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Figure 4-2 in 4 showed the interaction of forces around a wire carrying a current. In that gure, the magnetic ux is owing into the page, the electrical current is moving from right to left, and the wire is being pushed down. Figure 11-4 illustrates the same idea showing the physical magnets. Note that the magnetic eld points from the North pole to the South pole. As current is applied to the wire it generates its own eld which interacts with the ux around it, pushing the wire up. If you make your wire into a loop and run it back and forth between the magnets, the forces push up on one side and down on the other side of the loop (Fig. 11-5), creating a turning force or torque on the wire. Finally, instead of a single wire you can create coils of wire around a soft iron core

After you are finished constructing the test circuit, program the PIC with the following BASIC program. The program is kept small

FC-3 defines generic services available to all nodes attached to a SAN fabric. Some of the services include login server, name sever, management server, and time server, among others, depending on the vendor.

Fig. 11-3.

Q1 Q2 On On Q3 On Q4 On Port B Output (decimal) 1 2 4 8

Fig. 11-4.

and simple to show how easy it is to get a stepper motor moving. Table 10.3 shows that each step in the sequence turns on one transistor. Use Table 10.3 to follow the logic in the PICBASIC program. When you reach the end of the table, the sequence repeats starting back at the top of the table.

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Fig. 11-5.

Stepper Motor Controller Symbol TRISB = 134 Symbol PortB = 6 symbol ti = b6 ti = 25 start: pause ti pause ti pause ti pause ti goto start Poke TRISB,0 poke portb,1 poke portb,2 poke portb,4 poke portb,8 Initialize TRISB to 134 Initialize portb to 6 Initial ti delay Set PORTB lines output Step 1

and the eld increases hundreds or thousands of times and you get some serious force out of your motor. That is what you will see if you look inside a motor. The ring of permanent magnets around the outside of the motor s case is called the stator, because it is static (it doesn t move). The stronger these magnets are, the more powerful

2

Set delay to 25 ms Forward rotation sequence Delay Step 2 Step 3 Step 4 Do again Delay Delay Delay

your motor can be. The wire-wrapped loops and their metal core that spins inside of those magnets is called the rotor, because it rotates. Electricity is applied through a rotating switch called the commutator, because it helps the electricity commute, or travel. The electrodes of this switch are spring-loaded contacts or brushes. When electricity is applied to the coil, the coil s magnetic eld pushes against the static eld and makes the rotor turn until the rotor s magnetic eld is back in line with the stator s magnetic eld. And then it stops. This is where the commutator comes in. As the rotor turns, the commutator acts like a DPDT switch and reverses the current through the coils just as they are coming in line with the stator s eld. This reverses the coil s eld, pushing the rotor against the new magnetic alignment and the process repeats until the motor wears out.

One rotation Using whole steps, the stepper motor requires 200 pulses to complete a single rotation (360 degrees/1.8 degrees per step). Having the PIC microcontroller count pulses allows it to control and position the stepper motor s rotor.

When you put electricity into a motor it spins. What happens if you grab the rotor of a motor and turn it by hand Electricity comes out. This, then, is a generator. Motors and generators are essentially the same thing. There are subtle di erences in construction that make motors more e cient at creating torque and generators more e cient at creating electricity, but their basic construction is the same.