Re: [CAD_CAM_EDM_DRO] Re: Stepper motor voltage VS amps.

On Mon, 19 May 2003 16:52:00 -0000, you wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Miroslav Pejic <peja@n...>
>wrote:
>> Hello Scott,
>> There is a light:
>> The driver regulates motor current in pulse manner. Every moment
>when
>> current reaches 3 A, (actually, some more then 3 A) driver shut the
>> current off. Then, after little pause current get to zero. In this
>> moment driver supply the current again, and the process repeats,
>with
>> frequency of 15 KHz or more. So, the average current is never bigger
>> then 3 A, and this happens on 40-50 Volts.
>> Real power consumption is 3A * 40 V = 120 Watts.
>> (Apologize for my English, I never learned it in school)
>> Peja
>
>
>Am I correct in saying that you are describing something like a pulse
>width output ?

exactly.

>
>and that even though it may be connected to 40 volts, the actual
>voltage reaching the motor will be 2 volts ?

no.. actual current averaged over time is the rated motor current.

You boost the voltage so that the rise time of the current through the
motor winding is as fast as you can make it.. More torque that way on
shorter pulses...

Harvey

>
>Dave
>
>
>
>
>
>>
>> -----Original Message-----
>> From: sriddle68 [mailto:sariddle@l...]
>> Sent: Monday, May 19, 2003 12:28 PM
>> To: CAD_CAM_EDM_DRO@yahoogroups.com
>> Subject: [CAD_CAM_EDM_DRO] Stepper motor voltage VS amps.
>>
>>
>> I am looking and making a small 3 axis CNC mill for wood routing
>and
>> such. I have been surfing through Ebay and it's endless supply of
>> varied stepper motors. The question I have is this. I see several
>> postings that say for the power source to use 20-25 times the
>motors
>> rated voltage. So if the motor says 2V you should use 40-50V. I
>> understand this is done for responce and such but what about the
>> amperage? If it says 2V 3A should you supply 40-50 Volts and 3
>amps?
>> Or do you supply it the same wattage as the motor plate adds up to?
>> 2V x 3A = 6Watts. This seems to low.
>>
>> If any one can shed some light on this subject for me I would
>greatly
>> appreciate it.
>>
>> Thanks
>> Scott
>>
>>
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>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
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>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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