Stepper motor power-outage displacement recovery device and method

Abstract

A stepper motor power-outage displacement recovery device comprises a power source, a super capacitor, an ARM controller, a FRAM ferroelectric memorizer and an encoder. When a system works normally, the power source simultaneously supplies power to the ARM controller, the FRAM ferroelectric memorizer and the encoder, and charges the super capacitor. If the power source supplies power normally, the ARM controller does not send any command, stepper motor displacement information is directly passed to the ARM controller by the encoder. In case of a power failure, the super capacitor supplies power in a short time, the ARM controller immediately sends a storage command, the FRAM ferroelectric memorizer instantaneously reads and saves the pre-power-outage stepper motor displacement information from the encoder. When the power source recovers power supply, the ARM controller reads and recovers the pre-power-outage stepper motor displacement information from the FRAM ferroelectric memorizer. The stepper motor power-outage displacement recovery device has the advantages of simple structure, high performance cost ratio, wide application range, wide temperature range, high reliability and long service life, and is particularly suitable for frequent power-down occasions.

Description

technical field [0001] The invention relates to a stepping motor control system, in particular to a device and method for recovering motor displacement information after a stepping motor is powered off, and belongs to the technical field of stepping motors. Background technique [0002] A stepper motor is usually used in conjunction with an encoder to obtain the actual displacement of the stepper motor through the encoder. Encoders can be divided into incremental encoders and absolute encoders. Each position of an absolute encoder corresponds to a certain digital code, so it has the advantages of high data reliability and no loss of position information after power failure. Usually the total number of laps is limited and expensive, so it is not widely used at present. For incremental encoders, the position information is determined by the number of pulses counted from the zero mark. Therefore, when the power is turned off, if the displacement information of the motor is no...

AI Technical Summary

Problems solved by technology

However, this method is only suitable for systems with a small structure, and at the same time increases the risk of system failure caused by zeroing faults. In addition, the complexity of the system structure and the overall cost will also be greatly increased.

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