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| Lowest electrical noise type of motor for low speed applications |
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| Someone:
--- Quote from: ricko_uk on May 24, 2020, 01:19:34 am ---Thank you Mike, it sounds interesting. I did a search but couldn't find any devices. Can you suggest part numbers or keywords? Many thanks :) --- End quote --- Stepper motors are a "special" case of more general brushless DC motors. You can drive them with purely analog signals so the only electrical noise is at the drive frequency (Hz to hundreds of Hz typically). You're way too vague on what is actually needed to suggest anything. Motion systems have too many dimensions/parameters to say any specific example is "low noise". |
| wizard69:
--- Quote from: ricko_uk on May 24, 2020, 01:19:34 am ---Thank you Mike, it sounds interesting. I did a search but couldn't find any devices. Can you suggest part numbers or keywords? Many thanks :) --- End quote --- Does it have to be an electric motor? There are a variety of air driven motors, hydraulic motors and in a pinch you can find Steam and water driven motors. It really comes down to what you are doing, for example an air driven motor may provide rotation buy not real holding ability. If you need to position and hold like a stepper then you couldn't go that route. examples: https://www.atlascopco.com/en-us/itba/products/air-motors, https://www.mcmaster.com/air-motors Some of those motors listed in the McMaster-Carr catalog show up in many Amish and Mennonite shops and farms. Their concerns are not electrical noise but an air line can offer a lot of isolation between whatever is your concern and the controls. Just out of the box back on the farm thinking there. Beyond that I really don't think modern stepper controller are advisable. You may need to take a step backwards to avoid the current limit switching of modern drivers. For example a driver with resistor current limiting. It really depends upon Where your electrical noise concerns are, is it audible noise, greater than 1MHz or something else. |
| ricko_uk:
Thank you wizard69 and Someone, don't know much about motors apart from the basics. All I need to understand/find-out is what type of motor is best suited (brushless DC, stepper, etc). The only requirements are: - must be electrical - max voltage available on the board: 12V - as low noise as possible in terms of amplitude as well as frequency spectrum (this is as specific as I can get) - drive speed 1 RPM to 200 RPM that I can control through a micro - load/torque next minimal as I only have to rotate a 200 grams plastic disk. It can take few seconds to accelerate, it doesn't matter. That's all that is required. And all I need is to understand what is the type of motor with the lowest electrical noise (again, in terms of amplitude as well as frequency spectrum). Would it be a stepper with some slew rate device (after some Googling still no idea what they are) like NiHaoMike suggested or some other motor types? Thank you |
| Someone:
--- Quote from: ricko_uk on May 24, 2020, 01:44:18 am ---Thank you wizard69 and Someone, don't know much about motors apart from the basics. All I need to understand/find-out is what type of motor is best suited (brushless DC, stepper, etc). The only requirements are: - must be electrical - max voltage available on the board: 12V - as low noise as possible in terms of amplitude as well as frequency spectrum (this is as specific as I can get) - drive speed 1 RPM to 200 RPM that I can control through a micro - load/torque next minimal as I only have to rotate a 200 grams plastic disk. It can take few seconds to accelerate, it doesn't matter. That's all that is required. And all I need is to understand what is the type of motor with the lowest electrical noise (again, in terms of amplitude as well as frequency spectrum). Would it be a stepper with some slew rate device (after some Googling still no idea what they are) like NiHaoMike suggested or some other motor types? Thank you --- End quote --- The bolded part is going to constantly prevent any sensible suggestions or analysis. There are extremely low noise (electrically) methods that would either put large magnetic fields, or concentrate all the "noise" to a very narrow frequency band. You have left too many dimensions unconstrained without anything to weigh/trade against. Hence the suggestions above for clockwork or hydraulic drives. A hydraulic servo keeps all the electrical noise away from the drive location, but may have more noise overall. |
| beanflying:
--- Quote from: ricko_uk on May 24, 2020, 01:44:18 am ---Thank you wizard69 and Someone, don't know much about motors apart from the basics. All I need to understand/find-out is what type of motor is best suited (brushless DC, stepper, etc). The only requirements are: - must be electrical - max voltage available on the board: 12V - as low noise as possible in terms of amplitude as well as frequency spectrum (this is as specific as I can get) - drive speed 1 RPM to 200 RPM that I can control through a micro - load/torque next minimal as I only have to rotate a 200 grams plastic disk. It can take few seconds to accelerate, it doesn't matter. That's all that is required. And all I need is to understand what is the type of motor with the lowest electrical noise (again, in terms of amplitude as well as frequency spectrum). Would it be a stepper with some slew rate device (after some Googling still no idea what they are) like NiHaoMike suggested or some other motor types? Thank you --- End quote --- You will not get that sort of turndown ratio without a two stage (at least) mechanical reduction. EDIT What you might get will be in the order of 20-200 RPM or maybe a bit better in particular if you kick it higher then come back down in speed. Steppers will be electrically noisy to hell along with their drivers so I wouldn't consider them either. For Quality motors the likes of https://www.maxongroup.co.uk/maxon/view/catalog are great but by no means cheap. Give them your application and see what they offer. :) |
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