 643986A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- speed
- relay
- switch
- amplifier
- 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
- 230000003068 static effect Effects 0.000 abstract 2
- 238000004804 winding Methods 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 229910052754 neon Inorganic materials 0.000 abstract 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
- G01C25/005—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass initial alignment, calibration or starting-up of inertial devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
- G01M1/22—Determining imbalance by oscillating or rotating the body to be tested and converting vibrations due to imbalance into electric variables
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing Of Balance (AREA)
Abstract
643,986. Automatic control systems. SPERRY GYROSCOPE CO., Inc. Sept. 20, 1946, No. 28275. Convention date, Sept. 20, 1945. [Class 38 (iv)] [Also in Groups XIX, XXIII and XXXVIII] Automatic rotor-balancing apparatus comprises means for rotating a rotor in a support at a predetermined speed, a pair of electrical pick-ups for producing signals from the vibration of the rotor and a pair of material-removers controlled by the said signals and arranged at or near the ends of the rotor. Piezo-electric crystal pick-ups 42, 42<SP>1</SP>, Fig. 6, arranged on opposite sides of the axle of the rotor 1 to be balanced, are connected one to a thermionic valve amplifier 45 and the other to two valves 43, 44 which are alternately biassed off by a relay 48 operated by a multivibrator 47. The outputs of the valves 43, 44 and 45 are connected to a mixer stage 46 in such a way that, when the valves 45 and 43 are operating, their outputs are combined in phase so that the oscillation of the rotor due to dynamic unbalance is measured and, when the valves 45 and 44 are operating, their outputs are combined in antiphase in order to measure the static unbalance. The stage 46 includes a phase-shifting circuit, which is initially adjusted for any one type of rotor, and the output from this stage is passed through a filter 57, a power amplifier 50 having automatic volume control, and a switch 51 to electromagnetically-controlled grinding plungers 521, 531 (see Group XXIII) arranged on diametrically opposite sides of the rotor, one at the top and one at the bottom. The switch 51, which is controlled by a multivibrator 55 synchronized with the multivibrator 47, causes the plungers 52<SP>1</SP>, 53<SP>1</SP> to operate simultaneously or in antiphase according to whether the relay 48 is set for measuring dynamic or static unbalance respectively. A meter and/or cathode-ray oscilloscope may be connected in the circuit before the filter 57 to indicate the amplitude and phase of the unbalance. The rotor field winding 5, Fig. 4, is energized by the depression of a push-button 6 which operates a switch 7 provided with a holding relay 8. The end of the rotor 1, Fig. 5, has a darkened sector so that a beam of light from a source 22, reflected by the rotor and received by a photoelectric cell 14 gives rise to a substantially square-wave output which is applied to the control grid of an amplifier valve 23, the screen grid of which is connected to a time-delay circuit incorporating a neon tube 24 so that the valve 23 does not conduct until a critical speed has been attained. After amplification by a valve 27, the signal from the photo-electric cell is applied directly, and through a circuit 30 which shifts its phase through 180 degrees at a critical frequency corresponding to the desired speed of rotation of the rotor, to a phasesensitive amplifier 28, the output of which is a D.C. voltage of one polarity or the other according to whether the speed of the rotor is above or below the desiredvalue. This D.C. voltage is connected, through a low-pass filter 34, to an amplifier 35, the output of which is connected to a speed-control relay 11<SP>1</SP> in series with the high-impedance coils 38, Fig. 4, of saturable reactors. The relay 11<SP>1</SP> operates, when the desired rotor speed is attained, to connect the rotor field winding 5 through the low-impedance coils 40 of the saturable reactors which thereafter maintain the rotor speed constant under the control of the D.C. voltage derived from the photo-electric cell. After two cycles in which no error signals arise due to unbalance, a trigger circuit 58, Fig. 6, operates the switch 7 to reverse the polarity of one of the three phases of the supply and thus to stop the rotor. A further circuit 59, not described, then releases the holding relay 8 for the switch 7.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US643986XA | 1945-09-20 | 1945-09-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB643986A true GB643986A (en) | 1950-10-04 |
Family
ID=22055684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28275/46A Expired GB643986A (en) | 1945-09-20 | 1946-09-20 | Improvements in or relating to automatic rotor-balancing apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB643986A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017773A (en) * | 1956-06-07 | 1962-01-23 | Gen Motors Corp | Balancing machine |
US3023613A (en) * | 1955-07-13 | 1962-03-06 | Internat Res & Dev Corp | Engine analyzer and balancer |
US3273293A (en) * | 1962-06-18 | 1966-09-20 | Sonderegger Hans Conrad | Device for balancing rotating bodies during operation |
DE1258144B (en) * | 1962-07-21 | 1968-01-04 | Reutlinger & Soehne Dr | Device for balancing rotating test specimens |
-
1946
- 1946-09-20 GB GB28275/46A patent/GB643986A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3023613A (en) * | 1955-07-13 | 1962-03-06 | Internat Res & Dev Corp | Engine analyzer and balancer |
US3017773A (en) * | 1956-06-07 | 1962-01-23 | Gen Motors Corp | Balancing machine |
US3273293A (en) * | 1962-06-18 | 1966-09-20 | Sonderegger Hans Conrad | Device for balancing rotating bodies during operation |
DE1258144B (en) * | 1962-07-21 | 1968-01-04 | Reutlinger & Soehne Dr | Device for balancing rotating test specimens |
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