The purpose of a basic magnetic speed sensor in rotating equipment is to measure the rotational speed or RPM (Revolutions Per Minute) of the equipment. It is commonly used in various industrial and automotive applications to monitor the speed of rotating components, such as motors, engines, wheels, conveyor belts, fans, and many other types of machinery.
The basic magnetic speed sensor works on the principle of detecting changes in the magnetic field caused by the rotating target. Here's how it generally functions:
Magnetic Target: A ferromagnetic target, usually in the form of a toothed gear or a specially designed gear with magnetic features, is attached to the rotating part of the equipment.
Sensor Pickup: The magnetic speed sensor, also known as a magnetic pickup or magnetic proximity sensor, is mounted near the magnetic target in a fixed position. It typically consists of a coil or Hall effect sensor that can detect changes in the magnetic field.
Magnetic Field Variation: As the target rotates, the teeth or magnetic features of the gear pass by the sensor pickup. This causes fluctuations in the magnetic field around the sensor.
Sensor Output: The magnetic speed sensor generates an electrical signal in response to the variations in the magnetic field. The frequency of this signal is directly proportional to the rotational speed of the equipment. The signal can be in the form of a digital square wave or an analog signal, depending on the specific sensor used.
Speed Measurement: The electrical signal is then processed by electronic circuits or control systems to determine the rotational speed of the equipment. The frequency of the signal is typically converted to RPM, which provides valuable information about the performance and operation of the rotating machinery.
Magnetic speed sensors are favored for their simplicity, reliability, and durability, making them suitable for a wide range of applications. They are widely used in industries such as manufacturing, transportation, power generation, and automation, where monitoring and controlling the rotational speed of equipment is crucial for efficiency, safety, and maintenance purposes.