DC Motor Calculations—Part 1
Jul 17, · The DC motor no-load current will be 25% of the full load current at the full speed (not at the base speed). hence. No load current for DC motor = x Motor Full load current. Benefits of Finding Motor No-load current: Testing the motor with low rated testing equipment. For example, you would like to run a 50HP motor at the no-load condition at the maintenance area, then you cannot shift . Apr 11, · How to Calculate Motor RPM. To convert the slip rating to RPM: RPM x slip rating = RPM slip. To calculate the full-load RPM: RPM – RPM slip = full-load RPM.
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Suppose I have a robot of a given mass, and I'm choosing between 2 different wheels and 2 different motors to put on it.
For each wheel I have the diameter, and for each motor I know the stall torque and free speed. How would I figure out which motor and wheel combination will make the robot move the fastest?
My calculations show to use the big motor with the big wheels, but the small motor with the small wheels goes faster than the big motor with the small wheels. I am not sure my calculations are correct, I need to know the correct way to work this problem. From here you plug in your values and see which one has the highest top speed and which one has the highest acceleration least time. This look suspiciously like a homework question, so how to calculate no load speed of dc motor allowed to discuss concepts but not just answer your question or your professor won't be too pleased Your question doesn't say what the rolling motoe is e.
If there how to play wanted dead or alive on drums no rolling resistance both motors will simply accelerate until they reach their free speed, and in that case you want the highest free speed with the largest wheels.
If there is rolling resistance then the motor will accelerate until the rolling resitance is the same as the force generated at the wheels i.
Mechanical engineers would do power calculation first. What is prevalent about these motors, torque or power or frequency? I thing the first two can give how to download music to my samsung cell phone which shall accelerate faster, while the last one which robot shall have higher final speed.
Let's suppose that power cannot be calculated using free speed. Then you have four possible robots with four possible accelerations and four possible top speeds. Then results what is periodic motion in physics on the track length! Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How do I calculate DC motor speed for a given load? Ask Question. Asked 8 years, 11 months ago.
Active 8 years, 11 months ago. Viewed 14k times. Improve this question. How to calculate no load speed of dc motor Z Lozd Cyberike 51 1 1 gold badge 1 1 silver badge 4 4 bronze badges. While I am no expert on DC motors your problem should not be too hard to solve.
Could you clarify a bit what you mean what does credit card utilization mean "move the fastest"? Are you asking for maximum acceleration, top speed or fastest travel time for a given distance incl.
Also if you have done calculations already, why not include them here. I am looking seed the top speed after acceleration spees the robot itself. This seems logical, but this is the part Howw was trying to confirm. As long as I am using the formulas correctly, I am fine. However, if I am not using them correctly I need to know it before I present it to my class.
Since the load on the motor goes up with larger wheels, the motor slows down for the larger wheels according to the first formula. My students would have to plug the numbers into each formula to see if the motor slows down more or less than the increased movement you get per rotation from the larger wheels.
The point is, big wheels on a robot are not always better. This totally neglects inertia and torque though and is not a very educative treatment of the problem. Show 5 more comments. Active Oldest Votes. Improve this answer. John Alexiou John Alexiou What color garage door for white house have one more question: How do you convert weight load to torque load how to calculate no load speed of dc motor the motor given that motor force is applied at radius r of the wheel?
By the way, I am working from a speed vs. Maybe you should invite Alexander to provide his insight. Show 3 more comments.
John Rennie John Rennie k 97 97 gold badges silver badges bronze badges. I want to make sure I loaf using the right formulas. By the way, I am not trying to make it too complicated, so moment of inertia answers are notor. Let's say one robot has larger acceleration and smaller top velocity, and the other the opposite. Then results depends on the competition track length!
Luckily, I work at technical universities and bump into civil and mechanical engineers with PhDs every day. If I'd had your problem, I would simply ask the most competent of them.
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The speed at a given power will depend on the load. This is why a tiny motor whips round at no load and slows down at the same power with a fan on the end. The best way to measure the speed of a dc motor is to use some form of encoders. 1 revolution = (2* p) radians. 1 radian = (/ p)°. 1° = (p /) radians. From the angular velocity,, we can find the tangential velocity of a point anywhere on the rotating body through the equation tangential velocity, v = r*, where r is the distance from the axis of rotation. Per unit speed regulation can also be defined as the ratio of the difference between no load to full load with respect to the full load. It is given by the equation shown below: Where, N n l is the no-load speed; N fl is the full load speed; A motor which has nearly, constant speed or the difference between no-load and full load is very less is said to have a good speed regulation.
Choose the motor type, then enter the full load current of the motor. Then press the calculate button to motor get no-load current. Also at no load, the power factor becomes very poor.
Since motor draws high reactive current rather than the active current. Therefore, the normal current calculation formula will not help you.
It means the three-phase motor will be connected in star connection one end short and another end supply. It means the motor will be connected as the delta. Look at the difference between star-connected motor and delta connected motor, do you know why this difference? If you connect the motor at star connection means, the applied voltage will be reduced, hence as the voltage is proportional to the speed of the motor.
While decreasing the speed along with the voltage, the motor current will be decreased and the motor draws the current to remain the same speed. If you connect it in delta connection means, the winding will get full voltage, there is no speed drop.
Note: All the above calculation is my personal experience. Note: All the above calculations are my personal experience. Save my name, email, and website in this browser for the next time I comment. Home Calculator Motor no load current Conversion Calculator. Motor No load Calculator: Choose the motor type, then enter the full load current of the motor.
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