Stepper Motor Circuits - Revision history

JeremyDarling: /* Bipolar Stepper Driver Circuit */

2008-02-26T23:57:28Z

Bipolar Stepper Driver Circuit

2006-08-09T18:28:49Z

L297

2006-08-09T18:28:19Z

Bipolar Stepper Driver Circuit

2006-07-27T20:32:08Z

2006-07-27T20:24:17Z

Unipolar Stepper Driver Circuit

2006-07-27T15:36:18Z

Unipolar Stepper Driver Circuit

2006-07-05T23:38:22Z

L297

2006-07-05T23:27:01Z

Indexing

2006-07-03T16:44:00Z

Unipolar Stepper Driver Circuit

2006-07-03T16:43:43Z

Unipolar Stepper Driver Circuit

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 ===Bipolar Stepper Driver Circuit===
-Bipolar stepper drivers use H-bridges to energize the windings of the motor.  H-bridges allow you to chose the direction of the current through the winding.  Using an H-bridge configuration, there are four transistors for each winding as shown in the first figure below.  However, most of the time they are prewired together so that only two inputs are needed.  This makes generating pulses easier and also serves to protect against short circuits.  This circuit is shown in the second figure below.
+Bipolar stepper drivers use H-bridges to energize the windings of the motor.  H-bridges allow you to choose the direction of the current through the winding.  Using an H-bridge configuration, there are four transistors for each winding as shown in the first figure below.  However, most of the time they are prewired together so that only two inputs are needed.  This makes generating pulses easier and also serves to protect against short circuits.  This circuit is shown in the second figure below.
 {| align="center"

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 '''Digikey Part #: 497-1394-5-ND'''
-The L297 is a 20-pin DIP chip that was designed specifically to control either unipolar or bipolar stepper motors.  It will control two H-bridges to power two windings.  Its inputs control the speed and direction of the motor.  The diagram below shows the typical setup of the circuit.  The A and B outputs would correspond to the X and Y inputs on the H-bridge of the first winding (see above).  Likewise, the C and D outputs would correspond to the X and Y inputs on the second winding.
+The [[media:L297.pdf|L297]] is a 20-pin DIP chip that was designed specifically to control either unipolar or bipolar stepper motors.  It will control two H-bridges to power two windings.  Its inputs control the speed and direction of the motor.  The diagram below shows the typical setup of the circuit.  The A and B outputs would correspond to the X and Y inputs on the H-bridge of the first winding (see above).  Likewise, the C and D outputs would correspond to the X and Y inputs on the second winding.
 [[image:l297.png|center]]

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 |}
+You should be able to drive a bipolar motor with a unipolar motor circuit.  The only difference is that there are no center winding taps to connect to the power source.  Somebody correct me?
 ==Indexing==

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 ===[[PIC16F684]]===
-The PIC16F684, which is available in the lab, is a good programmable microcontroller ideally suited for controlling a bipolar stepper motor.
+The PIC16F684, which is available in the lab, is a good programmable microcontroller ideally suited for controlling stepper motors.
 [[media:PIC Stepper Control.pdf|Read this document]]

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 [[image:ds2003.png|center|300px]]
-Another chip, capable of 700mA/winding is the [[media:2559.pdf|UDN2559B (pdf)]] (Newark Part #: 91F9975) made by [http://www.allegromicro.com/ Allegro Microsystems].
-[[image:2559.png|center]]
 ===Bipolar Stepper Driver Circuit===

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 [[image:unipolar switch circuits.jpg|center]]
-For driving a full stepper motor, with multiple coils, you can either build each of the above circuits individually, or you can use a integrated chip.  One such chip is the DS2003, which is a darlington array, and is shown below.  This chip can be used when the total current to each winding is less than 500 milliamps.
+For driving a full stepper motor, with multiple coils, you can either build each of the above circuits individually, or you can use a integrated chip.  One such chip is the [[media:DS2003.pdf|DS2003]], which is a darlington array, and is shown below.  This chip can be used when the total current to each winding is less than 500 milliamps.
 [[image:ds2003.png|center|300px]]