Building a new system?

5 years 4 months ago #29530721 by Brians11GT
I am attempting to set up a system and I am hoping you guys can help me put it together. What I am looking for is a system that I will manually control position, direction, and speed from a rotary hall effect potentiometer. Simply put, I need the motor to move in the same direction as I turn the pot to the position that I turn the pot to, and hopefully in relation to the speed that I turn the pot. The pot that I have is a Vishay with three lead wires. A pos, a neg and a 5v signal wire to go to the controller. I have looked at several possible controllers families that you have, such as the LDC, MDC, and MBL to name a few. I also need to mention that the voltage of my system will be from 12VDC to 15VDC. I haven't chosen a motor yet. I am holding off until I decide which controller I need because some are for brushed and some are for brushless motors. The amp supply from these controllers I am sure is well beyond what I need as is the voltage. I always think like that. I try to keep the needed specs a fraction of what the controller is capable of. It helps to keep things cool. In any case my knowledge is basic at best. At this point I guess I'm asking which of your controllers would you recommend? After that hopefully you can steer me in the right direction of finding a motor and a feedback encoder.
Thanks, Brian

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5 years 4 months ago #29530722 by TechSupport
Replied by TechSupport on topic Building a new system?
The LDC is no longer available and has been upgraded to the MDC1xxx line up for single channel.

If the pot is going to be used as analog motor command, then you would configure it in such manner.

www.youtube.com/embed/juUvr3aBNo0?wmode=...toplay=1&fs=1&start=

Brushless motors will cost you a bit more, but will last longer since it is not using brushes when commutating the motor.

Here's a link to some vendors that sell motors and encoders.

dev.roboteq.com/dev1/index.php/roboteq-p...rd-party-accessories

Once you figure out what you are going to use for motors, then we can figure out the controller to use.

It will be dependent on how many motors you are going to use (1 or 2) and the power output needed (Volts and amps[max and continuous])
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5 years 4 months ago - 5 years 4 months ago #29530733 by Brians11GT
Replied by Brians11GT on topic Building a new system?
Thanks for the links. The You Tube link to the video is strictly for speed control. I don't believe that will apply to my situation. If you remember I need control of Position, Direction, and Speed if possible. In others words I need it to basically move in relation to position, direction, and hopefully speed of where and how I move the manual rotary pot. I have spent two days looking for a motor. So far no luck. I am only using one motor so a single channel controller will work. I do have a linear servo actuator that may work...here's a link to see it.... www.servocity.com/html/560_lbs__thrust_l...to.html#.VXj6cJXbKM9 . It has a potentiometer built in for position feedback. It's fairly difficult to find a DC motor with any kind of torque, apparently. I guess what I'm trying to build is more of a servo system. Please share your opinion about the actuator. Also, I don't have any info about the built in pot. I'm looking for smooth operation and precise positioning. Would it be wise to pull the motor and gears out of the actuator assembly and hook up an encoder to them (note: I've never messed with an encoder before)? I ask because this actuator is very powerful, especially for the price.

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5 years 4 months ago #29530738 by TechSupport
Replied by TechSupport on topic Building a new system?
You wire up the pot on the analog input, and set for feedback instead of motor command.

You would use a closed loop position for your system.

We do not specialize in motors so there isn't much I can say about your actuator other than it should work with our controllers.

www.youtube.com/embed/xptBWoCq6Rc?wmode=...toplay=1&fs=1&start=
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5 years 4 months ago - 5 years 4 months ago #29530806 by Brians11GT
Replied by Brians11GT on topic Building a new system?
ok, I've done a lot of research and here is what i'm looking at now. I've found a planetary gearbox that takes two brushed motors that work together to turn a single shaft. I have also found an encoder that is designed to be attached to the shaft of the gearbox specifically to provide feedback. the encoder appears to have 5 leads. also, I believe the encoder is digital (the specs say "US digital EM1" and "US digital details"). the specs also mention that the encoder is "Non indexed (no zero point)". I mention these specs. because i'm not sure if it will effect the controller. this is probably a very unusual set up. so we have an analog rotary manual pot with three leads sending command info to the controller and we have a five lead encoder sending feedback info. do you have a brushed controller family to set this up? thanx.

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5 years 4 months ago #29530819 by TechSupport
Replied by TechSupport on topic Building a new system?
Our controllers will use the +5V, GND, A, and B channel wires. Any additional wires will be left floating.

If both motors are working syncronously with a pot, then that is fine, you just set up the analog input to drive both motor outputs.

The brushed motor controller you need is based on whatever the power consumption of the motor.

Voltage, Peak current, and continuous current.
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5 years 2 months ago - 5 years 2 months ago #29531092 by Brians11GT
Replied by Brians11GT on topic Building a new system?
the motor I am using is a brushed magnet 12 vdc motor with a continuous current of 57 amps the specs do not show a peak current (which I find odd). As a reminder.... I am looking for a controller that will enable me to control position within a 90 degree range with the "at rest" position in the center. So lets say the input rotary pot and the motors zero degree (at rest) position is the positive Y axis. I need the motor to rotate in relation to how I rotate the input pot. If I rotate the pot to a -45 deg. the motor needs to also rotate -45 deg. So wherever I rotate the pot to between -45 deg. and +45 deg. the motor has to precisely match it. so clearly direction control is needed. As far as speed control goes it would be nice if the motor speed was in relation to the speed of how fast I turn the pot. the speed control is not essential. I know that type of speed control can be complicated, so if it's to expensive I can live without it. Ok, I hope that is enough info for you to recommend a controller. Also if you have a link to a video of how to set up the controller that you recommend please include that too. thanks so much.

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5 years 1 month ago - 5 years 1 month ago #29531141 by Brians11GT
Replied by Brians11GT on topic Building a new system?
hi all,
I haven't received a response to my recent post yet? you guys are always very quick with your responses. is there something up?

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5 years 1 month ago #29531142 by TechSupport
Replied by TechSupport on topic Building a new system?
The fact you need 57A continuous, would put you in the range of either the XDC2230, or the HDC2450.

The analog pots are susceptible to noise to you will need to add on some filters to keep it stable if you want precision.

There are videos on the product pages themselves if you click on the "Resources" tab in the product links themselves after the description area.
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5 years 1 month ago #29531143 by Brians11GT
Replied by Brians11GT on topic Building a new system?
wow thanks! that opens a wide range of options for me! i'm looking at using a dual channel joystick as a command signal for two motors. I see by the video that the range of the joystick can be calculated, but can there be a user defined range set each motor independently? what i'm looking to do is make the full range of the "Y" axis of the joystick cause motor 1 to travel within the 90 deg. in the manner that I mentioned before in my earlier posts. I also would like to have the full range of the joysticks "X" axis move motor 2 with a much larger range that would involve several revolutions from the "0" point of the joystick in both directions? from your earlier posts I believe I would run both motor outputs in a closed loop position state. is that correct? also, I think I already now the answer to this but to make sure, if the controller is set up like his and the joystick is moved diagonally will both motors move to there corresponding positions? finally, can the controller work properly with an analog input (joystick) with a digital feedback signal?

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