Stepper Motor Controller


Posted on Feb 5, 2014

Stepper motors are available in several versions and sizes with a variety of operating voltages. The advantage of this general-purpose controller is that is can be used with a wide range of operating voltages, from approximately 5 V to 18 V. It can drive the motor with a peak voltage equal to half the supply voltage, so it can easily handle steppe


Stepper Motor Controller
Click here to download the full size of the above Circuit.

r motors designed for voltages between 2. 5 V and 9 V. The circuit can also supply motor currents up to 3. 5 A, which means it can be used to drive relatively large motors. The circuit is also short-circuit proof and has built-in over temperature protection. Two signals are required for driving a stepper motor. In logical terms, they constitute a Grey code, which means they are two square-wave signals with the same frequency but a constant phase difference of 90 degrees. IC1 generates a square-wave signal with a frequency that can be set using potentiometer P1. This frequency determines the rpm of the stepper motor. The Grey code is generated by a decimal counter in the form of a 4017. Outputs Q0 Q9 of the counter go high in succession in response to the rising edges of the clock signal. The Grey code can be generated from the outputs by using two OR gates, which are formed here using two diodes and a resistor for each gate, to produce the I and Q signals. Here I` stands for in-phase` and Q` for quadrature`, which means it has a 90-degree phase offset from the I signal. It is common practice to drive the windings of a stepper motor using a pair of push-pull circuits for each winding, which is called an H bridge`. That makes it possible to reverse the direction of the current through each winding, which is necessary for proper operation of a bipolar motor (one whose windings do not have centre taps). Of course, it can also...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Voltage Controlled Panner
    Active SubWoofer
    Advanced Telephone Intercom
    Electronic-bagpipe
    Low Noise And Drift Composite Amp Circuit
    connect 4000
    Lite + Xtall RX V9.0 Schematic
    Bat Feed GO
    Micro Flasher
    99 nissan sentra
    Dual-phase power switchover circuit schematic



    Top