Running DC motor at higher than rated speeds

AI Thread Summary
Running a DC motor at speeds exceeding its rated RPM, such as 2500 RPM for a motor rated at 1500 RPM, is possible due to the influence of voltage and load conditions. When operated without a load, the motor's speed is determined by the average voltage supplied, which can be increased beyond the rated specifications. Additionally, the motor's speed rating is contingent upon specific voltage and load parameters, which, if altered, can lead to higher speeds. This phenomenon highlights the importance of understanding the relationship between voltage, load, and motor performance. Proper control and monitoring are essential to avoid potential damage when exceeding rated speeds.
zaman999
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Hi,
I had this power electronics lab experiment where we control the speed of a separately excited dc motor using thyristors. The dc motor is rated at 1500 RPM but we do get readings where the speed is above 2500 RPM. How is that possible?

Thanks
 
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Without a load a DC motor will run at a speed determined by the average voltage provided. The motor speed specification also specified voltage and load. You have changed the voltage or load from those specified for that RPM.
 

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