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 291 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.
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