Speed measurement magnetoelectric encoder based on multi-antipode magnetic steel and auxiliary stator winding

Abstract

The invention discloses a magnetoelectric encoder with an end auxiliary stator coil. The auxiliary stator coil is cut by a magnetic field when multi-antipode magnetic steel rotates to generate voltage, the rotating speed of the current encoder is judged by reading a voltage peak value, and the rotating speed direction of the current encoder is obtained by an angle value signal differential value obtained by multi-antipode Hall calculation. The magnetoelectric encoder comprises an encoder structure, an auxiliary stator coil structure and a side shaft. The side shaft rotates, the multi-antipodemagnetic steel is driven to rotate to cut the auxiliary stator coil in a magnetic field, the voltage is generated, the higher the rotating speed of the rotor is, the higher the amplitude of the sine voltage obtained in the winding coil is, the voltage amplitude and the rotating speed are in a linear proportional relation, the rotating speed of the current encoder is judged by reading a voltage peak value, and the rotating speed direction of the current encoder is obtained through an angle value signal differential value obtained through multi-antipode Hall calculation.

Description

technical field [0001] The invention discloses a magnetoelectric encoder, in particular to a speed measuring magnetoelectric encoder based on multi-pair pole magnetic steel and auxiliary stator windings. Background technique [0002] The encoder is used to measure the angular position of the motor rotor and is the core component for motor control. It is widely used in high-tech fields such as mechanical engineering, robotics, aviation, and precision optical instruments, and plays a vital role in modern industry. Magnetic encoders have the advantages of simple structure, high temperature resistance, oil resistance, impact resistance, small size, and low cost, and have unique advantages in miniaturization and harsh environmental conditions. [0003] In the control system, the encoder communicates with the controller to transmit the angle value, which is used for the current loop control of the control system. The angle value is differentially calculated to obtain the current ...

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Problems solved by technology

[0004] However, the angle value signal of the magnetoelectric encoder is affected by the noise of the system power supply, and the angle value is mixed with high-frequency noise. For an encoder angle value calculation process, the angle value solution period is usually about 50 microseconds. The calculation of the speed needs to rely on the difference between the angle value of the current cycle and the angle value of the previous cycle divided by the time constant of the calculation cycle, because the time constant is in microsecond units, so when the speed is converted to revolutions per minute, it is equivalent to The difference value of the angle value is enlarged by 10 6 multiples, because the angle value signal is mixed with high-frequency noise, it is equivalent to synchronously amplifying the angle value noise by 10 during the speed calculation process. 6 multiples, which is extremely unfavorable for the speed loop control system. Aiming at this problem, the present invention proposes a speed-measuring magnetoelectric encoder based on multi-pair magnetic steel and auxiliary stator windings. In order to further improve the accuracy of angular velocity measurement, multiple pairs of The pole magnetic steel cooperates with the induction coil to obtain high-frequency induced voltage signals, and then performs data averaging processing to improve measurement accuracy

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