Re: [CAD_CAM_EDM_DRO] Re: Cap at the Gecko, motor heating, fuse protection??

turbulatordude wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
><polaraligned@o...> wrote:
>
>
>>
>>So what are your personal thoughts on running a motor over it's
>>rated voltage? Does is not matter then because the Gecko limits
>>the current?
>>
>>Thanks,
>>Scott
>>
>>
>
>and a follow-up question.
>
>When buying a motor, how does one determine the current for
>intermittant duty cycle and 100% duty cycle ?
>
>I would want to use something near the motor rating of continuous,
>but the cheap surplus motors from treadmills have some odd ratings.
>
>

You really have to get these numbers from the manufacturer. If you can't,
you need to test one to destruction to really KNOW what the limits are.
Not a great choice if it is an expensive motor!

You can make some assumptions based on general motor size and
typical specs from other makers for similar motors, such as heat
dissipation from the armature. but, the demagnetization current
rating of the magnets can be pretty difficult to guess at.

And, when using motors for a purpose very different from the original
design use, you have a big problem. The treadmill motors, for instance,
were not designed for reversals, low-speed operation, high accelerations,
etc.

Jon