Hello all, this is my first post here so try to be nice, in turn I will try to be as descriptive as possible.
I am trying to build a miniature type of hoist/wench for a project. By miniature I mean that the motor will have a max torque of about 3Nm and power of about 33W or 1/25hp.
So this is what I need the hoist to do: I need the hoist to be able to lift the determined weight, sounds simple enough right? Well I wish it were that simple. Well what if I said that I needed the hoist to lift a changing weight at a constant velocity? Not a greater weight cause that will be maxing out the motor but from the max weight raising it at the same rate even if the weight decreases.
I hope this makes sense, what would be the best way to do this? I was thinking of a sewing machine pedal which varies the speed of a sewing machine motor, but that changes the speed not the torque, are there variable torque motors? I know power is a product of speed but torque is independent so I don't see how a variation in speed will automatically be a variation in torque. I don't need to have the motor sense the change in weight and thus carry the torque but I do want it be be human controlled via a pedal mentioned above or something like that.
There are other things I need to have the system do as well but I wan't to get a clear understanding of this (motor) part first. I know it will require some wring up and all but I first want to know if its mechanically possible simply by wiring up a pedal type thing to a motor correctly.
Anyways, any help will be greatly appreciated, thanks before hand!
I am trying to build a miniature type of hoist/wench for a project. By miniature I mean that the motor will have a max torque of about 3Nm and power of about 33W or 1/25hp.
So this is what I need the hoist to do: I need the hoist to be able to lift the determined weight, sounds simple enough right? Well I wish it were that simple. Well what if I said that I needed the hoist to lift a changing weight at a constant velocity? Not a greater weight cause that will be maxing out the motor but from the max weight raising it at the same rate even if the weight decreases.
I hope this makes sense, what would be the best way to do this? I was thinking of a sewing machine pedal which varies the speed of a sewing machine motor, but that changes the speed not the torque, are there variable torque motors? I know power is a product of speed but torque is independent so I don't see how a variation in speed will automatically be a variation in torque. I don't need to have the motor sense the change in weight and thus carry the torque but I do want it be be human controlled via a pedal mentioned above or something like that.
There are other things I need to have the system do as well but I wan't to get a clear understanding of this (motor) part first. I know it will require some wring up and all but I first want to know if its mechanically possible simply by wiring up a pedal type thing to a motor correctly.
Anyways, any help will be greatly appreciated, thanks before hand!