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Fizzics
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...Up to 300 rpm (3 phase motor) and what sort of efficiency could I expect under normal conditions with a small load? Thanks
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Fizzics said:...Up to 300 rpm and what sort of efficiency could I expect under normal conditions with a small load? Thanks
wiki said:Full load motor efficiency varies from about 85% to 97%, related motor losses being broken down roughly as follows:[39]
Various regulatory authorities in many countries have introduced and implemented legislation to encourage the manufacture and use of higher efficiency electric motors. There is existing and forthcoming legislation regarding the future mandatory use of premium-efficiency induction-type motors in defined equipment. For more information, see: Premium efficiency and https://en.wikipedia.org/w/index.php?title=Copper_in_energy_efficient_motors&action=edit&redlink=1 .
- Friction and windage, 5% – 15%
- Iron or core losses, 15% – 25%
- Stator losses, 25% – 40%
- Rotor losses, 15% – 25%
- Stray load losses, 10% – 20%.
The efficiency of a motor is the ratio of its output power to its input power. At low RPM, the efficiency of a 1kw motor can vary depending on factors such as the design, quality, and load applied. However, on average, a well-designed 1kw motor can have an efficiency of around 80-90% at low RPM.
The type of motor can greatly affect its efficiency at low RPM. For example, a brushed DC motor typically has a higher efficiency at low speeds compared to a brushed AC motor. On the other hand, a permanent magnet synchronous motor (PMSM) can maintain a high efficiency at both low and high RPMs.
Generally, a motor with a larger number of poles and a lower winding resistance tends to have a higher efficiency at low RPM. This is because these characteristics allow the motor to produce more torque with less power loss, resulting in a more efficient operation.
Yes, the load applied to a motor can greatly affect its efficiency at low RPM. The efficiency of a motor is typically highest at its maximum load capacity. However, if the load is too low, the motor may not be operating in its optimal range, resulting in a decrease in efficiency.
Yes, there are other important factors to consider when choosing a 1kw motor for low RPM applications. These include the motor's size, weight, cost, reliability, and compatibility with the desired power source and control system. It is important to evaluate all these factors to ensure the chosen motor will meet the specific needs of the application.