9 broken image fixed (click 'rendered output' to see the difference; image retrieved via Wayback Machine); for more info, see https://gist.github.com/Glorfindel83/9d954d34385d2ac2597bbe864466259f
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From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnetsFrom left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets
(source: wikimedia.org)
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets
(source: wikimedia.org)
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

8 replaced http://upload.wikimedia.org/ with https://upload.wikimedia.org/
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Four brushes motor, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Right_Motor_Internal.JPG/180px-Right_Motor_Internal.JPGFour brushes motor, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring.
Four brushes motor partially open, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. The brushes are made mainly from carbon, yet have other materials, the brush wear is visible on the contact ring

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets http://upload.wikimedia.org/wikipedia/commons/4/42/Brushed_dc_motor_dissembled.jpgFrom left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow. http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Stator_and_rotor_by_Zureks.JPG/320px-Stator_and_rotor_by_Zureks.JPGInduction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.
Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.

Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles. http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Stepper_motor.jpg/320px-Stepper_motor.jpgStepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.
Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.

Four brushes motor, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Right_Motor_Internal.JPG/180px-Right_Motor_Internal.JPG
Four brushes motor partially open, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. The brushes are made mainly from carbon, yet have other materials, the brush wear is visible on the contact ring

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets http://upload.wikimedia.org/wikipedia/commons/4/42/Brushed_dc_motor_dissembled.jpg
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow. http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Stator_and_rotor_by_Zureks.JPG/320px-Stator_and_rotor_by_Zureks.JPG
Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.

Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles. http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Stepper_motor.jpg/320px-Stepper_motor.jpg
Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.

Four brushes motor, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring.
Four brushes motor partially open, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. The brushes are made mainly from carbon, yet have other materials, the brush wear is visible on the contact ring

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.
Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.

Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.
Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.

7 added 2433 characters in body
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Four brushes motor, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Right_Motor_Internal.JPG/180px-Right_Motor_Internal.JPG
Four brushes motor partially open, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. The brushes are made mainly from carbon, yet have other materials, the brush wear is visible on the contact ring

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets http://upload.wikimedia.org/wikipedia/commons/4/42/Brushed_dc_motor_dissembled.jpg
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow. http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Stator_and_rotor_by_Zureks.JPG/320px-Stator_and_rotor_by_Zureks.JPG
Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.

DC brush-less motors have magnets in their rotor, so no electrical power supply is necessary to the rotor. Normally the magnets have high force to power ratio, see Neodymium magnets for example, and so the rotor1 has low mass and consequently low inertia. That said, it can start and stop at higher rates/accelerations than other motors with less wear.

Stepper-motors are a type of brush-less motor, but with more poles, that means that applying power to the correct phase you can presume the position of the rotor2. But the rotor can slip, called "lose step", and so you lost the position synchronism. That means that if use a stepper motor for precise positioning you need to be sure that the motor can handle the load and not slip. How can you be sure of the position? Put a position sensor on the axle of the motor, this with a controller turns it into a servo-motor.

Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles. http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Stepper_motor.jpg/320px-Stepper_motor.jpg
Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.

Gears, Hydraulics, chain sprocket, belts. There's more of course, and each of that have their subtypes. Ex: Gear reductions can be worm-gear, planetary, etc. On some applications you can use pulleys, like cranes, elevators.

All images courtesy of Wikimedia commons http://commons.wikimedia.org

DC brush-less motors have magnets in their rotor, so no electrical power supply is necessary to the rotor. Normally the magnets have high force to power ratio, see Neodymium magnets for example, and so the rotor1 has low mass and consequently low inertia. That said, it can start and stop at higher rates/accelerations than other motors with less wear.

Stepper-motors are a type of brush-less motor, but with more poles, that means that applying power to the correct phase you can presume the position of the rotor2. But the rotor can slip, called "lose step", and so you lost the position synchronism. That means that if use a stepper motor for precise positioning you need to be sure that the motor can handle the load and not slip. How can you be sure of the position? Put a position sensor on the axle of the motor, this with a controller turns it into a servo-motor.

Gears, Hydraulics, chain sprocket, belts. There's more of course, and each of that have their subtypes. Ex: Gear reductions can be worm-gear, planetary, etc. On some applications you can use pulleys, like cranes, elevators.

Four brushes motor, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. http://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Right_Motor_Internal.JPG/180px-Right_Motor_Internal.JPG
Four brushes motor partially open, showing its brushes and contact ring, and the mechanical commutation. The brushes are inside the "yellow" casing, that holds the brush with a spring to force it over the contact ring. The brushes are made mainly from carbon, yet have other materials, the brush wear is visible on the contact ring

From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets http://upload.wikimedia.org/wikipedia/commons/4/42/Brushed_dc_motor_dissembled.jpg
From left to right. Brushes of a small motor, rotor with contact ring and coils, stator and case with magnets

Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow. http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Stator_and_rotor_by_Zureks.JPG/320px-Stator_and_rotor_by_Zureks.JPG
Induction motor partially opened. The rotor, these small cuts in the metal form a low impedance coil, and case with its coils. The fins on the case help to dissipate the generated heat. Depending on the motor it normally have a fan attached to the axle, or use other motor for forced ventilation, for example the motor runs slow.

DC brush-less motors have magnets in their rotor, so no electrical power supply is necessary to the rotor. Normally the magnets have high force to power ratio, see Neodymium magnets for example, and so the rotor1 has low mass and consequently low inertia. That said, it can start and stop at higher rates/accelerations than other motors with less wear.

Stepper-motors are a type of brush-less motor, but with more poles, that means that applying power to the correct phase you can presume the position of the rotor2. But the rotor can slip, called "lose step", and so you lost the position synchronism. That means that if use a stepper motor for precise positioning you need to be sure that the motor can handle the load and not slip. How can you be sure of the position? Put a position sensor on the axle of the motor, this with a controller turns it into a servo-motor.

Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles. http://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Stepper_motor.jpg/320px-Stepper_motor.jpg
Stepper motor partially open. This is probably a hybrid type, with the rotor being magnetized and with gear like shape. Some steppers have round rotors, but the rotor is still magnetized with a high number of poles.

Gears, Hydraulics, chain sprocket, belts. There's more of course, and each of that have their subtypes. Ex: Gear reductions can be worm-gear, planetary, etc. On some applications you can use pulleys, like cranes, elevators.

All images courtesy of Wikimedia commons http://commons.wikimedia.org

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