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| group2:electrical_design 2008/12/09 16:27 | group2:electrical_design 2008/12/09 16:28 current | ||
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| - | The transistors in the above diagram are operated as a switch: when the base is saturated, it makes a path across the collector-emitter junction, and when it isn’t, this path is closed. The resistance of t[[http://example.com|External Link]]he stepper motor is 16.7Ω. With 5V supplied each coil draws 0.3A of current. A power transistor must be used in order to avoid damage to the equipment. The output of the micro controller is not enough to saturate the power transistors, and so a second set of regular transistors will be used to amplify the microcontroller output and saturate the power transistors. One regular transistor will be used to saturate transistors 01 and 04, a second one to saturate transistor 02 and 03, a third one to saturate transistors 05 and 08, and a fourth one to saturate transistors 06 and 07. | + | The transistors in the above diagram are operated as a switch: when the base is saturated, it makes a path across the collector-emitter junction, and when it isn’t, this path is closed. The resistance of the stepper motor is 16.7Ω. With 5V supplied each coil draws 0.3A of current. A power transistor must be used in order to avoid damage to the equipment. The output of the micro controller is not enough to saturate the power transistors, and so a second set of regular transistors will be used to amplify the microcontroller output and saturate the power transistors. One regular transistor will be used to saturate transistors 01 and 04, a second one to saturate transistor 02 and 03, a third one to saturate transistors 05 and 08, and a fourth one to saturate transistors 06 and 07. |
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