# Current Dc Gear Motor

Discussion in 'Power Electronics' started by Gabriel Pianez, Oct 10, 2016.

1. ### Gabriel Pianez Thread Starter New Member

Oct 2, 2016
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0
Hello, how is the relationship between Voltage and Current at an DC gear ?
For example, if i have a 5V gear, with 1A, how may be my current if i put 10V ? The current will increase or decrease ?

Thanks

Ps: Dont'care about torque and load, i know that current changes if, we put a Load but i only know to want if my current will increase or decrease.

2. ### Alec_t AAC Fanatic!

Sep 17, 2013
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For a given load and given speed, the greater the applied voltage the greater will be the current.

3. ### MaxHeadRoom Expert

Jul 18, 2013
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Why the 10v? are you trying to achieve double the RPM?
Max.

4. ### Gabriel Pianez Thread Starter New Member

Oct 2, 2016
10
0
It's Only for example.

Oct 2, 2016
10
0
Thanks!!

6. ### MaxHeadRoom Expert

Jul 18, 2013
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I recently did an empirical test on a 90vdc motor by raising the voltage from 0-90vdc while monitoring the current, there was zero load on the motor.
The current stayed a fairly constant 2 amps throughout, any increase over and above the maximum rated voltage will depend on the degree of self generated, BEMF voltage of the motor.
If it starts to drop, then the current will increase.
Max.

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7. ### Gabriel Pianez Thread Starter New Member

Oct 2, 2016
10
0
Thanks for answer, then the current keep the same value, even that you reduce the voltage from 90 to 0, probably the effect will be the same ?

8. ### ronv AAC Fanatic!

Nov 12, 2008
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Here is a link with a pretty good explanation.
In your example above there would be a little increase in current when friction made the motor stop.
http://www.studyelectrical.com/2015/02/back-emf-and-significance-in-dc-motor.html

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