By Douglas W Jones; University of Iowa. Dept. of Computer Science
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Additional info for Control of stepping motors : a tutorial
A voltage significantly above the supply voltage, and the switch must be able to tolerate this voltage. To solve for the size of the capacitor, we equate the two formulas for the stored energy in a resonant circuit: P = C V2 / 2 P = L I2 / 2 Where: P -- stored energy, in watt seconds or coulomb volts C -- capacity, in farads V -- voltage across capacitor L -- inductance of motor winding, in henrys I -- current through motor winding Solving for the minimum size of capacitor required to prevent overvoltage on the switch is fairly easy: C > L I2 / (Vb - Vs)2 Where: Vb -- the breakdown voltage of the switch Vs -- the supply voltage Variable reluctance motors have variable inductance that depends on the shaft angle.
13 Here, the following operating modes are available: XY ABCD 00 01 10 0000 1001 0110 11 0101 Mode fast decay forward reverse slow decay The advantage of this arrangement is that all of the useful operating modes are preserved, and they are encoded with a minimum number of bits; the latter is important when using a microcontroller or computer system to drive the H-bridge because many such systems have only limited numbers of bits available for parallel output. Sadly, few of the integrated H-bridge chips on the market have such a simple control scheme.
The 7407 buffer used to drive the darlington may be replaced with any high-voltage open collector chip that can sink at least 10 milliamps. In the event that the transistor fails, the high-voltage open collector driver serves to protects the rest of the logic circuitry from the motor power supply. 7 is a power field effect transistor. This can handle currents of up to about 20 amps, and it breaks down nondestructively at 100 volts; as a result, this chip can absorb inductive spikes without protection diodes if it is attached to a large enough heat sink.
Control of stepping motors : a tutorial by Douglas W Jones; University of Iowa. Dept. of Computer Science