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Chapter 2
2.1
VR Sensor
Overview
© Copyright 2024
United Electronic Industries, Inc.
Functional Description
This chapter describes the device architecture, hardware, and functionality of
the DNx-VR-608 Variable Reluctance Interface. The following sections are
provided in this chapter:
•
VR Sensor Overview (Section 2.1)
•
DNx-VR-608 Device Architecture (Section 2.2)
•
Measurement Resolution and Accuracy (2.3)
•
Indicators and Connectors (Section 2.4)
•
DNA Cube Jumpers (Section 2.5)
•
Pinout (Section 2.6)
Variable reluctance (VR) sensors are electromechanical transducers used to
measure the rotational speed and position of a crankshaft. The VR sensor
consists of a permanent magnet surrounded by a coil of wire. A toothed wheel
made of a ferrous material is attached to the crankshaft, and the VR sensor is
positioned close to the teeth (Figure 2-1).
S
Figure 2-1 Variable Reluctance Sensor and Toothed Wheel
When a tooth rotates past the sensor, the distance between the wheel and
sensor changes, changing the magnetic flux through the pickup coil. An AC
voltage is induced across the coil as shown in Figure 2-2. In the default polarity,
voltage is positive when the tooth approaches the sensor and negative when the
tooth moves away. Notably, the positive-to-negative zero crossing coincides with
the center of the tooth.
February 2024
DNx-VR-608 Variable Reluctance Interface
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Chapter 2
Functional Description
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