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Inductance and Magnetism
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Fig. 11-4.
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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
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CHAPTER 11 Inductance and Magnetism
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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.
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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.
Magic motors
Try This: If you hook two motors together, when you turn one of them by hand, the other one turns by magic (Fig. 11-6). Well, by electricity, though Sir Arthur C. Clark once said that any su ciently advanced technology is indistinguishable from magic. The di erence is in how well we understand what we are seeing.
SERVOS AND STEPPERS
The system shown in Fig. 11-6 is a form of servomechanism, or servo. A servo is a system that provides controlled motion at a distance, typically using feedback. The generator/motor pair is crude, but the output motor does mirror any motion from the input generator. A true servo system would mirror the input position even in the face of resistance, using an internal
Inductance and Magnetism
Fig. 11-6. Motor as generator.
feedback loop to measure the actual position and update the mechanism as needed. Radio-controlled vehicles of all kinds rely on servos to control their steering and throttle. These R/C servos consist of a tiny motor and gear train, a feedback sensor on the output shaft, and a circuit to control it all. The servo is given power and a control signal, and the circuit uses feedback from the position sensor to keep the output shaft at the commanded position. Servos are handy because they move the feedback circuit into the motor itself. This is like taking a control function out of the brain and putting it into a neural re ex. The re ex loop is shorter and faster, and it can happen without having to bother the higher-level systems. A stepper motor is a motor that moves in short, controlled steps instead of in a continuous spin. In a continuous motor, the commutator reverses the current to provide constant rotation. A stepper motor doesn t do that for you. An external circuit is needed to reverse the elds and cause the next step. Stepper motors are good for accurately positioning the motor and then holding that position. Stepper motors are often used in robots because of this ne level of control.
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