On Wed, 2 Nov 2011, Andrew wrote:
> Date: Wed, 2 Nov 2011 21:12:24 +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]>
>
>> On Wed, 2 Nov 2011, Andrew wrote:
>>> I just wonder if 7i39 can work with linear motors without Hall sensors?
>> The
>>> motor manual says digital or analog Hall sensors are optional.
>>
>> Should be able to do this with the BLDC component, as actual
>> commutation is alway done by the encoder once the initial carriage (I was
>> going to say rotor) alignment is done. One option for alignment is a limit
>> switch as an index (BLDC runs the motor in stepmotor (uStepped) mode until
>> it
>> hits limit switch/index which sets the initial alignment).
>>
>> Another method that the BLDC comp can do is pure magnetic alignment
>> (this requires that the motor basically has near 0 load at startup)
>> Magnetic
>> alignment needs nothing but the encoder.
>>
>> Thanks! There will be limit switches.
>
> 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)
Peter Wallace
Mesa Electronics
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