i need to vary the speed of a 12vdc 5amp dc motor to match it up to another motor. It does not need to be accurate just eye balling the speed but i need to be able to change the speed or voltage (which is the same thing) can someone reccomend a part number or product that can do this, i dont know anything about electronics, i just need to know what to buy.
2007-03-02 04:45:09 · 6 answers · asked by Robbie D 1 in Science & Mathematics ➔ Engineering
You need to buy a variable resistor switch... I can't think of a exact Part that would match... but go to your local automotive parts supplier and browse through the Grote catalogue.
2007-03-02 04:54:42 · answer #1 · answered by Satchmo 4 · 0⤊ 1⤋
Yep ... variable resistor would be the best bet, since the electronics control would be pretty expensive.
You DO realize that by slowing the DC motor down, you have to reduce armature volts and that torque is maintained?
And that to speed it up (since it probably has permanent magnets) you have to increase the voltage (which may cause insulation difficulties)? Since you can't vary the strength of the permanent magnet, torque remains constant as well.
2007-03-02 06:01:30 · answer #2 · answered by CanTexan 6 · 0⤊ 1⤋
You need a device such as the LM 317, which is a 3 terminal regulator, which shouldn't cost more than a dollar or so, a small potentiometer (variable resistor). and a fixed value resistor as a current limiter so you don't smoke the regulator. Email me, I can get you through this.
2007-03-02 23:57:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Use a potentiometer to drop voltage. Buy one at radio shack. If you want fine adjustment, a 10 turn pot is the best, but it probably cost more. Make sure the wattage rating is sufficient. Your current will go up to maintain the load, so be careful not to burn up anything else in the circuit.
2007-03-02 09:10:28 · answer #4 · answered by Jmeller 2 · 0⤊ 1⤋
A rheostat.Make sure it's rated for 12vdc, 5amps. Try Radio shack. A big name hardware store probably won't have it.
2007-03-02 13:12:28 · answer #5 · answered by Snowman38 1 · 0⤊ 1⤋
The best bet and most reliable is to use, (PWM) Pulse Width Modulation.
The link below shows a kit you can purchase.
Also search google for "Pulse Width Modulation Motor Drivers" for full explanation and theory.
Good Luck!
2007-03-02 15:08:46 · answer #6 · answered by John 2 · 0⤊ 1⤋