Topic: Will variable speed controls reduce the motor mixing speed to my desired specs?29 July 2013 Last edited: 29 July 2013 At 10:15am
Dave Dickey Forum Moderator 275 Posts
Re: Will variable speed controls reduce the motor mixing speed to my desired specs?29 July 2013 at 10:15am Last edited: 30 July 2013 at 11:09am
If you want to operate your mixer between 100 and 200 rpm, you can't do it with a fixed speed motor and a variable speed control. The best variable speed controls will not effectively reduce the speed more than about 4:1, not the "advertised" speed reductions of 10:1. Even if you were able to reduce speed by a 10:1 factor, the motor can never deliver more than constant torque. So a one hp motor with a 10:1 speed reduction could never deliver more than 0.1 hp.
You need a motor with a gear box. A typical single-reduction gear box would give you a 5:1 speed reduction, which should be able to get your 100 to 200 rpm with a variable speed control. Be sure that your impeller size is appropriate for that speed range. A 2:1 speed range may give you a 32:1 power range.
The answers by this expert are based on the best available interpretation of the information provided. The consequences of the application of this information are the responsibility of the user. If clarification is needed, please submit a further question.