On Monday, October 7, 2019 at 7:04:48 PM UTC-4, wrote:
Hi Comrades, please what is the simplest way to reduce the speed of a single phase induction motor to about 50%?
also can a universal motor run for 24 hours on 90% load? (with all name plate ratings observed)
thank you.

What we would need is horsepower, operating voltage, then anticipated maximum load.

https://cdn.automationdirect.com/ima.../l_gs110p5.jpg

These exist, but as the load increases, so does the cost.

As to operational capacities, if the motor is rated as "continuous" and properly cooled, there should be no issue about how long it runs as long as it is within its design load. NOTE: "Design Load" is generally some amount less than "Maximum Load". But not too much, typically around 10% - so you need to know which "90%" you are measuring.

https://www.plantengineering.com/art...s-actual-load/

Gives you more on the subject.

Peter Wieck
Melrose Park, PA