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General Mach Discussion / Re: running unipolar stepper motor with TIP120
« on: June 26, 2010, 12:30:03 AM »
hi
thanks for your reply. but how is more batter to use diodes? Please what mean by "reverse biased for the back EMF". And again i am asking about the measures to protect the transistors from being burnt as described in following sentence.
"The diodes are a feature typical of circuits that handle magnetic coils, that is inductive circuits. In this context, the motor windings are the inductive element. Capacitors provide a means for the storage of electrical charge, inductors provide a means for storage of electrical current. The driving current causes a magnetic field to be built up in the coil. As soon as the drive is removed, the magnetic field collapses and causes the inductor to release its stored current. Semiconductors are particularly sensitive to these currents (they briefly become conductors and then become permanent nonconductors!). The diodes provide a mechanism to safely shunt these currents away and, thus, protect the transistors and the computer."
how the motor coil's conman wire and the four diodes wires will be used.
thanks for your reply. but how is more batter to use diodes? Please what mean by "reverse biased for the back EMF". And again i am asking about the measures to protect the transistors from being burnt as described in following sentence.
"The diodes are a feature typical of circuits that handle magnetic coils, that is inductive circuits. In this context, the motor windings are the inductive element. Capacitors provide a means for the storage of electrical charge, inductors provide a means for storage of electrical current. The driving current causes a magnetic field to be built up in the coil. As soon as the drive is removed, the magnetic field collapses and causes the inductor to release its stored current. Semiconductors are particularly sensitive to these currents (they briefly become conductors and then become permanent nonconductors!). The diodes provide a mechanism to safely shunt these currents away and, thus, protect the transistors and the computer."
how the motor coil's conman wire and the four diodes wires will be used.