Digital trusted instrument with CAN interface

Abstract

The invention provides a digital trusted instrument with a CAN interface. An external mechanical rotation angle variation quantity is transferred to a second automatic angle adjusting machine, and a fine channel angle digital quantity is obtained through an SDC module. The external mechanical rotation angle variation quantity is transferred to a first automatic angle adjusting machine through a speed reducer, and a coarse channel angle digital quantity is obtained through an SDC module. The coarse channel angle digital quantity and the fine channel angle digital quantity are subjected to coarse and fine combined operation of a single chip microcomputer, and a 17-bit trusted instrument position digital quantity is obtained. The trusted instrument position digital quantity is transmitted to a servo controller by a CAN bus driver module through a CAN data bus. A power supply module supplies power to the SDC modules, the single chip microcomputer and the CAN bus driver module. According to the digital trusted instrument, the direct influence on precision by excitation power supply interference is small, the conversion precision is ensured, and the calculation workload of a servo control computer is reduced.

Description

technical field [0001] The invention belongs to an angle sensor product and relates to a servo system. Background technique [0002] The angle position sensor commonly used in the follow-up system is the receiver. The working principle of the traditional receiver is to transmit the external rotation angle change signal to the receiver through the mechanical transmission, and transmit the mechanical angle change (or the speed conversion through the reducer) to the self-aligning machine (or the rotation angle) inside the receiver. Transformer), converted into 3-phase (same phase and different amplitude) AC analog signal output, and transmitted to the servo controller through the signal transmission cable, and the servo controller converts the 3-phase AC analog signal into an angle digital signal through SDC conversion . Because the accuracy of a single auto-alignment machine (or resolver) is not enough, two resolvers are required to measure with different speeds, and then th...

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Problems solved by technology

[0004] 1) The accuracy of the excitation power supply of the self-aligning machine (or resolver) directly affects the accuracy of angle measurement, and the excitation power supply line is too long, which is prone to interference and affects the accuracy

[0005] 2) The output 3-phase AC analog signal, because the output analog signal power is small, the transmission distance is long, the deformation is serious, and the accuracy is affected

[0007] 4) It is necessary to perform rough and fine combined calculations inside the servo controller, which increases the calculation workload of the servo control computer

[0008] 5) Coarse and fine corrections to zero are required in the combined calculation of coarse and fine, which increases the debugging workload of the servo control computer

[0009] 6) The receiver only realizes part of the functions of the sensor, it is difficult to check and accept the accuracy, and it is difficult to measure

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