What Is A Stator On A Motorcycle – If you clicked on this article, I imagine you have an electrical problem and you want to know what went wrong (and maybe you can fix it). If you’re not, congratulations on being active!
Your stator is the most important part of your bike’s electrical system. In simple terms, if you ride a modern bike, it has a lot of power requirements. The lights, ignition, fuel pump and starter all use different amounts of electricity. In simple terms, batteries provide this power. If the charging system does not show a star on the stator, the battery will die quickly. Think of your stator as the part that generates electricity to charge your battery to power all the electronic components on your bike.
What Is A Stator On A Motorcycle
“Stator” means “the magnet in the steel flywheel that distributes the AC power in a modern bike that normally burns out because the magnet in the steel flywheel doesn’t really wear out”.
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A “generator” can be a “cylinder driven indirectly by a gear (but sometimes driven by a belt) that outputs DC power and has an armature, commutator and permanent magnetic field coil inside. A separate set-up. The operator is located elsewhere.”
“Alternator” generally means “a belt- or chain-driven electrical unit that looks like the one in a car and consists of a stator, rotor, regulator, and rectifier all in one compact, high-output DC power supply.” at home.”
And “magneto” is usually “a self-contained thing on an old dirt bike or chopper that simplifies the wiring and makes it lighter, so you can leave the battery if the bike is equipped with a generator.”
As the above section indicates, you’ll hear the terms “generator,” “stator,” and “alternator” thrown around casually. All these items are used in motorcycles and they all perform the same function. Let’s take a quick trip through history and talk about the differences between them, including why you have a stator, how it differs from other devices that generate electricity – and why the jargon involved is a bit confusing.
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A magnet Think of it as a mechanically driven, self-contained box of sparks. This is an aftermarket magnet that was installed on a previous motorcycle that was once equipped with a timer, but the magnet was once an OEM part. Photo by Lemmy.
Very early motorcycles used a magneto (a small, separate structure driven by the engine) to generate the spark to provide the power needed by the spark plug. This minimal system worked because the motorcycles of the day did not have high power requirements. There were no lights then, or later, acetylene power.
However, the electric gigas were forced to go on motorcycles. Riders wanted better technology than today. For example, adding horns and electric lights, adding a battery and charging system has become almost a necessity. Batteries are charged by generators, a device that produces DC power. They do their job by rotating an armature, a part made of copper wires, in a constant magnetic field. (Generators actually produce AC power, but this is “rectified” or converted to DC by a commutator and brush internally.) Externally, generators rely on a “cutout relay” or switch that turns the gen from Disconnect the battery. High fees. When the battery drops below a set voltage, the switch closes again, allowing the genie to charge.
Fun fact: The field coils in a genie are technically a type of stator, as the stator represents the stationary part of the mo-shin that produces electricity.
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Until the early 1960s, most motorcycles were six-volt systems, but after that, many motorcycles began to sport 12-volt electrical equipment. The reason for this is mainly due to the increased engine power. The compression ratio was increased to create more powerful motorcycles. Starters need more power to spin engines, and higher voltages will help provide that power. Generators were then produced in 12V types for a short time.
Here is the six volt generator with the mounting bolts. As you can see, the unit has something of its own. Photo by Lemmy.
Generators on motorcycles are often a self-contained unit. They are very long and heavy, and on most motorcycles, they are located far away and are usually driven by a gear or belt. For most motorcycles, generators were replaced by alternators from the late 1960s to the 1970s.
A transformer, a type of generator, produces electricity by rotating a fixed piece of copper winding in (or around) a magnetic field (the “rotor,” the piece that performs the same function as the armature). Wire, remember? If you remember, it’s a flexible daisy-chain of sorts that people in the motorcycle world call a generator.
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This is the second part of the transformer, the rotor. See the black stuff around the outer perimeter? They are magnets. photo
In the motorcycle world, alternators produce AC power and are very efficient. Their packaging allows them to fit directly to the output shaft of the engine, which means great savings in weight, simplicity and assembly work. Most transformers (if not all, by a long shot) use a magnetic field instead of a permanent magnet like a generator. This means that the output varies and generally results in a stronger charge at slower engine speeds. The downside is that electricity is needed to generate power, so you have to run batteries on these bikes. (As a friend of mine said when I was writing this article, “You have to spend money to make money!”)
Since alternators produce AC power, it must be rectified by DC…you guessed it, a rectifier! A modern rectifier is a series of diodes that convert AC power to DC. After that, the power moves to the voltage regulator, which is ready for it? It regulates the voltage so it can be used to charge the 12V battery on your motorcycle.
Here we have the stator tucked inside the rotor. Here the part facing the camera is usually attached to the bike, and the rotor covers it. This is what you will see if you stand inside the engine. photo
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Note that these four parts – stator, rotor, regulator and rectifier – can be combined or separated. The stator and rotor are usually rotated by the cheek because one must rotate the other. A stator and rotor together form a transformer, which is a type of generator. Crystal clear, right?
Crash and rack are often grouped together, but the two items can live separately – and swap works well on motorcycles because it allows for easier assembly by “puzzle” engineers. A system like this with a separate rec/rec box is usually called a “stator”.
Some bikes, especially touring machines, use a version of the system where everything is housed in one unit, commonly called an alternator. Although the previous system we discussed was a complete replacement, this design in the motorcycle world is often reserved for an “all-in-one” package.
Now that you’ve covered this history, you know what the terms really are. Now, if someone tells you that their stator has blown, you will know that they took a day to charge the battery, assuming they actually have a stator. If not, can you explain why?
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WTATWTA: Why Small Engines Can Make More Power Than Big Engines Lemmy WTATWTA: What is exhaust spark ignition and do I need it? Lemmy This is a quick (but detailed) guide on how to test the motorcycle charging system of any motorcycle – whether you’ve bought one or own one.
The motorcycle charging system is actually quite simple. Once you understand how a motorcycle’s charging system works and what can go wrong with it, troubleshooting is easy.
As faults are not uncommon, knowing how to fix the charging system can mean the difference between getting 200km home or being stuck in the middle of nowhere.
It could also mean avoiding a lump sum purchase or dropping $500 off the asking price of the bike.
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Well, I am. That’s why I created this site – a shop. I like to learn and share things that are useful to others. If you like what you read here, and you’re crazy like me, you might want to know when I post more. (See the last one for an idea of what you’ll see.)
In short, there are only five main electrical components in a motorcycle’s charging system (and they usually fail).
When something doesn’t work in your motorcycle’s charging system, one of these components has failed. Figuring out what failed is the important part.
Often, when asked about motorcycle charging systems on forums, people say “dead battery” and give examples.
Tutorial: Motorcycle Wiring 101
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