Most starter motors are located in the bell housing. They mesh with the ring gear fitted to the engines flywheel. Starter motors are cylindrical in shape and are about 9" in length
"Induction" motors imply AC power Most AC motors do not have brushes or commutator If your motor does have brushes, a lot of sparking where the brushes meet the comutator is a good indication that it needs to be cleaned and/or "cutdown". If your motor does not have brushes, then you have more serious trouble. Need more details
The most common use of brushes and commutators these days are in universal motors. This type of motor is used in hand tools like drills, saws, and home motor driven appliances
Most of the motors are usually controlled by the soft starters which usually trip frequently. One of the steps in find why the soft starter has tripped is looking at the motor circuit protector rating.
There are different varieties of chimney brushes available for different chimney types. The two basic types of chimney brushes are wire brushes and polypropylene brushes.
most automatic vehicles and many other things
Not much, yet. Homopolar motors work on a principle called the Lorentz force law, the same principle that makes a rail gun work. They are the most basic and conceptually simple rotary electric motors possible. You may also see them referred to as Faraday Disks, or unipolar motors. Because they are so simple, they have the potential to be very efficient, but unlike AC (alternating current) induction motors, AC synchronous motors, or DC (direct current) brushless motors (the latter two are essentially the same), they require brushes, and therefore more maintenance. They also tend to work at low voltage and high current, which makes the brushes more lossy. My best guess is the problems with the brushes are why homopolar motors appear to have never found any commercial or military applications. However, a quick search on google will show that the Navy is interested in using them on ships and subs. Because they are the only truly DC motor, they should prove to be quieter than any other electric drive option they are considering. AC motors come with a lot of noise, just ask your washing machine.
Hair brushes don't make anybody go bald and hair brushes are much better than combs as the brushes have open bristles.The brushes have broad surface which cover most of the hair.
synthetic brushes are make-up brushes that are made from man made fibres for bristles so they are also cruelty free, unlike most make brushes which made from animal hair and made by plucking the animals hair out and putting them into brushes.
Kent brushes is probably the most well know and best brush making company, but there are many other companies that make them as well such as Yong Tai Shing and Twitchell.
Assuming you mean electric motors, the causes for failure include seized bearings and worn brushes. If the bearings or bushings are seized, the motor may fail. Most electric fans have thermal fuses, so if the motor seizes and overheats, the fuse blows. If the brushes are worn, then the motor is no receiving electricity and thus cannot turn.
The starter is just a DC motor so the motor gets dirty inside or the armature and brushes wear. If the battery is good and yet you just hear a click or nothing or even the starter spinning, the next most likely cause is the starter motor. They are cheap to replace yourself, though the job is a little tight. See wikianswer on 1993 Ford Escort for the process.