Example: If one electric motor (of any brand) has a total power of 50W and another motor (of a different model/brand than the first) also has a total power of 50W, is the power loss and heat generation of both motors the same or at least similar, despite a completely different model/manufacturer? And if there are significant differences, which motor factors play a role in achieving low power loss (good efficiency)?
(1 votes)
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This is only for engines same type/ same type and similar performance category (independent of the brand).
However, since there are many different types of motors, they are also very different in efficiency. For example, a split pole motor cannot be compared with an asynchronous motor.
The magnetic losses are primarily responsible for the losses, i.e. if the scattering field is large, the magnetic circuit is not closed clean everywhere, then the losses are higher.
The size is also important. Larger motors tend to be more efficient than small.
Definitely no.
What did they all vaccinate when the EU forced the vacuum cleaners.
So my old vacuum cleaner had >2kW, a lot of noise and was more a heater than a vacuum cleaner.
My now has 650W and pulls away much more without the unwanted heating function.
What else should this extreme difference come from if not from the engine?
A motor is an energy converter (power pure, kinetic energy out).
The art is to build such a transducer so that it converts as much as possible the pure energy into the desired energy (i.e. a high efficiency).
This has its price (pure materials, low gap dimensions, high-quality low-friction bearings, the wages of the developers who have planned the machine etc.)
A cheap engine “etected” again, consists of any recycled scrap iron with many impurities and material defects and in the copper for the coils was extended with aluminum. It is then not so good for efficiency. Stop cheap…
As you suspect, the heat losses in engines of the same type and the same power should be quite similar.
The Efficiency (ratio of useful power to supplied power) on the other hand generally increases with the power. In the case of small toy motors, this moves in the order of 0.7 to 0.8 and in the case of motors or Generators in the megawatt range (e.g. in power plants) near 0.99.