ROTARYTORQUESENSOR.COM / CONTACTLESS MEASUREMENTEV MOTOR DYNAMOMETERS / ENGINEERING CONFIGURATION
Define peak load, low-load resolution and acquisition timing together. Review a contactless shaft or bearingless flange configuration for your motor map before committing the shaft train to a drawing.
The application context is prefilled below. Add your actual duty and project details; the quoted drawing and evidence define the accepted configuration.
MEASUREMENT BOUNDARY / CHANNEL ACCEPTANCE
| Boundary / channel | Required measurements | Result or calculation | Review before comparison |
|---|---|---|---|
| Motor shaft | Torque + signed RPM | Mechanical shaft power | Keep polarity, direction and averaging interval consistent. |
| Inverter AC terminals | Synchronized electrical power | Motor electrical-to-mechanical efficiency | Record the measured electrical boundary rather than a drive display estimate. |
| DC bus | DC voltage and current / power | Combined inverter + motor boundary | Declare auxiliary loads and regeneration direction. |
| Thermal and control state | Temperatures, command and time | Comparable duty points | Define stabilization and transient acceptance in the lab protocol. |
These are review requirements, not released instrument ratings. Use the actual channel definitions and sign convention agreed for your laboratory.
Start with MT-RTR-FLG when the bearingless architecture suits the bench. Send torque at speed, pilot geometry, axial space, external support, coupling inertia and the duty cycle. Separate family maxima are not one qualified operating point.
Review bearingless flange geometry ↗Compare the required absolute error at the smallest working torque with every range-dependent specification term. A dual-range request must also resolve overload protection, switching versus simultaneous channels and calibration of both ranges.
Review high/low range behavior ↗Define the shortest event and the desired average before selecting analog, frequency or digital output. Review sensor bandwidth, channel latency, encoder rate, DAQ filters and the mechanical response together. A fast readout alone does not validate dynamic response.
Review the actual signal chain ↗ORIGINAL HYPOTHETICAL CALCULATION / NOT MEASURED DATA
Assume only a ±0.1% of full-scale error term. This is a sizing illustration, not a measured MT-RTR specification or a complete uncertainty statement.
| Hypothetical range | Absolute term | At a 5 Nm reading | Unresolved question |
|---|---|---|---|
| 500 Nm | ±0.5 Nm | ±10% of reading | Can low-load losses be resolved? |
| 50 Nm | ±0.05 Nm | ±1% of reading | How is the low range protected from the peak? |
A smaller range improves this one arithmetic term. Temperature, calibration, mounting, dynamic response and acquisition still contribute. Ask whether the actual proposal switches ranges or measures them simultaneously; verify both channels or ranges at the intended speed.
Request a flange dual-range feasibility review ↗DUTY / DRAWING / CALIBRATION / ACQUISITION
Blank planning aid only. No test readings, certification, supplier approval or acceptance grade are supplied in this worksheet.
Carry this application into a quote / CAD request ↗It may cover the physical load while missing the required low-load error. Specify both objectives and compare the complete uncertainty budget at the smallest torque. A lower range must still be protected against the actual peak.
It gives mechanical shaft power. Efficiency also needs electrical power measured at a declared boundary on a consistent time basis. Motor-only and combined inverter/motor efficiency are different results.
No released combination is implied by a family headline. The selected capacity, rotor geometry, support and complete shaft assembly require an approved speed/torque envelope.
FUTEK TRS705: model-specific shaft and signal drawing ↗
A primary example of model-specific mechanical/output/encoder information to compare. It does not approve MT-RTR fit or performance.
HBK: instantaneous torque ripple and averaging ↗
Primary technical note for instantaneous versus averaged torque and aligned measurement intervals.
Method reviewed . The diagrams, examples and worksheets are original planning aids. Actual drawings, range/speed qualification and genuine calibration/EMC reports remain configuration-specific supplier inputs.
APPLICATION-SPECIFIC MEASUREMENT BOUNDARIES
Separate pump-shaft input from hydraulic output and upstream electrical losses.
Open rotodynamic pump efficiency review ↗Resolve the small loss between two time-aligned torque-and-speed measurement chains.
Open gearbox efficiency and loss review ↗INTERACTIVE DYNO POWER PLANNING
P[kW] = T[Nm] × n[RPM] / 9549.2966. Mechanical hp uses 745.6999 W/hp; it is not metric PS. Signed inputs follow your shaft convention; capacity uses the magnitude.
The multiplier is your preliminary sizing allowance. It does not establish dynamic overload, fatigue or shaft-train safety limits. Those require the selected sensor and coupling data.
NIST horsepower conversion reference ↗Candidate families below require configuration-specific speed and load approval.
DRAWING / PINOUT / CALIBRATION REVIEW
We review the torque/speed duty, mechanical fit and signal chain before proposing a configuration.
Your reply should identify the candidate sensor, coupling bores, drawing/STEP availability, pinout, calibration scope and itemized quotation.
The email link carries the same entries and package options. Your email application opens a draft; send it there to deliver the request. Please share non-confidential specifications first.
Drawings, measured ratings and report availability are confirmed for the selected configuration. Please state your required delivery date and country.
Optional, for up to eight hours since your last edit. Contact details, company, country, quantity, application and original-model reference are excluded. Product pages apply their own series.
Save a text brief for internal engineering review before sending. Downloading does not submit the request.
Still to provide before sending: Full name; Work email; Delivery country; Target torque and units; Project quantity; Maximum operating RPM.
This file includes your entries. Share only with intended recipients.
RotaryTorqueSensor.com | Engineering requirement brief DRAFT REQUEST — not submitted This records requested requirements, not a quotation, released specification or calibration certificate. Rotary torque sensor engineering request Full name: [your name] Work email: [your work email] Company: [optional] Delivery country: [country] Series: MT-RTR-FLG Mechanical interface: Bearingless flange Target torque: [Nm or in-lb] Maximum operating RPM: [RPM] Dual-range pair: [if required] Motor / load shafts: [diameters, fits, keys] Signal: ±10 V Encoder PPR: 360 Bundle: Sensor + matched coupling pair Selected options: Integrated speed encoder: 360 / 1024 PPR (+$65 budget; 2000 PPR quoted separately) | Matched diaphragm / bellows coupling pair, custom bores (+$140 budget) Original model / drawing: [replacement requests] Quantity: [quantity] Application: EV motor dynamometer: review shaft torque/RPM, motoring and regeneration, low-load/peak ranges, electrical power boundary and synchronized acquisition. Please confirm the application-specific configuration and acceptance documents. Source page: /ev-motor-dynamometer-torque-sensors/ Please review configuration, approved drawing / STEP availability, wiring, calibration scope and quotation. ENGINEERING REPLY CHECKLIST - Confirm the combined torque/speed envelope, peaks and required bandwidth. - Supply the capacity-specific approved 2D/STEP and mating-shaft review. - Confirm connector pinout, supply, torque output and encoder/PPR. - Identify actual calibration scope, uncertainty and report availability. - Itemize sensor, couplings and accessories; confirm price and delivery. - Confirm dual-range switching or simultaneous channels when requested. Reply to [email protected] with the request reference when available. Share this file only with intended recipients; it contains the entries you supplied.