Rpm Definition and 26 Discussions

Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is the number of turns in one minute. It is a unit of rotational speed or the frequency of rotation around a fixed axis.

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  1. EFB

    Calculate new RPM after change in g-force in a centrifuge

    Supposed answer = 0.482n
  2. P

    Automotive Vehicle Parking Brake Test on a Slope [How Convert to a Flat Ground test?]

    Vehicle Mass : 3 tonnes Manufacturer's instruction is to test vehicle's parking brake effectiveness is to engage parking brake on 30.96 degrees slope. If it holds, it is effective. I do not have 30.96 degrees slope & I want to replicate the same test on flat ground. I was thinking of...
  3. E

    Slowly Rotating Device For a Camera Pan Timelapse

    Hello all! I just discovered PF as I have been searching about a project I have been pondering for a day. The idea is to have a device that I can set my 3lb camera and have the device rotate left-to-right && || right-to-left over the duration of 2 hours for use in a sunset/cloud timelapse...
  4. raclemai

    I need to maximize my RPMs in a single cylinder flywheel

    I am working on a flywheel single-cylinder engine powered by a 40 psi air compressor. My task is to achieve as many RPMs as I can. I have already bored two exhaust ports in the frame as shown in the pictures attached. I've done some 600grit sanding on points of contact, am using lubricant prior...
  5. S

    Calculate the additive RPM required for tension control

    In a web tension control system, where feed forward is to be used. A tension set point is desired let's say 20lbs, and a load cell system provides feed back. There will be dead weight on the load cell as the material with no pull sits on top of the load cell system. [Obviously I will need to...
  6. saaaaam

    Calculate RPM given the force of a torsion spring

    Homework Statement I've got a flywheel of Inertia = 0.0019302kg/m^2 (found via solidworks), when a torsion spring is released, a force of 10N acts on the wheel via astring attached 0.065m above and 0.0325m to the right of the wheel's axis at an angle of 40 degrees. Homework Equations What is...
  7. A

    Plotting a Power Graph using Torque & RPM

    Hi guys, Sorry if this has been covered before but I have been searching the forum looking for the exact information and have been unable to find it. I am currently carrying out a project to make a Honda GX35 engine suitable for competing in the Shell Eco-Marathon where I will perform...
  8. A

    Small question regarding a motor-compressor gearbox

    Greetings all I have one question here. There is a centrifugal compressor that is driven by an the electric motor. the speed of the compressor is higher than the speed of the electric motor by using a gearbox with speed increaser. suppose that the motor speed is 3600 rpm and the compressor...
  9. Tinokoloski

    B How to calculate rpm of an aeolipile

    Hi! I am making an aeolipile as a school project, and I was wondering if you could calculate the rpm. This is the basic principle of an aeolipile. You should be able to calculate the rotating velocity right? Knowing the mass and ignoring any resistance. But then you'll need the rotating...
  10. C

    Increasing the Power Output of a Turbine

    I have a hydro turbine spinning at 62.746RPM and it produces 170.195Nm of torque. It generates 1.1183kW but ideally, I would like to step it up to at least 4.5kW. Is this possible using a gearbox and if so how can it be done?
  11. T

    Number of turns vs. wire length affecting voltage in coil

    When winding a coil around a magnetic core, if you wanted to tap the coil such that each half has the same AC voltage output, would you: A) wind each part at the same RPM for the same amount of time, to get the same number of turns for each, or B) wind the second part proportionally less, to...
  12. B

    Do I need a feedback card to acquire motor RPM from a VFD?

    The VFD I plan on using; DURApulse GS3 series AC drive: https://www.automationdirect.com/static/specs/gs3drives.pdf Model: GS3-22P0 The feedback card accessory for the VFD: https://www.automationdirect.com/static/specs/gs3fb.pdf Hi everyone, I would like to know if I need this feedback card to...
  13. O

    Induction Motor Ratings

    Hi... Need help understanding 1MW, 6kV, 1600 RPM,Cage Rotor Asynchronous Motor, 3 Phase, 4 Poles. I have the basic understanding of all ratings but have received very low price for this motor but when i searched on the internet it looked huge and had very high price as compared to what i have...
  14. C

    Using a DC Motor as a Generator

    So I'm working on a senior design project and was trying to use a DC motor to charge a battery. The point is to allow for quick use to charge a phone or a laptop in circumstances where you need a quick charge. We have lead-acid batteries connected in series and parallel to give us: 14,000mAh...
  15. Z

    Automotive Vehicle and Engine Simulink Model Engine rpm calculation

    Hello Everyone, I am designing Simulink model for HIL testing. Basic concept: Input: Throttle angle ----> Injection timing from that I have calculated requested torque (% of max torque)(chekced and correct) Real torque follows requested torque with delay. (long list of conditions depending on...
  16. J

    Low RPM, high power calculations help

    Hi guys, Im trying to build an electric wheelchair with mecanum wheels, and as you might know, each of its 4 wheels has to be independently powered for the chair to have holonomic motion. With my desired speed to be around (brisk) walking speed only, say 1.15 m/s, and my mecanum wheels sized...
  17. J

    Gear RPM "img attached"

    Hey Guys, So in the attached image I'm trying to determine what the rpm of the 60 tooth gear will be given the 8.4" tire will be rotating at .68 rpm, everything else is just an assumption on my part. I'm assuming the following which is probably wong: The tire being rotated at .68 rpm will...
  18. S

    Motor torque and size

    Hi I'm looking for some info and advice. I've looked across the Internet and forums looking at different formulas for working out the torque requirements for a motor but can't find anything that helps me. I have designed a small amusement ride. Please see pic below. The outer ring...
  19. I

    Determining the number of gear teeth?

    I have a system that consists of a shaft and two selected gears. I want the shaft to be rotating at 250 RPM and to deliver an input power to the system of 850W. The input torque at the shaft is 71Nm. How can i use this information to determine how large my driving and driven gears will be...
  20. D

    How do I know how much this motor is putting out?

    Hi Just wondering if someone could help me! I need to know how much torque and RPM a motor will output for a given load (0.75kg), the only information I've been given is how the RPM and current vary with time for 4 different flywheels of masses 118g 166g 208g and 337g! the dyno test datasheet...
  21. R

    Use More Motor Power

    Howdy! I have a 10 hp motor on a machine but it's only using 3 hp while it's running. The output shaft of the motor is connected to a bigger pulley to spin a wheel. Is there any way to increase the torque at the wheel while maintaining rpms? My first thought was to use more of the motor power...
  22. E

    Automotive How does the throttle affect the RPM of an engine?

    Hello, I'm working on a car simulation and I'm attempting to implement a manual transmission simulation into the game. My question is, how do you find the rate of change of the engine's RPM when the gas pedal is pressed in the car?
  23. Z

    What gears to use to reduce fan speed from fast moving motor

    hey, I am building a fan, but I need the fan blade to move relatively slow, slow enough to see each panel on the blade. I am expecting to use a gear system with a belt. What gears should I use to active this?
  24. N

    On what does the cfm of fan depend?

    On what does the cfm of fan depend ? how to gain maximum cfm from a 1800 rpm fan ?
  25. V

    Relation between torque and rpm

    I was reading something and they said i was to decrease the rpm of a dc motor to increase the torque.. What i don't get is the equation for torque is T=(2*p*N)/60 So increasing the rpm should only increase the torque right.. Im a little lost here..please help
  26. C

    Torque needed to mantain a disk rotating

    Hello, first post! I'd apreciate some help on finding out the calculus for knowing the motor's torque needed for mantaining 2 vertical disks ø46cm, 30kg each at 300rpm, taking into acount 3 generic bearings friction that hypotetically is 0.5Nm friction torque I'm having some trouble trying to...