[PSUBS-MAILIST] PWM controllers

[hank pronk via Personal_Submersibles]

 Thanks AlanHank
    On Wednesday, October 4, 2017, 3:28:06 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank,tutorial on torque & speed!http://lancet.mit.edu/motors/motors3.htmlanother on understanding gearbox designhttp://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 themotors rated power.Cheers Alan
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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 nopulsing of the power to the motor, it would be fully on.You can have full power & no rpm in a stall situation. Most moderncontrollers 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

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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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