SU1250845A1 - Angle-data transmitter - Google Patents

Abstract

The invention relates to a measurement technique and permits an increase in the accuracy of an angle sensor that contains a rotor with two identical bipolar permanent magnets installed displaced along the axis of rotation, and a stator coaxially mounted with it, on which the reed switches are uniformly placed along its periphery. The reed switch axes are parallel to the axis of rotation of the sensor. In the area of each reed switch on the stator, there are two pairs of magnetic conductors. Each pair of magnetic cores is located in the working area of one of the reed switch plates. The distance between the magnetic conductors of each pair is equal to the length of the bipolar magnet. The magnetic circuits of each pair are made of two sections. In one of the pairs of magnetic cores, these sections are mutually parallel, in the other, the two sections are mutually parallel, and the two are mutually crossed. When the rotor rotates the sensor, the poles of the magnets are aligned with the ends of the parallel sections of both pairs of magnetic circuits, the magnetic fluxes from the permanent magnets passing through the mutually parallel sections of the magnetic circuits are summed, as a result of which the contact plates of the corresponding reed switch are closed. With further rotation of the rotor magnets are combined with other parts of the magnetic circuit. Due to the presence of cross sections in one of the pairs of magnetic cores, the magnetic flux in one of the contact plates is reversed and the contact plates of the reed switch are opened. Such an implementation of magnetic circuits eliminates false triggering and sticking of the reed switches, which leads to an increase in the accuracy of angle measurement. 1 hp f-ly, 1 ill. with s (l ate oo ate

Description

one

The invention relates to a measurement technique and can be used to monitor and measure angular displacements.

The aim of the invention is to increase the accuracy of the angle sensor by providing more accurate triggering of reed switches sensitive to the angular position of the sensor rotor.

The drawing shows a constructive implementation of the sensor.

The sensor contains a rotor 1 with two identical bipolar permanent magnets 2 and 3 mounted on it with displacement along the axis of rotation and opposite poles of opposite polarity. Coaxially with the rotor 1, a stator 4 is installed with uniformly located on its periphery reed switches 5 whose axes are parallel to the axis of rotation of the sensor. In the area of each reed switch on the stator of the sensor, two pairs of 6 and 7 magnetic fluxes are installed. Each pair of magnetroproBodes is located in the working area of one of the contact plates of the reed switch 5. The distance between the magnetic cores of each pair b and 7 is equal to the length of the bipolar magnets 2 and 3. The magnetic circuits of each pair 6 and 7 are made of two sections each and may have a V-shaped form. The magnetic circuits of the pair 6 are mutually parallel, and the magnetic conductors of the pair 7 are made with two mutually parallel sections and two mutually intersecting sections. These magnetic B are placed B body non-magnetic gasket 8 mounted on the stator between the rotor 1 and the reed switches 5.

The angle sensor works as follows.

In the initial position of the rotor 1, the permanent magnets 2 and 3 located on it occupy, for example, an intermediate position between adjacent reed switches 5 located around the circumference of the stator 4. Since the reed switches 5 are outside the zone of influence of the magnetic fields created by the magnets, their contact plates are open. When the rotor 1 rotates, the poles of the magnets 2 and 3 are aligned with the corresponding ends of the pairs 6 and 7 of the magnetic cores, so that the magnetic fluxes generated by the fixed permanent magnets 2 and 3 and passing through the mutually parallel sections of these magnetic circuits

250845

2

ruyuts The total magnetic flux passes through the working gap between the contact plates of the reed switch 5, which causes them to close. This corresponds to a single angular displacement of the rotor. Upon further rotation of the rotor I in a pair of 7 magnetic cores and through the corresponding contact plate of the reed switch 5, the direction of the magnetic flux is changed due to the implementation of the magnetic cores of this pair with mutually crossed sections. This causes an abrupt reduction (almost to zero) of the total magnetic flux through the working gap of the reed switch, as a result of which its contact plates open. With

and further rotation of the rotor of the sensor, the permanent magnets are combined with the magnetic conductors of the next reed switch and similarly it triggers, fixing the next angular displacement of the rotor by a single angle of rotation. The value of a single angle is determined by the number of reed switches located along the periphery of the stator. By eliminating false alarms and sticking of reed switches, the accuracy of angle measurement is improved.

Claims (2)

1. Angle sensor containing a rotor with two mounted on it with an offset The axis of rotation is identical constant bipolar magnets facing one another with poles of opposite polarity, and the CoSANNO mounted stator with reed switches evenly distributed on its periphery, the axes of which are parallel to the axis of rotation of the sensor, characterized in that pairs of insulated magnetic cores mounted on the stator in the zone of each reed switch location, the distance between the magnetic cores of each pair is equal to the length of the bipolar magnet, the magnetic cores are one the pairs are mutually parallel, and the magnetic circuits of the other pair are made with two mutually parallel and with two mutually intersecting plots. 2. A sensor according to claim 1, characterized in that the magnetic cores are V-shaped.