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LW12.8-50-TEL wheel force transducer

LW12.8-50-TEL wheel force transducer LW series

Six-axis telemetry wheel force transducer for passenger cars and light-duty trucks, 50 kN radial and 25 kN lateral, with induction-powered electronics built into the transducer.

50 kN
Fx, Fz capacity
25 kN
Fy capacity
6.5 kN·m
Moment capacity
≤ 0.2 % FS (Fx, Fz, My)
Non-linearity
  • OutputsFx Fy Fz · Mx My Mz
  • Also measuredX and Z acceleration (X, Y, Z on the LW50) · wheel speed and angle
  • Signal outputanalog · CAN · Ethernet · CAN FD and EtherCAT on the CT3

Telemetry wheel force transducer for cars, 50 kN

The LW12.8-50-TEL measures all the wheel forces and moments on passenger cars and light-duty trucks. Its 4-arm strain gage bridges are rated 50 kN (11,200 lb) on Fx and Fz, 25 kN (5,600 lb) on Fy and 6.5 kN·m on all three moments, with non-linearity of 0.2 % of full scale or less on Fx, Fz and My. The telemetry and induction power electronics are packaged into the weatherproof transducer, 6.0 kg with them. Data is sent at 2,200 Hz with 16-bit resolution, the wheel angle resolved to 0.25°. It operates from −40 to 125 °C and adapts to 14 in and larger wheels.

The stainless steel or titanium hub adapter and the rim adapter bolt to the transducer with M10 screws torqued to 81 N·m; narrow-head screws from Michigan Scientific fit the rim side. The telemetry stator, which holds the receiver, induction coil and encoder pick-ups, mounts inboard on an adjustable bracket, set with an alignment tool. The CT2-TEL box, powered at 10 to 36 V DC, supplies the induction power, zeroes the transducer and transforms the loads; the wheel comes off without removing the electronics.

With no cable through the hub, it is used to test vehicles on snow and ice, where the transducer stays at the wheel in the cold and the wet.

Wheel force transducer with amplifier and slip ring assembly
Transducer, amplifier and slip ring. The slip ring and the telemetry package are swappable.

Specifications

LW12.8-50-TEL
Measured quantitiesFx · Fy · Fz · Mx · My · Mz
Force capacityFx 50 · Fy 25 · Fz 50 kN
Moment capacityMx 6 500 · My 6 500 · Mz 6 500 N·m
Non-linearityFx ≤ 0.2 · Fy ≤ 0.5 · Fz ≤ 0.2 · Mx ≤ 1 · My ≤ 0.2 · Mz ≤ 1 % FS
Hysteresis≤ 1 % FS
Crosstalk≤ 1 % FS (before compensation)
Angle resolution0.25°
Axes6
Sensing principleStrain gage (4-arm bridges)
Sensitivity variation over a revolution≤ 1 % FS
Rated output0.8 mV/V
OutputAnalog voltage · CAN · Ethernet
Bandwidth0.2 kHz (< −0.1 dB; 500 Hz at < −1.0 dB)
Sample rate2.2 kHz
Resolution16 bit (1.8 N · 0.27 N·m)
Signal transmissionTelemetry
Supply voltage10 to 36 V (about 2.0 A at 13.5 V DC)
Power sourceInduction
Shaft diameter198.02 mm (center bore)
Mounting fasteners18 × Ø 9.91 mm
Rim fasteners12 × Ø 9.91 mm
Bolt circle213.26 mm
Rim bolt circle324.97 mm
Fatigue tested toSAE J328
DimensionsØ 340.18 × 25.64 mm
Weight6 kg (with telemetry electronics)
Operating temperature−40 to 125 °C
Operating temperature, stationary electronics−20 to 60 °C (CT2-TEL)
Interface boxCT2-TEL
VehiclesPassenger cars · Light trucks
Rim size14 in (and larger)
Drawing C566009A, LW12.8 (PDF)
Shown: LW12.8-50-TEL. Download the files

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Signal transmission

By wire: amplifier, slip ring and encoder on the wheel. Not on the LW-MC-3.5K and LW12.8-50-TEL.

Options
Accessories
Your request

Unusual bolt pattern, motorsport hub, agricultural wheel: we build it around your wheel.

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