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Adding Intelligence to Rotary Encoders

1/19/2015 08:00 AM EST
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RichQ
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Re: Applications and cost
RichQ   1/22/2015 1:14:59 PM
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@colin0 - It would be best to talk to CUI for application examples. Here's a link to their resources page which might provide the insights you're looking for. - http://www.cui.com/resources/product-resources

collin0
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Re: Applications and cost
collin0   1/21/2015 11:10:46 PM
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The cost of such intelligent motor with mcu inside will increase of course.

The key issue is that how presicion such product could reach. Is it better than the usual way we control motors by pwm sigal with right algorithom.

Please list some successful application with the intelligent motor.

DrFPGA
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Re: Some encoder basics
DrFPGA   1/21/2015 10:09:16 AM
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Thanx for the overview. Should be helpful for those just getting into motor control.

CUI Inc
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Re: CUI on our design "blacklist"
CUI Inc   1/20/2015 7:13:12 PM
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MWagner_MA,

CUI Inc would like to formally apologize for your negative customer experience with one of our products. We also apologize for not responding to your issue in a timely manner, but we would like to help resolve the situation. Please e-mail: rhornberger@cui.com who will ensure that your case is put in the right hands and a solution is found.

Once again CUI extends our sincerest apologies and we hope to create a more positive customer experience for you in the future.

Sincerely,

CUI Inc

 

TonyTib
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Some encoder basics
TonyTib   1/20/2015 12:31:46 PM
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Closed loop control always needs some sort of feedback.  Traditionally servo motors have used rotary encoders or resolvers, although now there are sensorless algorithms for speed control using back EMF. I've seen quite a few steppers with encoders, too, since the encoder can detect stalls or missing steps.

Also, if you need to know your position, you need some kind of sensor, such as a rotary encoder, resolver, linear encoder, LVDT, magneto-restrictive sensor, etc.

The CUI AMT encoders are very affordable; some models are <$30 at Digikey.  Most optical encoders are substantially more expensive, and a servo motor can easily cost much, much more.  The encoder itself is made in Japan (at least, the one I own was), while the mounting hardware is made in China.  I haven't heard of any issues from the distributor mentioned before, but I only have 1 AMT encoder (typically, we buy our motors with encoders, so the motor mfg chooses the encoder).

Since the AMT encoder already has to have an ADC and logic, it's probably cheaper to use an MCU.  As mentioned, I think the AMT encoder would be a natural match for a serial interface such as BiSS.

 

RichQ
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Re: Reporting direction of rotation
RichQ   1/20/2015 12:13:15 PM
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DrQuine, the intelligent encoders reports to the motor control system the standard A, B, Z quadrature pulse waveforms that other types of encoders do, and direction is inferred from whether A or B lead. The serial interface and intelligence operate on a separate channel that is not part of the motor control loop, and I have no insight into what kinds of information it provides in its diagnostic mode.

RichQ
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Re: CUI on our design "blacklist"
RichQ   1/20/2015 11:59:09 AM
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Sorry to hear of your bad experiences. Let us know how it gets resolved.

RichQ
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simple interface
RichQ   1/20/2015 11:57:27 AM
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Prabhakar, true the MCU is not necessary in the design. It simply provides additional advantages that can more than justify its inclusion.

RichQ
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Re: Applications and cost
RichQ   1/20/2015 11:55:19 AM
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As I understand it, the idea of these devices is to save time and cost in design, installation, maintenance, and inventory. That's what justifies any purchase price premium, and is application independent.

RichQ
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Re: Encoders are fun
RichQ   1/20/2015 11:49:25 AM
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TonyTib, Thanks for pointing out the MicroE Systems encoders. They are not ones I was familiar with. They do seem to have a small degree of programmability, although not to the extent I discussed. Also good to have a field report on these devices in action. Hard to get from an editor's desk, so appreciate the added insight.

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