SENSORS

Delphi Variable Reluctance Sensor
The Delphi Variable Reluctance Sensor is an electro-magnetic
device that measures engine speed and position, transmission
speed, and vehicle speed. It is designed for use with control units
that accept analog input.
Delphi Variable Reluctance Sensor consists of a permanent
magnet surrounded by a winding of wire and, for application
flexibility, it can be used in conjunction with a ferrous target that
has either notches or teeth. Rotation of the target wheel near the
tip of the sensor changes the magnetic flux creating an analog
voltage signal in the sensor coil that is proportional to the rotating
speed and position. The voltage signal is sent to the control unit
where it is often converted to a digital signal to support the
controlling function.
The Delphi Variable Reluctance Sensor is available in both over
molded and non-over molded discrete designs, in both sealed
and unsealed configurations, and with or without a harness.
Delphi Variable Reluctance Sensor

Benefits
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Low cost, robust proven speed and position sensing technology
Self-generating electrical signal requires no external power supply
Fewer wiring connections contribute to excellent reliability
Meets a wide range of output, resistance, and inductance requirements so the sensor can be tailored to meet specific
customer requirements

Typical Applications
The Delphi Variable Reluctance Sensor is designed for use in a wide range of automotive applications
including engine (cam and crank: speed and position) and transmission (input and output speed).
Delphi's Variable Reluctance Sensor is well-suited for a variety of other industrial applications.

Performance Advantages
The Delphi Variable Reluctance Sensor's non-overmolded coil design and unique termination technique
help provide high reliability and low warranty returns. The over molded design offers further cost
advantages. Due to their efficient magnetic circuit design and packaging flexibility, Delphi's Variable
Reluctance Sensor can be tailored to meet customer objectives for smaller packaging, larger air gap
capability, higher temperatures, and maximized output.

Performance Specifications
Output
Air gap
Resistance
Temperature

0.25 V to 400 V
0.25 mm to 2.8 mm
200 Ω to 4,000 Ω
-40°C to 165°C

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