What is a speed signal motor
Second, the speed signal motor
The most representative speed signal motor is a tachogenerator. The tachogenerator is an electromagnetic device that detects the mechanical speed. It can convert the mechanical speed into a voltage signal. The output voltage is proportional to the input speed and is decelerated in VEMT. The automatic control system and the computing device of the box are generally used as a speed measuring element, a correcting element, a solving element, and an angular acceleration signal element, etc., which are essentially an electromagnetic element that converts the rotational speed into an electrical signal. In terms of working principle, it belongs to the category of "generator". The tachogenerator is mainly used as a damping element, a differential element, an integral element and a speed measuring element in the control system.
The tachogenerator has DC and AC points; while the DC tachogenerator has separate excitation and permanent magnets. Its structure and working principle are the same as those of the small power DC generator. Usually, the output power is small, which is required as a computing component. The linearity error and temperature error of the output voltage are below an upper limit. The AC tachogenerator has synchronous and asynchronous points;
Synchronous tachogenerators include: permanent magnet, inductive and pulsed; the most widely used asynchronous tachogenerator is the cup rotor asynchronous tachogenerator. In order to improve the accuracy and reliability of the tachogenerator, a Hall-effect DC tachogenerator with a brushless structure has appeared in the DC tachometer motor. Because this Hall-effect brushless DC tachogenerator is a gearless, winding-free motor, it does not produce "cogging harmonic potential" due to the cogging. This motor is simple in structure and easy to use. miniaturization.
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