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Results tagged with dc
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user 7701
DC stands for Direct Current, which means the flow of electric charge in a single direction. Examples of a DC source are batteries, solar panels, and dynamos.
1
vote
What happens if i rotated a DC motor's rotor?
This constant tells you the DC voltage created at the lead wires of the motor for a given speed. … You will not get a true DC voltage from the motor. A DC armature is made up of a number of different coils connected to the commutator. …
- 3,090
10
votes
How do I find the voltage range for an unknown DC motor?
A simple model for a DC motor is \$V= R*i + e\$, where \$V\$ is the terminal voltage, \$R\$ is the motor resistance, and \$e\$ is the back-emf voltage. … Resistance can vary on a DC motor due to brush contact. The best way to measure resistance is to take several measurements and average. …
- 3,090
6
votes
Why are rectifiers-inverters used to drive AC motors instead of using the rectified current ...
Second, if you are doing any sort of speed or torque control you aren't going to just have DC for a DC motor. You are going to have PWM DC. … So if that is important to you, you might choose an AC over a DC motor. …
- 3,090
0
votes
DC Brushless Motor For Electric Rover
I would google "fractional horsepower brushless DC motor" and you'll get multiple manufacturers. …
- 3,090
1
vote
Part numbers on Johnson motors don't match their catalogures
The bottom is probably a serial number. If these came out of cordless drills, then the top number could be a marking from the drill manufacturer, rather than the motor manufacturer. Often times when …
- 3,090
2
votes
How do two DC motors of the same power but for different voltages differ in size?
If you have a motor at voltage V1 and you want to have the same performance at a new voltage V2, then you have to multiply the number of turns by V2/V1 and you have to multiply your magnet wire CMA by …
- 3,090
1
vote
DC Motor Efficiency at Fixed Torque
The input power to a motor (any motor, not just DC) is always the voltage at the lead wires times the current into the motor (not I2R). … As others mentioned, a DC motor can be modeled electrically as V = IR + Vemf, where Vemf is the back-emf, which is proportional to the speed of the motor. …
- 3,090
4
votes
Accepted
What are the factors that significantly affect the life span of a DC motor?
Voltage and current - Basically because you will run your motor continuously, you will want to run your motor at or below its nameplate rating. Too high of a current means your motor will heat up too …
- 3,090
1
vote
Battery powering an unknown DC motor
On a DC motor, from the perspective of the equivalent circuit, the current draw is going to be a function of the internal resistance and also the back-emf. …
- 3,090