On Wed, 2 Nov 2011, Andrew wrote:
> Date: Wed, 2 Nov 2011 21:28:55 +0200
> From: Andrew <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: EMC developers <[email protected]>
> Subject: Re: [Emc-developers] Linear scales
>
> 2011/11/2 Peter C. Wallace <[email protected]>
>
>>> Another important question. The motor's manual says continuous current is
>>> 2.3A, peak current 6.9A, resistance 3.4 Ohm, inductance 1.2 mH.
>>> Can I estimate required supply voltage from these data? Peak speed is
>> near
>>> 1 m/s.
>>
>> No, the missing parameter is the V/(M/S) constant which depends on the
>> magnetics
>>
>> (like the Volts/RPM constant on rotating motors)
>
>
> Sorry, here it is.
> Back emf constant (line to line) 5.9 Vrms/(m/s)
>
> Should I just multiply 5.9 * 1m/s to get the voltage or it's more
> complicated and other parameters involved?
Since that is RMS you need the Square root of 2 in there so 8.3V minimum. but
you also need to get the peak current through the winding resistance at
maximum velocity to you need to add 6.9 Amps x 3.4 Ohms = ~24V so about 32V
overall
>
> Andrew
>
Peter Wallace
Mesa Electronics
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