SU482678A1 - Device for measuring the speed of rotation and the angle of rotation of the rotor - Google Patents

Description

one

The proposed device relates to elements of measuring the speed of rotation and angle of rotation and can be used, for example, as a sensor for automatic control systems.

Devices for measuring the angle of rotation of the rotor are known, which contain a single-winding saturation choke with a toroidal core and a U-shaped rotating permanent magnet coaxially with it.

The proposed device differs from the known ones in that a fixed U-shaped permanent magnet is installed coaxially with a rotating U-shaped permanent magnet, and a saturation throttle is located in the gap between the poles.

This makes it possible to increase the power of the output signal by measuring both the angle of rotation and the speed of rotation of the rotor with the help of the device and thereby expanding its area of application.

The drawing shows the block diagram of the device.

The rotating U-shaped permanent magnet 1, connected to the output shaft of the rotor 2, can freely rotate relative to the single-winding saturation droplet 3 with the toroidal core and the fixed Primary permanent magnet 4 mounted in the device case 5 mounted in turn on the case 6 rotor. The device is powered by a sinusoidal voltage and, the amplitude of which does not exceed the saturation value of the throttle 3.

The device works as follows.

The value of current / n, which is a function of the inductive resistance of the electric circuit of the saturation droplets, is determined by the angular position p of the movable magnet 1 relative to the fixed magnet 4. In the initial position, the magnets 1 and 4 are combined with their opposite poles and "divide the saturation choke 3 saturation by two symmetrical halves whose inductances have maximum values determined by the magnetizing current (no-load current). When the magnets 1 and 4 are combined with the same poles, the inductive resistances of both halves of the drossel become minimal. In this case, the current / n reaches its maximum possible value. The rotation of the rotor 2 at a speed n periodically changes the mutual position of the magnets 1 and 4, as a result of which an amplitude-modulated current is established in the electrical circuit of the saturation throttles. The frequency of the modulated current envelope, proportional to the measured rotational speed, is recorded, for example, by a pulse counter. When the rotor stops at any intermediate position, the current modulation disappears, the envelope frequency becomes equal to zero, and the current / W value fixed by the pointer is proportional to the angle of rotation p of the movable magnet relative to the fixed magnet.

Subject invention

An apparatus for measuring the speed of rotation and the angle of rotation of the rotor, comprising a single-turn saturation throttle with a toroidal core and a U-shaped rotating permanent magnet coaxially with it, characterized in that, with

In order to unravel the field of application, a fixed U-shaped permanent magnet is mounted in conjunction with a rotating U-shaped permanent magnet, and a saturation throttle is located in the gap between the poles of the magnets.