On Wed, 2 Nov 2011, Andrew wrote:
> Date: Wed, 2 Nov 2011 20:39:06 +0200
> From: Andrew <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: EMC developers <[email protected]>
> Subject: Re: [Emc-developers] Linear scales
>
> 2011/11/1 Andrew <[email protected]>
>
>> Are You saying that You have found linear motors for acceptable price?
>>>
>>
>> Still not acceptable, unfortunately :)
>> But these motors are very small (70N max force and less 200mm stroke), so
>> the price of motor itself is quite reasonable (less 400EUR). At least, as
>> compared to linear encoders.
>>
>>
> 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.
>
> Andrew
>
Peter Wallace
Mesa Electronics
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