Rotating torque meter

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David Reynolds
6 years ago
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1 Rotating torque meter

A longtime dream, a slip-ring-less rotating torque meter, UTM, has just become available. We developed it as a high performance sensor for embedded applications.

2 A longtime dream, a slip-ring-less rotating torque meter, UTM, has just become available. We developed it as a high performance sensor for embedded applications. Of course, it is also perfect for general dynamic torque measurement. This is our masterpiece, which has 1/10000-resolution, outstanding zero-point stability and 200Hz-bandwidth. UNIPULSE was originally established by several young engineers in 1970 and has specialized in industrial measurement since that time. We have developed a lot of unique products and expanded our own market. Though we had wished to make a high-performance torque meter for 40 years, we couldn't do so because miniaturization of electronics was not possible. However, we have finally succeeded in developing a rotating torque meter, UTM, by adopting small advanced electronic components and integrating our own technologies related to precision machining, strain gauge technology and electronics. All UTM output a pulse signal per rotation. Targetting to the size of D battery, or close, we tried to minimize the size of 4 models, UTM- 0.03Nm, 0.3Nm, 3Nm and 30Nm, and we succeeded. For the products, a 2000C/T optical rotary encoder is optionally available for measuring torque variation against angular position, making it suitable for physical sensory tests. Although the static frictional torque for UTM 0.03Nm is only Nm, we also provide an air-bearing option for more accurate measurements. UTM-300Nm and 3000Nm are for large torque applications and key groove option is available for both. The full scales of torque in positive and negative directions are precisely calibrated into ± V outputs. We provide 3 types of scalers as accessories for changing the full scale torque of UTM to 2/3, 1/3 and 1/6. UTM is the best available torque meter right now. We supply UTM as a reliable product under strict quality control. We are continuously concentrating in R&D and will create more unique products. We hope you are looking forward to our future products. President & CEO Ta k a m i Yo s h i m o t o (From an engineer's view point... ) 1

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Overview Principle of UTM UTM adopts strain gauges for detecting torsional strain, which is converted into an electric signal by a strain amplifier fixed on the rotating shaft.

4 Overview Principle of UTM UTM adopts strain gauges for detecting torsional strain, which is converted into an electric signal by a strain amplifier fixed on the rotating shaft. Electric power for the rotary electronics is supplied continuously through a wireless power system originally developed by UNIPULSE. The torque is converted into digital signal on the rotary electronics, and it is transferred optically to the electronics fixed to the main frame. The digital signal is reconverted into a voltage signal by a D/A converter. Overview Compact and easy to install Compact body: 62W x 45H x 40D mm (UTM-0.03Nm, 0.3Nm, 3Nm and 30Nm) Maintenance-free High accuracy and stability 1/10000 resolution with outstanding zero stability. Even small torque variations can be detected by UTM. Max. speed rpm No slip-ring. The lifetime of UTM is mainly determined by the lifetime of bearings. UTM-0.03/0.3/3/30Nm UTM-300Nm UTM-3000Nm 25000rpm 12000rpm 8000rpm Small starting torque Built-in amplifier allowing for simple set-up The starting torque of the bearing in the UTM- 0.03Nm is only Nm (0.03 %FS). Actually, the effect of rotating friction can be negligible. Simultaneous monitoring of torque and rotating speed High speed response Using TM300, which was developed for the UTM, torque, rotating speed and power can be monitored simultaneously. UTM can measure high speed torque changes such as torque ripple, torque transient, etc. 3

5 Line-up Line-up Type Main frame Range Shaft dia. Length Weight Max. speed dimension (Nm) (mm) (mm) (g) (rpm) (W H D mm) UTM-0.03Nm ± 0.03 φ UTM-0.3Nm ± φ UTM-3Nm ± UTM-30Nm ± 30 φ UTM-300Nm ± 300 φ UTM-3000Nm ± 3000 φ Optional Rotary encoder, Air-bearing Rotary encoder Key groove 4

UTM-0.03Nm UTM-0.03Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-0.03Nm ± 0.

6 UTM-0.03Nm UTM-0.03Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-0.03Nm ± 0.03Nm(Approx. ± 0.3kgcm) DC24V ± 15% Consumption current:50ma ± 5V DC Load resistance must be more than 2kΩ fc = 200Hz(-3dB) 1 pulse per 1 rotation Open collector Max. ratings 30V, 0.1A 200% FS Operation temp. range -10 ~ +50 Temp. effect on ZERO 0.01%FS/ (Typ) Temp. effect on span 0.01%FS/ (Typ) Max. rotation speed 25000rpm Dimension (Main frame) 62(W) 45(H) 40(D)mm Weight 190g Attached cable 6 wires (End points: Peeled insulator and soldered) Accesories CATM51:5m CATM12:10m Cable colors Color Red Black Green White Yellow Brown Shield Description PWR(+24V) Consumption current:50ma PWR GND SIG OUT(± 5VDC) Load resistance must be more than 2kΩ SIG GND PULSE OUT(Open collector) Max. ratings: 30V, 0.1A PULSE GND Shield is not connected anywhere PWR GND, SIG GND and PULSE GND are connected inside. 5

7 UTM-0.3/3Nm Type UTM-0.3Nm UTM-3Nm Measurement range ± 0.3Nm(Approx. ± 3kgcm) ± 3Nm(Approx. ± 30kgcm) Power supply DC24V ± 15% Consumption current:50ma Output range ± 5V DC Load resistance must be more than 2kΩ Cut-off frequency fc = 200Hz(-3dB) Rotation signal 1 pulse per 1 rotation Open collector Max. ratings 30V, 0.1A Safe overload 200% FS Non-linearity Hysteresis Repeatability Operation temp. range -10 ~ +50 Temp. effect on ZERO 0.01%FS/ (Typ) Temp. effect on span 0.01%FS/ (Typ) Max. rotation speed 25000rpm Dimension (Main frame) 62(W) 45(H) 40(D)mm Weight 205g 215g Attached cable 6 wires (End points: Peeled insulator and soldered) Accesories CATM51:5m CATM12:10m Cable colors Color Red Black Green White Yellow Brown Shield Description PWR(+24V) Consumption current:50ma PWR GND SIG OUT(± 5VDC) Load resistance must be more than 2kΩ SIG GND PULSE OUT(Open collector) Max. ratings: 30V, 0.1A PULSE GND Shield is not connected anywhere PWR GND, SIG GND and PULSE GND are connected inside. UTM-0.3/3Nm 6

UTM-30Nm UTM-30Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-30Nm ± 30Nm(Approx.

8 UTM-30Nm UTM-30Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-30Nm ± 30Nm(Approx. ± 3kgm) DC24V ± 15% Consumption current:50ma ± 5V DC Load resistance must be more than 2kΩ fc = 200Hz(-3dB) 1 pulse per 1 rotation Open collector Max. ratings 30V, 0.1A 200% FS Operation temp. range -10 ~ +50 Temp. effect on ZERO 0.01%FS/ (Typ) Temp. effect on span 0.01%FS/ (Typ) Max. rotation speed 25000rpm Dimension (Main frame) 62(W) 45(H) 40(D)mm Weight 290g Attached cable 6 wires (End points: Peeled insulator and soldered) Accesories CATM51:5m CATM12:10m Cable colors Color Red Black Green White Yellow Brown Shield Description PWR(+24V) Consumption current:50ma PWR GND SIG OUT(± 5VDC) Load resistance must be more than 2kΩ SIG GND PULSE OUT(Open collector) Max. ratings: 30V, 0.1A PULSE GND Shield is not connected anywhere PWR GND, SIG GND and PULSE GND are connected inside. 7

UTM-300Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-300Nm ± 300Nm(Approx.

9 UTM-300Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-300Nm ± 300Nm(Approx. ± 30kgm) DC24V ± 15% Consumption current:60ma ± 5V DC Load resistance must be more than 2kΩ fc = 200Hz(-3dB) 1 pulse per 1 rotation Open collector Max. ratings 30V, 0.1A 200% FS Operation temp. range -10 ~ +50 Temp. effect on ZERO 0.01%FS/ (Typ) Temp. effect on span 0.01%FS/ (Typ) Max. rotation speed 12000rpm Dimension (Main frame) 92(W) 77(H) 70(D)mm Weight Approx. 2.3kg Attached cable 6 wires (End points: Peeled insulator and soldered) Accesories CATM51:5m CATM12:10m Cable colors Color Red Black Green White Yellow Brown Shield Description PWR(+24V) Consumption current:60ma PWR GND SIG OUT(± 5VDC) Load resistance must be more than 2kΩ SIG GND PULSE OUT(Open collector) Max. ratings: 30V, 0.1A PULSE GND Shield is not connected anywhere PWR GND, SIG GND and PULSE GND are connected inside. UTM-300Nm 8

UTM-3000Nm UTM-3000Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-3000Nm ± 3000Nm(Approx.

10 UTM-3000Nm UTM-3000Nm Type Measurement range Power supply Output range Cut-off frequency Rotation signal Safe overload Non-linearity Hysteresis Repeatability UTM-3000Nm ± 3000Nm(Approx. ± 300kgm) DC24V ± 15% Consumption current:60ma ± 5V DC Load resistance must be more than 2kΩ fc = 200Hz(-3dB) 1 pulse per 1 rotation Open collector Max. ratings 30V, 0.1A 200% FS Operation temp. range -10 ~ +50 Temp. effect on ZERO 0.01%FS/ (Typ) Temp. effect on span 0.01%FS/ (Typ) Max. rotation speed 8000rpm Dimension (Main frame) 100(W) 108(H) 102(D)mm Weight Approx. 8kg Attached cable 6 wires (End points: Peeled insulator and soldered) Accesories CATM51:5m CATM12:10m Cable colors Color Red Black Green White Yellow Brown Shield Description PWR(+24V) Consumption current:60ma PWR GND SIG OUT(± 5VDC) Load resistance must be more than 2kΩ SIG GND PULSE OUT(Open collector) Max. ratings: 30V, 0.1A PULSE GND Shield is not connected anywhere PWR GND, SIG GND and PULSE GND are connected inside. 9

11 Option Rotary encoder < Type > UTM-0.03Nm(R) UTM-0.3Nm(R) UTM-3Nm(R) UTM-30Nm(R) * Maximum rotation speed is 4500 rpm. Air-bearing Option < Type > UTM-0.03Nm(A) UTM-300Nm(K) UTM-3000Nm(K) Key groove < Type > UTM-300Nm(K) UTM-3000Nm(K) 10

Accessories TMS1 Scaler Rescaling original full-scale torque of UTM into 2/3, 1/3

Accessories TM300 Torque monitor Torque monitor specialized for UTM.

Upper/lower comparators with hold functions. Data storage function.

12 Accessories TMS1 Scaler Rescaling original full-scale torque of UTM into 2/3, 1/3 and 1/6. (Please specify when you order TMS1.) *The voltage output will remain ± 5V. Accessories TM300 Torque monitor Torque monitor specialized for UTM. Torque, Rotation speed and Power are displayed simultaneously. Upper/lower comparators with hold functions. Data storage function. Easy connection to UTM with one cable. Special case DTC2-PSL TM300 TORQUE MONITOR UTM AC I N r pm A1 B1 MONITOR F.G. A12 B12 MADE IN JAPAN 11

F377A Digital indicator / F388A Waveform

Visualizing torque variation Upper/lower

Torque monitoring for continuous rotating

Special case DTC2 Torque monitoring against

13 F377A Digital indicator / F388A Waveform checker Multi-purpose analog voltage monitor Visualizing torque variation Upper/lower comparators, latch function F377A F388A Torque monitoring for continuous rotating applications. Torque variation against time. Special case DTC2 Torque monitoring against angular position. Special case DTC1 Accessories DTC2 DTC1 12

$However, radial/thrust overloads will not only result in measurement error but also heating-up of the bearings and/or irreversible distortion or fracture of UTM.$

14 Coupling What s coupling? UTM adopts strain gauges for measuring torsional strain on the shaft. The shaft is designed to withstand any disturbing stress induced by radial or thrust forces. However, radial/thrust overloads will not only result in measurement error but also heating-up of the bearings and/or irreversible distortion or fracture of UTM. Typical misalignments, radial misalignment, angular misalignment, and endplay are shown in the figure below. Remaining misalignments between the UTM shaft and drive/load shafts induce radial and thrust forces. Hence couplings are required to absorb these disturbing forces and improve smoothness of rotating and accuracy. Allowance levels of the misalignments are dependent on the combination of the range of UTM and couplings; thus fine adjustment will be needed for actual usage. Radial misalignment Angular misalignment Endplay Recommended coupling Coupling We strongly recommend rubber couplings shown in the righthand side photograph (Correspondent couplings are indicated by in the following table). Rubber coupling is composed of two rigid parts connected to the axes with rubber joining the two parts. No backlash, well rotation balance and excellent damping of vibration are the features of rubber coupling, and thus they are the most suitable couplings for UTM. If you can not choose rubber couplings, please select single disk couplings. If you use multiple double disk couplings or slit type couplings on the axis, unexpected vibration may occur because UTM is suspended by springs. Unexpected vibration reduces accuracy and results in damage on UTM in the worst case. How to use coupling UTM shafts are connected to drive-side and load-side shafts with rubber couplings as shown in the below. If the load and driving devices have bearing internally, the bearings in the figure are unnecessary. Main frame of UTM should be fixed loosely to the base. Please minimize the torque fluctuation synchronized to rotation and adjust the misalignments carefully. 13

15 Warning in high rotating speed Rotating balance adjustment is needed for torque measurement over 3000rpm rotating speed. Unbalance of rotating body induces vibration, which causes damage on UTM or coupling. Before conducting high speed operation, do the balance adjustment carefully. We do not recommend key groove option for high speed applications. Prohibition Do not use Oldham coupling. UTM will come off the original position, and UTM or other devices will be damaged. Do not use double disk coupling or slit type coupling. Unexpected resonant vibration occurs, and it generates overloads or damages to UTM. Recommended coupling Coupling Recommended couplings are indicated in the below table. Please contact our sales staff for the details of coupling or the coupling for UTM-3000Nm. Type UTM dia. (mm) UTM-0.03Nm 5 Coupling type Max torque (Nm) Coupling dia.(mm) UCM UCS15 1 UCM UCS UCM25 8 UCS UTM-0.3Nm UTM-3Nm UCM UCS UCM25 8 UCS UCM UCS UCM34 16 UCS34 11 UCM39 27 UCS39 14 UCM UTM-30Nm 12 UCM UTM-300Nm 35 UCM :Recommended rubber coupling 14

16 Attached cable Class Pin number Signal name Details Connect to +24V power supply. Voltage range must be within +24V plus-minus 15%. Use a power supply which can operate with small load because the current 1 PWR (+ 24V) consumption of UTM is low (50mA or 60mA). Power Attached cable Technical data Torque signal 2 PWR GND 3 SIG OUT (± 5V DC) 4 SIG GND Although 2, 4 and 6 pins are connected each other internally but respective wire should be connected separately for preventing voltage error. This is signal output. The signal is adjusted to 0V for no-load and 5V for full scale. The minimum resistant is 2k Ω. In case of electrically noisy environment, please try to insert RC low-pass filter as below. This is effective to reduce high frequency noises. Rotating 5 PULSE OUT (Open collector) Pulse signal output generates 1 pulse per 1 rotation. Rated voltage and current are 30V and 0.1A, respectively. pulse 6 PULSE GND Technical data Type UTM-0.03Nm UTM-0.3Nm UTM-3Nm UTM-30Nm UTM-300Nm UTM-3000Nm Measurement range (Nm) ± 0.03 ± 0.3 ± 3 ± 30 ± 300 ± 3000 Torsional spring constant (Nm/rad) Maximum torsional angle (10-3 rad) 8.00 (0.458 ) 9.83 (0.563 ) 9.04 (0.518 ) (0.822 ) 7.85 (0.45 ) 10.0 ( ) Inertia (kgcm 2 ) Torsional natural frequency (khz) Maximum radial load (N) Maximum thrust load between shaft and main frame (N) Maximum thrust load between load-side end and drive-side end (N) Radial and thrust loads should be as small as possible for accurate measurement. 15

17 Definitions of technical terms Definitions of technical terms 16

18 Application examples Servo motor with torque output Rotary encoder Load 870 Motor Angular position Torque signal Servo driver PLC etc. Positioning signal By setting UTM between the rotary encoder and motor, you can make a servo motor system with torque output. The system can be applied to various applications, such as robot hands or other Application examples systems which can detect load. Physical sensory test Gear box (Inspection target) Reduction gear 870 (with rotary encoder option) Motor Angular position Torque signal PC etc. Torque corresponding to angular position can be monitored by using UTM with rotary encoder option. The system can be applied to automation of physical sensory test. Motor test bench Motor to be inspected 870 Load device (motor etc.) Motor driver Torque signal Torque 70 Rotating speed Pulse signal Controller Regenerative electric power Load driver with electric regeneration function Mechanical power can be calculated from torque and rotating speed. By using regenerative electric power, the system can be power-saving and environmentally-friendly. 17 UTM121030E.indd /02/14 21:04:24

19 Mixer with torque meter Screw driver with torque monitoring Motor Motor PLC etc. PLC etc. Reduction gear Motor driver Motor driver Pulse signal GO/NOGO signal Torque signal 870 Torque signal 870 Torque GO/NOGO signal 70 Rotating angle Pulse signal ) $ 7RUTXH GO/NOGO signal 7LPH ) $ Mixing impeller The system measures torque on the axis of mixing To r q u e c a n b e m e a s u r e d i n t h e p r o c e s s o f monitoring torque. By using TM300 and F377A, I/O controlled during the whole process, the system impellers. The change of viscosity can be detected by tightening screws. Since the torque can be signals can be controlled by the threshold levels. can be applied to automation of process. Engine test bench (QJLQH 870 /RDG GHYLFH PRWRU HWF 7RUTXH VLJQDO 7RUTXH 5RWDWLQJ VSHHG &RQWUROOHU 70 3XOVH VLJQDO In case of torque measurement with large vibration, such as measurement of engines, please attach double disk coupling and use double bearing. 5XEEHU FRXSOLQJ 6LQJOH GLVN FRXSOLQJ 'RXEOH GLVN FRXSOLQJ %HDULQJ 18 UTM121030E.indd /02/14 21:04:28

Unipulse Corporation International Sales Department 9-11 Nihonbashi Hisamatsucho, Chuo-ku, Tokyo 103-0005 Tel: +81-3-3639-6121 Fax: +81-3-3639-6130 Head Office 9-11 Nihonbashi Hisamatsucho, Chuo-ku,

20 Unipulse Corporation International Sales Department 9-11 Nihonbashi Hisamatsucho, Chuo-ku, Tokyo Tel: Fax: Head Office 9-11 Nihonbashi Hisamatsucho, Chuo-ku, Tokyo Technical Center 1-3 Sengendainishi, Koshigaya, Saitama Nagoya Sales Office CK16 Fushimi Bldg Sakae, Naka-ku, Nagoya Osaka Sales Office Sumitomo Seimei Shin Osaka Kita Bldg Miyahara, Yodogawa-ku, Osaka Hiroshima Sales Office Funairi Reiku Bldg 9-20 Funairihonmachi, Hiroshima * Please note that specifications or designs shown in this catalog may be changed without prior notice due to our continuous product improvement activities. Rev FEB.

Rotating Torque Meter

Rotating Torque Meter A longtime dream, a slip-ring-less rotating torque meter, UTMⅡ, has just become available. We developed it as a high performance sensor for embedded applications. Of course, it is