Figure 1: Speed sensor type is largely determined by the application. Source: SensoronixChoosing a speed sensor depends on an application’s requirements. The most common speed sensor types are discussed below.

The Hall-effect zero speed sensors provide precise measurement of a rotating shaft down to zero speed, making them ideal for applications requiring a measurement at very low velocity or even zero speed. This type of sensor requires an external power source and provides digital square wave output with constant amplitude signal regardless of variation of the speed or air gap. Common applications include but are not limited to engine control systems, ignition timing, transmission speed and traction control.

The Hall-effect speed and direction sensors are non-contact magnetic devices that measure the distortion of magnetic fields, providing precise measurements of speed and direction. Some of the most common applications include dynamometers and traction control.

The Hall-effect linear speed sensors are used to measure the range of velocity of a ferrous target. This sensor is a complex powered device with signal conditioning and provides a 4 to 20 mA or a 0 to 10 V DC linear output voltage. Some of the most common applications include but are not limited to wind turbines speed measurement, radar speed measurement and linear output rotary sensor.

The variable reluctance speed sensor is an analog output (sine wave) sensor that can be suitable for a low-speed measurement application. The VR speed sensor does not require an external power source and the analog signal output is generated by the collapse of a magnetic field due to the interruption by a ferrous gear tooth.

The variable reluctance speed sensor with complementary output is a different version that can be used for applications that require a VR sensor with dual outputs. This sensor provides two analog signal outputs (sine wave) and does not require an outside power source.

It is also important to note that when choosing a sensor many factors should be taken into consideration for precise speed measurement, such as the application’s environmental requirements.

Sensoronix Inc., (ISO9001-AS9100), with headquarters in Irvine, California, is a leading manufacturer of non-contact magnetic sensors, offering a wide range of standard and customized magnetic-sensor solutions providing for precise measurement of speed, direction, position and proximity. Sensoronix offers engineering and manufacturing services from prototype to production for low- and high-volume requirements. Sensoronix has provided high-quality sensors for a variety of applications in various industries ranging from aerospace and military to automotive, healthcare and industrial.

Sensoronix key differentiators:

· Over 30 years of experience in the design of high-precision magnetic sensors

· Wide range of standard and customized solutions for military and aerospace

· Pioneer in developing Hall effect technology to replace VR technology for highly sensitive applications

· Large global footprint in U.S, Europe, Asia, Australia and Latin America

· Emphasis on R&D for new and innovative designs

· Highly efficient engineering workflow management to ensure quality and efficiency

· Has maintained its reputation in the industry for high-quality sensor products and services, with hundreds of customers globally

· Cost-effective solutions while maintaining highest level of quality

For more information, visit sensoronix.com.