No edit summary |
|||
Line 35: | Line 35: | ||
* No --> types: variable frequency drive (http://en.wikipedia.org/wiki/Motor_controller#Variable_frequency_drives ), Adjustable speed drive (http://en.wikipedia.org/wiki/Adjustable_speed_drive ), ... | * No --> types: variable frequency drive (http://en.wikipedia.org/wiki/Motor_controller#Variable_frequency_drives ), Adjustable speed drive (http://en.wikipedia.org/wiki/Adjustable_speed_drive ), ... | ||
==Applications== | ==Applications== | ||
* DC brushed motor (or DC pancake motor): useful for domestic applications (ie powering washing machines, dishwashers) | * DC brushed motor (or DC pancake motor): useful for domestic applications (ie powering washing machines, dishwashers) | ||
* AC | * AC induction motor (squirrel cage rotor, type ?): useful for | ||
==3D models== | ==3D models== |
Revision as of 10:16, 1 February 2011
This article deals about the differences between electric engines and the most appropriate forms for particular tasks.
Basic design of electric engines
Types
Electric motors can be divided into 3 main types: alternating current (AC) motors, direct current (DC) motors, and universal motors. An AC electric motor will not run when supplied with DC current, and a DC motor will not run on AC current; a AC/DC motor will however run on either AC or DC current.
Subtypes:
- AC electric motors: Induction motor (squirrel cage rotor), Induction motor (slip ring rotor), Induction motor (solid core rotor), Shaded pole motor, ...
- DC electric motors: Pancake DC motor, Brushed DC electric motor, Brushless DC electric motor, Stepper DC motor, ...
- AC/DC motors: Universal motor
AC & DC motors
One of the main differentiation we can make between the engines is on whether they use AC or DC power. Surprisingly however, in practice, this doesn't really matter that much since the engines are so different on regards to weight, efficiency, durability, ... There for example isn't a "AC" version of the Brushed or Brushless DC engine, ... Instead, each engine is different, and is most suitable to a specific type of application.
1, 2 or 3-phases
Another differentiation can be made on regards to 1, 2 and 3-phase engines. In general, most engines can be made in 1, 2, and 3-phases, so the phases refer to the subtype of engine, and not an engine category on its own.
The way on how the engine is different lies in how the electromagnets (poles) are made. With 1 phase engines, there is 1 wire making the poles (arranged in series). With 2 phase, there are 2 wires, and with 3-phase, there are 3.
The difference lies in that the rotation speed of the engine (and hence the power output) can be regulated to a greater extent (although this also depends on the type of electric engine used). With 3-phase engines, it may be possible to eliminate a gearbox in some situations. The same can however also be done with a controller (ie with Brushless DC engines), pulse width modulator (ie with Pancake DC, ...), or variable frequency source.
Another difference is that the more phases, the greater the total power output can be (more powerful engines are possible), the more power the engine has compared to its size/weight, and (possibly) the greater the efficiency. The tradeoff is however the increased complexity of building and increased cost (the latter depending again on the type of engine chosen).
Finally, a last benefit is reduced power loss over electricity lines (connected to the engine). The latter however is only of importance if the power source is very far away.
In general, we must see the required power output of the engine, the application where the engine is to be used for, and the type of engine used in the first place; only then can we assess whether it's useful to have 2/3-phases or not.
Requirement of clutch + gearbox ?
- Yes --> types:
- No --> types: variable frequency drive (http://en.wikipedia.org/wiki/Motor_controller#Variable_frequency_drives ), Adjustable speed drive (http://en.wikipedia.org/wiki/Adjustable_speed_drive ), ...
Applications
- DC brushed motor (or DC pancake motor): useful for domestic applications (ie powering washing machines, dishwashers)
- AC induction motor (squirrel cage rotor, type ?): useful for
3D models
- 3D model to get started from: http://sketchup.google.com/3dwarehouse/details?mid=eac1f5c7bb8c1dd2ca4497de53d2d8eb
- Induction motor (=bird cage motor, asynchronous induction motor) model to get started from: http://en.wikipedia.org/wiki/Induction_motor
- R160A traction motor ? http://en.wikipedia.org/wiki/R160_(New_York_City_Subway_car)#Features -->= bird cage motor / asynchronous induction motor ? (http://www.youtube.com/watch?v=TXUWXgqEvXo&feature=related )
- http://en.wikipedia.org/wiki/File:Electric_motor_cycle_1.png
- http://www.youtube.com/watch?v=Q2mShGuG4RY&feature=related youtube models
- http://www.youtube.com/watch?v=Xi7o8cMPI0E&NR=1&feature=fvwp
- http://www.youtube.com/watch?v=7tEsJ-xAoEQ&feature=related youtube model 2
- http://www.youtube.com/watch?v=VNEdVUEmXTg&feature=related youtube model 3
- http://www.youtube.com/watch?v=wbmiNMse7J0&feature=related
- http://www.youtube.com/watch?v=ZRGlAu0uCHY&feature=related
- http://www.youtube.com/watch?v=Lv9_04UlV4s&feature=related
- http://www.youtube.com/watch?v=8zQamTIVlnY&feature=related
- http://www.youtube.com/watch?v=bXhDlKmBQRY&feature=related Ryobi Universal motor
- http://www.youtube.com/watch?v=RAc1RYilugI&feature=related PCBHeaven DC motor animation
- http://www.youtube.com/watch?v=RAc1RYilugI&feature=related TutorVista DC motor animation
- http://www.youtube.com/watch?v=AHSX7ffX70c&feature=related asynchronous induction motor -->motortype 3D model discovery channel
- http://www.youtube.com/watch?v=nCkz3YubMSc&feature=related Triphase electric engine
- http://www.youtube.com/watch?v=LrhHbqC_Ups&feature=related
- http://www.youtube.com/watch?v=8zQamTIVlnY&feature=related Video with schematics 3-phase engine
- http://www.youtube.com/watch?v=B8z4tHMBn4Q&feature=related triphase engine