GB2127549A - Measuring and recording system for steady-state and transient torques - Google Patents

Measuring and recording system for steady-state and transient torques Download PDF

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Publication number
GB2127549A
GB2127549A GB08226334A GB8226334A GB2127549A GB 2127549 A GB2127549 A GB 2127549A GB 08226334 A GB08226334 A GB 08226334A GB 8226334 A GB8226334 A GB 8226334A GB 2127549 A GB2127549 A GB 2127549A
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United Kingdom
Prior art keywords
motor
torque
speed
measuring
load
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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.)
Withdrawn
Application number
GB08226334A
Inventor
Wai Sun Leung
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Individual
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Individual
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Publication date
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Priority to GB08226334A priority Critical patent/GB2127549A/en
Publication of GB2127549A publication Critical patent/GB2127549A/en
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/14—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft
    • G01L3/1478—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving hinged levers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
    • G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
    • G01M15/044—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring power, e.g. by operating the engine with one of the ignitions interrupted; by using acceleration tests

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The system consists of a test bed on which the motor on test is supported by bearings at both ends of its shaft such that the frame (including the stator) of the motor is free of swing. When the motor is energised, its torque, whether stationary or rotational, is transmitted to the frame which tends to swing. The frame is held stationary by a transducer which senses the torque of the motor. The signal of the transducer is fed via an electrical measurement bridge and amplifier(s) to analogue and/or digital voltmeters which are calibrated to measure the torque directly. A tachometer, a variable load, and if necessary a flywheel, are mechanically coupled to the motor. The signal of the tachometer, which senses the speed of the motor, can be fed via amplifier(s) to voltage measuring or recording instruments. When the torque and speed measurements of a motor are taken simultaneously on a cathode ray oscilloscope or an X-Y recorder, the transient torque of the motor from zero speed to full speed can be measured and recorded.

Description

SPECIFICATION Measuring and recording system for steadystate and transient torques The invention is a measuring and recording system for steady-state and transient torques of prime movers such as motors and engines. For simplicity, the prime mover is hitherto referred to as a motor. Fig. 1 shows the block diagram of the system for measuring and recording torque and speed. Their electrical signals obtained from the torque and speed transducers respectively can be displayed in the voltmeters or the C.R.O. and X-Y plotter. While in the conventional torque measuring equipment, the motor is, without exception, mechanically secured onto the test bed, in the invention, the motor is supported on its shaft by bearings A which are mounted on the test bed B as shown in Fig. 2.In the invention, the frame (including the stator) of the motor C is free to swing whereas in the conventional equipment, the frame of the motor is rigidly held to the test bed and is unable to swing. In order to accommodate motors of different sizes, the motor shaft is held by a mechanism such as the chuck D and the slidable tailpiece E of a lathe. When the motor is energised either under starting or running conditions, the motor frame is subjected to a torque equal and opposite to the motor generated torque. The motor frame is prevented from swinging by a strain gauge transducer F which senses the motor torque. The signal from the transducer is amplified and displayed on a digital and/or analogue voltmeters. The load G of the motor can be in the form of a mechanical brake load, a fan, an eddy-current brake load or a generator.A tachometer H is coupled to the motor to measure its speed and the tachometer output can be amplified and displayed on digital or analogue voltmeters if speed measurement is also required. The transient torque-time and speed-time characteristics of the motor can be recorded on a C.R.O. with a memory or on an X-Y plotter with a time base. The transient torquespeed characteristics of the motor can also be recorded on the C.R.O. or the X-Y plotter by feeding the amplified tachometer signal to the time axis of the C.R.O. or to the X axis of the X-Y plotter. To record the transient torque-speed characteristics of a motor starting from zero speed to full speed, it may be necessary to provide the motor with an additional flywheel I of sufficient inertia to reduce the acceleration of the motor.
Special features 1. In the invention, the shaft of the motor on test is supported on bearings mounted on the test bed unlike the conventional torque measuring device.
2. In the invention, the motor frame is held by the transducer and is otherwise free to swing unlike the conventional torque measuring device.
3. In the invention, the measurement of torque is taken at the motor itself unlike the case of the conventional torque measuring device which measures the torque at the load or at the coupling to the load.
4. As a result of (3) above, the torque measured in the invention is the torque developed in the motor rather than the load torque as in the case of the conventional torque measuring torque.
Claims
1. A measuring and recording system for the torque developed in prime movers such as motors and engines complete with a tachometer so that the starting transient and running torques of the primer mover (say, motor) can be measured, amplified, displayed and recorded in relation to time and speed thus producing the torque-time and torque-speed characteristics of the primer mover (say, motor).
2. An invention as described in Claim 1 which has a test bed on which there are bearings for supporting the primer mover (say, motor) whose torque is to be measured such that the frame or casing of the primer mover (say, motor) is free to swing, but is held stationary by a transducer for measuring the force (and hence the torque) of the prime mover (say, motor).
3. An invention as described in Claim 1 with the test bed as described in Claim 2 in which (a) the distance between the said bearings as adjustable in order that they can support prime movers (say, motors) of different sizes within a range; (b) a mechanism (such as the chuck and the tail-piece of a lathe), is provided for supporting the primer mover (say, motor) on its shaft and (c) a variable load and if necessary a flywheel are coupled to the shaft of the prime mover (say, motor) for adjusting the torque and acceleration of the prime mover (say, motor).
4. An invention as described in Claim 1 which measures and records the instantaneous torque developed in the prime mover (say, motor) rather than the load torque which is the quality measured by a conventional torque measuring device.
New claims or amendments to claims filed on 14th March 1983 Superseded claims 1-4 New or amended claims: 1. A mechanical arrangement for testing the torque and output of a motor wherein the motor is mounted in a cage hung from the ceiling or the top of a table through two shafts fitted to above and down a bearing (for a heavy motor, a thrust bearing is required) such that the lower shaft, which is fixed to the cage and hence the motor frame, is prevented from turning relative to the upper shaft which is fixed to the ceiling, by a bar on which the torque sensor is adhered to.
2. A measuring and recording system for the torque and power of a motor and its load
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Measuring and recording system for steadystate and transient torques The invention is a measuring and recording system for steady-state and transient torques of prime movers such as motors and engines. For simplicity, the prime mover is hitherto referred to as a motor. Fig. 1 shows the block diagram of the system for measuring and recording torque and speed. Their electrical signals obtained from the torque and speed transducers respectively can be displayed in the voltmeters or the C.R.O. and X-Y plotter. While in the conventional torque measuring equipment, the motor is, without exception, mechanically secured onto the test bed, in the invention, the motor is supported on its shaft by bearings A which are mounted on the test bed B as shown in Fig. 2.In the invention, the frame (including the stator) of the motor C is free to swing whereas in the conventional equipment, the frame of the motor is rigidly held to the test bed and is unable to swing. In order to accommodate motors of different sizes, the motor shaft is held by a mechanism such as the chuck D and the slidable tailpiece E of a lathe. When the motor is energised either under starting or running conditions, the motor frame is subjected to a torque equal and opposite to the motor generated torque. The motor frame is prevented from swinging by a strain gauge transducer F which senses the motor torque. The signal from the transducer is amplified and displayed on a digital and/or analogue voltmeters. The load G of the motor can be in the form of a mechanical brake load, a fan, an eddy-current brake load or a generator.A tachometer H is coupled to the motor to measure its speed and the tachometer output can be amplified and displayed on digital or analogue voltmeters if speed measurement is also required. The transient torque-time and speed-time characteristics of the motor can be recorded on a C.R.O. with a memory or on an X-Y plotter with a time base. The transient torquespeed characteristics of the motor can also be recorded on the C.R.O. or the X-Y plotter by feeding the amplified tachometer signal to the time axis of the C.R.O. or to the X axis of the X-Y plotter. To record the transient torque-speed characteristics of a motor starting from zero speed to full speed, it may be necessary to provide the motor with an additional flywheel I of sufficient inertia to reduce the acceleration of the motor. Special features 1. In the invention, the shaft of the motor on test is supported on bearings mounted on the test bed unlike the conventional torque measuring device. 2. In the invention, the motor frame is held by the transducer and is otherwise free to swing unlike the conventional torque measuring device. 3. In the invention, the measurement of torque is taken at the motor itself unlike the case of the conventional torque measuring device which measures the torque at the load or at the coupling to the load. 4. As a result of (3) above, the torque measured in the invention is the torque developed in the motor rather than the load torque as in the case of the conventional torque measuring torque. Claims
1. A measuring and recording system for the torque developed in prime movers such as motors and engines complete with a tachometer so that the starting transient and running torques of the primer mover (say, motor) can be measured, amplified, displayed and recorded in relation to time and speed thus producing the torque-time and torque-speed characteristics of the primer mover (say, motor).
2. An invention as described in Claim 1 which has a test bed on which there are bearings for supporting the primer mover (say, motor) whose torque is to be measured such that the frame or casing of the primer mover (say, motor) is free to swing, but is held stationary by a transducer for measuring the force (and hence the torque) of the prime mover (say, motor).
3. A torque measuring and recording system as described in Claims 1 and 2 wherein the position of the bar which accommodates the torque sensor can be altered so as to measure the torque in both the clockwise and anti-clockwise directions.
3. An invention as described in Claim 1 with the test bed as described in Claim 2 in which (a) the distance between the said bearings as adjustable in order that they can support prime movers (say, motors) of different sizes within a range; (b) a mechanism (such as the chuck and the tail-piece of a lathe), is provided for supporting the primer mover (say, motor) on its shaft and (c) a variable load and if necessary a flywheel are coupled to the shaft of the prime mover (say, motor) for adjusting the torque and acceleration of the prime mover (say, motor).
4. An invention as described in Claim 1 which measures and records the instantaneous torque developed in the prime mover (say, motor) rather than the load torque which is the quality measured by a conventional torque measuring device.
New claims or amendments to claims filed on 14th March 1983 Superseded claims 1-4 New or amended claims:
1. A mechanical arrangement for testing the torque and output of a motor wherein the motor is mounted in a cage hung from the ceiling or the top of a table through two shafts fitted to above and down a bearing (for a heavy motor, a thrust bearing is required) such that the lower shaft, which is fixed to the cage and hence the motor frame, is prevented from turning relative to the upper shaft which is fixed to the ceiling, by a bar on which the torque sensor is adhered to.
2. A measuring and recording system for the torque and power of a motor and its load incorporating the mechanical arrangements for mounting the motor and sensing its torque as described in Claim 1 wherein a tachogenerator is coupled to the motor so that the transient and running torques of the motor and load can be measured, amplified, displayed and recorded in relation to time and speed thus producing the torque-time and torque-speed characteristics and that through an electronic multiplier the output power of the motor can also be read in a voltmeter designated as a horsepower meter.
GB08226334A 1982-09-16 1982-09-16 Measuring and recording system for steady-state and transient torques Withdrawn GB2127549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08226334A GB2127549A (en) 1982-09-16 1982-09-16 Measuring and recording system for steady-state and transient torques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08226334A GB2127549A (en) 1982-09-16 1982-09-16 Measuring and recording system for steady-state and transient torques

Publications (1)

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GB2127549A true GB2127549A (en) 1984-04-11

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197956A (en) * 1986-11-19 1988-06-02 Wai Sun Leung Motor torque measuring and recording system
EP0590187A1 (en) * 1992-09-30 1994-04-06 Carl Schenck Ag Device for mass flow measurement
EP0612991A1 (en) * 1993-02-25 1994-08-31 Daniel Fuchs Device for measuring torque between a motor assembly and a load assembly
FR2747986A1 (en) * 1996-04-29 1997-10-31 Sncf Torque sensing device for railway shunting operating motor
WO1999066335A1 (en) * 1998-06-16 1999-12-23 M.E.A. Motor Inspection Ltd. Method and system for performance testing of rotating machines
CN101793576A (en) * 2010-04-08 2010-08-04 陈苏琦 Measurement method of electric motor load torque and application thereof
CN101726377B (en) * 2009-12-17 2011-08-31 东方电气集团东方汽轮机有限公司 Wind driven generator coupler test-bed and test method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB997723A (en) * 1962-08-09 1965-07-07 Licentia Gmbh Torque indicating means for rotary members
GB1349713A (en) * 1970-03-31 1974-04-10 Suntester Ltd Vehicle testing apparatus
GB1386559A (en) * 1972-04-10 1975-03-05 Deere & Co Fuel weighing system
GB2072344A (en) * 1980-03-20 1981-09-30 Rueegg W A Method and Apparatus for Measuring the Driving Torque of a Driving System
GB2075196A (en) * 1980-03-26 1981-11-11 Ass Elect Ind Machine shaft torque measurement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB997723A (en) * 1962-08-09 1965-07-07 Licentia Gmbh Torque indicating means for rotary members
GB1349713A (en) * 1970-03-31 1974-04-10 Suntester Ltd Vehicle testing apparatus
GB1386559A (en) * 1972-04-10 1975-03-05 Deere & Co Fuel weighing system
GB2072344A (en) * 1980-03-20 1981-09-30 Rueegg W A Method and Apparatus for Measuring the Driving Torque of a Driving System
GB2075196A (en) * 1980-03-26 1981-11-11 Ass Elect Ind Machine shaft torque measurement

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197956A (en) * 1986-11-19 1988-06-02 Wai Sun Leung Motor torque measuring and recording system
EP0590187A1 (en) * 1992-09-30 1994-04-06 Carl Schenck Ag Device for mass flow measurement
US5353647A (en) * 1992-09-30 1994-10-11 Carl Schenck Ag Apparatus for measuring Coriolis forces for ascertaining a mass flow, especially a bulk material flow
EP0612991A1 (en) * 1993-02-25 1994-08-31 Daniel Fuchs Device for measuring torque between a motor assembly and a load assembly
FR2747986A1 (en) * 1996-04-29 1997-10-31 Sncf Torque sensing device for railway shunting operating motor
WO1999066335A1 (en) * 1998-06-16 1999-12-23 M.E.A. Motor Inspection Ltd. Method and system for performance testing of rotating machines
AU748970B2 (en) * 1998-06-16 2002-06-13 M.E.A. Motor Inspection Ltd. Method and system for performance testing of rotating machines
US6591200B1 (en) 1998-06-16 2003-07-08 M.E.A. Motor Inspection Ltd. Method and system for performance testing of rotating machines
CN101726377B (en) * 2009-12-17 2011-08-31 东方电气集团东方汽轮机有限公司 Wind driven generator coupler test-bed and test method
CN101793576A (en) * 2010-04-08 2010-08-04 陈苏琦 Measurement method of electric motor load torque and application thereof

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