[PSUBS-MAILIST] PWM controllers

[Alan via Personal_Submersibles]

Hank,
tutorial on torque & speed!
http://lancet.mit.edu/motors/motors3.html
another on understanding gearbox design
http://www.instructables.com/id/Understanding-Motor-and-Gearbox-Design/
In a nut shell your maximum power is at about half your no load speed.
So run the motor with no load & check the rpm of the output shaft with a tachometer, then check the rpm under load to make sure it is around half of the no load rpm.
So in your case if the rpm under load was half the no load speed it would be close to the
motors rated power.
Cheers Alan

Sent from my iPad

> On 5/10/2017, at 9:24 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> If I have a 1\4 hp motor and I have the controller turning the motor at say 50 rpm, is the motor giving me 1\4 hp at 50 rpm?
> Hank
> 
> On Wednesday, October 4, 2017, 1:33:59 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hi Hank,
> yes. If you have your speed controller on full speed there would be no
> pulsing of the power to the motor, it would be fully on.
> You can have full power & no rpm in a stall situation. Most modern
> controllers I have seen have current limiting that you can program in;
> so in a stall or overloaded situation it would back off the power.
> Alan
> 
> 
> Sent from my iPad
> 
>> On 5/10/2017, at 7:56 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Hi All,
>> When a dc motor is speed  controlled with a PWM controller is the motor at full power regardless of rpm?
>> Hank
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