Specifications

CONFIDENTIAL
Bendix Commercial Vehicle Systems LLC
Elyria, OH 44036
PRODUCT SPECIFICATION - BW-283-PR
SPEC. BW-283-PR
73 SHEETS
SHEET NO. 25
pushed back slightly. Normal bearing endplay will also cause the sensor to be pushed
slightly away from the exciter ring. These two actions establish an air gap between the
sensor and exciter ring.
The exciter ring is provided by the hub supplier, which contains equally spaced high/low
areas called “teeth”. Exciter rings typically contain 100 teeth.
The WS-24 WSS magnet and pole piece develop a magnetic field. When the wheel
rotates, the exciter ring teeth pass through the magnetic field. This alters the magnetic
field and generates an AC voltage in the sensor coil. The frequency of this AC signal is
analyzed by the TABS6 ECU to determine the speed of the wheel. As the speed of the
wheel increases, so does the frequency of the AC signal.
The voltage amplitude of the AC signal is an indication of the air gap between the WS-24
WSS and the exciter ring. The signal amplitude will increase as the air gap decreases.
Figure 16: Wheel Speed Sensor with Tone Wheel
3.3.1 WS-24 WSS Specifications
Parameter Limits
Nominal Resistance 1750 Ω ± 175 Ω @ room temperature
Inductance 1.3H ± @ 1kHz/1VRMS
Output Voltage 0.400 VAC @ a minimum of 100 Hz (~ 7 MPH)
Table 6: WS-24 WSS Specifications
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