Steper Motor Driver System Principle Circuit

Published:2011/5/7 20:42:00 Author:Robert | Keyword: Steper Motor, Driver System | From:SeekIC

The steper motor driver system principle circuit is shown in the picture below. The AT89C2051 outputs the control pulses from the P1's P1.4~P1.7 port, then these pulse signals are phase inverted by the 74LS14 to enter 9014, after its amplification these signals then control the photoelectric switch. After optical isolation, the pulse signals' voltage and current are amplified by the power tube TIP122 and then drive the stepper motor every phase windings. It would make the stepper motor have the corotation, reversion, acceleration, deceleration and stop movement with differential pulse signals. L1 shown in the picture is one phase winding of the stepper motor. The AT89C2051 is chosen to use 22MHz crystal. The purpose of using the high-frequency crystal is minimizing the influences on the PC pulse signal cycles by the AT89C2051 in mode 2. The RL1~RL4 is winding resistance shown picture 1. The 50Ω resistance is a external resistance for current limiting, which is also a component to improve the loop circuit's time constant. D1~D4 are freewheeling diodes, which making the opposing electromotive force produced by motor winding be attenuated through them to protect the power tube TIP122 from damaged. If the 50Ω external resistance is in parallel with a 200uF capacitor, it would improve the front of the current pulses which are transmitted to the stepper motor to improve the high-frequency performance of the stepper motor.



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