Motor Definition and 1000 Threads

An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines convert heat into work via various thermodynamic processes. The internal combustion engine is perhaps the most common example of a heat engine, in which heat from the combustion of a fuel causes rapid pressurisation of the gaseous combustion products in the combustion chamber, causing them to expand and drive a piston, which turns a crankshaft. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air, and clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and ultimately motion.

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  1. C

    Is It Bad to Choose Motors with Higher Torque for My Vehicle Design?

    I'm designing a 4-wheeled vehicle that will be driven by 2 servo motors (rear-wheel direct drive). The maximum torque required will be about 20 Nm (including a factor of safety). Since there will be two driving wheels, this amounts to 10 Nm per wheel. Is it bad to choose 2 motors with 15 Nm...
  2. Fisherman199

    Is There a New, More Efficient Electric Motor?

    Electric Motor Start-Up I have done little research into this so far but my "Law of Thermodynamics" alarm is blaring loud-and-clear. Has anyone here heard of this "new motor?" Has anyone tested one in the field?
  3. Cosmin1337

    Single phase universal motor, variable frequency

    Summary:: How to keep the same voltage and change the frequency of a A.C. universal motor. Hello there! I need some help regarding my final project for the university. I have a universal motor, supplied by a single phase, 220V source. I need to make this motor work at the same voltage, but to...
  4. W

    What is the force equation for power from a trolley motor?

    Author solution:
  5. T

    Increasing motor efficiency to reduce energy consumption?

    I was looking into companies or startups that were doing things with motors to improve efficiency. I stumbled upon Turntide Technologies, which has a partnership with Amazon. Turntide is making a software-driven motor that "enables precise and reliable control to effectively use every watt of...
  6. B

    Speed Transmitting Between Motor Gearbox and Sprocket

    Chain length: 1400mm. Pitch of the chain:12,7 mm Diameter: Ø55 For z=12 Diameter: Ø71 For z=16 Diameter: Ø87 For z=20 Hello friends, Can someone who has knowledge of how to calculate the speed transferred to the sprocket wheel can help in such systems with various gear numbers (z = 20, 16)...
  7. V

    Handle Peak Inrush Current of a BLDC Motor to protect the Power Supply

    I have to use a BLDC motor combined with a BLDC motor driver (X-NUCLEO-IHM08M1) The motor has a rated current of 7.3A. So i am planning to use a 36VDC 13.9A power supply (SMPS). The problem is that the PS that i want to use has a "HICCUP mode" for overload protection and not a "constant current...
  8. J

    Electrical AC Brush Motor: 12 Slots, 24 Copper Bars, 48 Ends

    I have an AC brush motor it has 12 slots where copper wires go and 24 copper bars, if you take 12 wires and go in a slot and come out at different slot and as you go around you filled all the slots now you have 24 ends 2 wires out of each slot which you connect to the 24 copper bars. Heres the...
  9. G

    Engineering Induction motor no load magnetisation loss

    The study material says under 'Estimation of magnetising losses' :On no-load, the rotor current is very small and the slip almost zero. Therefore, R′2s is very high and virtually no current flows through the branch of the circuit containing R′2s. Consequently, the no-load current is virtually...
  10. PhysicsTest

    Minimum voltage supplied to motor windings

    I have seen the following specifications in the Hurst motor data sheet. i have confusion on the Minimum DC voltage to the motor windings. It says as 10Vdc, but even if i give less than 10V it should not damage the motor windings. I can understand the upper voltage if i cross it may damage the...
  11. Chriz3223

    Questions about DC motor drive calculations

    Hi Physics! And again, thanks for the membership! I’m about to build a robot just with some old parts I have. The main thing is the motors. I have 2 DC Motors Specs below. (It’s a MFA975D Series with gear ratio 49:1) Operation range(Voltage): 12V No load = 147RPM Nm = 1,8 Stall Torque =...
  12. S

    Repulsion induction motor question

    Hello everyone, I have an old Hobart A200 mixer that I've rebuilt and the problem is the agitator shaft is spinning twice the rated speed when the motor comes up to speed. It has a repulsive induction motor. Speed 1 starts at about the rated 60 rpm but spins at about 120 when at running speed...
  13. O

    Wheelchair motor heating up -- troubleshooting

    hi i have a 646 se from quickie powerwheel chair pride company.i bought it used it always have had a pull on the right side as if the right side motor was weaker so to go strait i had to aim a bit at the left with the joystick.This summer the right motor or close to it started making a...
  14. F

    Battery Powered Electric Motor and Charging Requirements

    I need to build a battery system to drive a 10 HP pump motor. The actual BHP varies as the pressure in the system rises, but for the most part we are operating at a 10.1 brake horsepower. Run time requirements will vary from a few hours to many hours. I settled on 8 hrs as a basis. Motor...
  15. S

    How to Measure Torque Required for motor to spin a rotating shaft?

    I've harvested a motor from a cordless drill and connected it to a belt which turns a rotating shaft. The motor pulley and the pulley on the other side of the belt are roughly the same size, which a fairly small radius (5 mm maybe?). The issue I'm running into, which I don't fully understand...
  16. Mzzed

    Servo Motor Voltages: 12V vs. 14V Explained

    I would like to understand why servo motors often state they are a "12V servo" but then in the datasheet they will refer to tests and torque ratings at 14V? I'm assuming 14V is chosen due to common lipo battery voltages, but then why call it a 12V servo motor?
  17. A

    Torque Balance of Motor and Transmission

    I read this in my college design book, that for a car transmission, if the engine provide T, and the output is RT(ratio x Torque), the difference of (RT-T) must be back on the engine mounting. This example makes sense, I am not questioning that.However, if i have an offset gear drive, like that...
  18. E

    3D Printer Stepper Motor Torque Requirements Using Gear Reduction

    I hope to explore mechanical engineering one day so I can answer these kinds of questions on my own, but until then, I appeal to anyone that knows how to do this to help me. I am building a core xy 3D Printer and I want to use a belt driven Z axis. I will have 3 or 4 stepper motors to drive...
  19. J

    Response of a motor rotor to just 1/60th of a second of current

    Where can I get actual demonstration that a 1/60 sec current can move the magnet. That is. You just apply 1/60 sec current without other power in the middle of it, will the magnet move that fast in 1/60 sec? Or does motor runs because of inertia of the previous rotation?
  20. P

    Calculation of time taken for a motor to rotate an object 360 degrees

    How would I go about calculating the time taken for the motor on page 2 to move the attached beam 360 degrees? Things such as the rpm and voltage are given in the attached data sheet for various different motors and you can reference anyone you like. I'm more interested in understanding what's...
  21. G

    Sizing the start capacitor for an induction motor

    A friend has a single phase, cap start induction motor with the following characteristics: V 240/250 A 2.6 Hp 1/3 Rpm 1435 @ 50Hz As for as I know it’s not fitted to a machine, but given the low hp rating I’d guess it’s for a drill press. So it would need only moderate to low starting torque...
  22. greg_rack

    What is the physical significance of torque being a vector in an electric motor?

    Hi guys, In my head, torque has also been associated with a bare SCALAR physical quantity given by the formula ##torque=rFsin\theta## which caused a rigid body to spin around its axis. Now, studying magnetism, I find out that torque is a VECTOR, which magnitude is indeed given by ##rFsin\theta##...
  23. kolleamm

    Controlling motor speed digitally

    I'm trying to turn my milling machine into a CNC so I bought this motor driver on ebay. https://www.ebay.com/itm/DC-40A-DC-Motor-Speed-Control-Reversible-PWM-Controller-12V-24V-36V-48V-2000W/173177079359?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 The only problem is I can't...
  24. PhysicsTest

    Motor shaft connections and testing

    This is an MCLV-2 development board from microchip, with it got the Hurst motor as shown below The problem is that the shaft is smooth i cannot connect the loads etc. So, I want to clarify the below points a. What type of connectors i should look for and which websites will have the...
  25. PhysicsTest

    Static power bridge motor drive circuit

    I am referring to the application note from TI, the below is the power bridge circuit. The truth table is as below a. I try the first values of A=0, B=0, C=0 the circuit would then become like this according to me It is open above point O, then how the voltage of ##\frac{-V_{DC}} 2## will be...
  26. H

    Calculating Required Torque for 12V DC Motor

    I am designing a reciprocating saw that I plan to use a scotch-yoke mechanism to convert rotational kinetic energy into linear kinetic energy. I want to spec out a motor and the final thing I need to calculate is the required torque. The motor must be 12 Volts and I need to know the required...
  27. PhysicsTest

    Understanding Motor Data Sheets

    I am trying to understand the Hurst motor data sheet, but i am not clear on the table provided, please help me to understand the data provided System Input: Volts is all in the range of 24V, so it is 24V BLDC motor, i understand. Amps: It is the current drawn from the DC source i understand...
  28. G

    Solving Troublesome Noisy Treadmill Motor

    Link to thread: https://www.ukworkshop.co.uk/threads/very-noisy-motor.125693/#post-1398215 The treadmill is powered by UK standard 1ph 240V AC. The motor is a 180V, permanent magnet, DC brushed type and speed control is by PWM. There is an audio file in the thread; to me, the pitch of the sound...
  29. L

    What is the best DC motor for spinning a vortex impeller at 3000 rpm?

    I am looking for a recommendation on the proper DC motor to purchase for a custom project. My project involves vortexing water using an impeller, which resides in a 1.5" OD stainless shaft residing in sealed bearings - not a whole lot of resistance, easily turned by hand. I need to spin this...
  30. Z

    What torque-speed curve should I use for my stepper motor selection?

    Hello everybody, I have a project in which I need to continuously rotate some plates attached to rods across a flow and measure the effect of these plates on the flow in downstream. The rotation must be in specific angular velocities. Let's assume I expect the maximum moment applied on the...
  31. Feodalherren

    Torque to force conversion (from a motor)

    So this is a silly problem that I ran into at work which made me realize that I have all but forgotten Newton's laws of motion after years of working with just hardware and software. I am in the middle of programming a robot for an industrial application and I realized that I have no clue how...
  32. Y

    How to select a stepper motor and gear ratio?

    Hello, I could use some help learning how to properly size stepper motor. Suppose that I want to use a stepper motor to move a load against the force of gravity. It must be able to start, stop, and hold it's position against the static load. I know the maximum torque of the load. In addition, I...
  33. PhysicsTest

    Please confirm the torque curve of a DC motor

    This is the explanation in the section of DC motor Based on the above explanation i have drawn the torque curve. Can you please confirm if it is correct? In the initial position the torque is maximum and when it reaches the diagram 2 the torque is 0 and then it is maximum.
  34. M

    Engineering DC Shunt Motor: calculation of the efficiency

    Hi, My main question is: should we be subtracting the rotational power losses from the motor output power in our efficiency calculation? My approach: Will skip extra work as I have done the above parts of the question correctly. I used power conservation to state that: $$ P_{input} = P_{motor}...
  35. SalahAhmed03

    Modeling an Induction motor in ANSYS Maxwell 2D

    Hii Friends. I was trying to model an Induction motor in ANSYS Maxwell 2D. The final output of Transient torque (negative torque) looks like shown below. The input passed is a sine wave current with 120 deg phase shift. Any Suggestion will be highly appreciated
  36. Jon Zimmer

    Relation between electric motor and battery current, peak etc.

    Good afternoon guys, I was making some researches about building my own EV and its' specifications but I have a few no direct answered questions and some of them I humbly ask the help for you guys, based on the configuration example below. Considering that I hypothetically have an electric DC...
  37. Y

    Engineering Equation for a DC motor driving an arm

    https://d2vlcm61l7u1fs.cloudfront.net/media%2F9b2%2F9b24aa39-e135-4529-9eaf-29a3cd057502%2FphpubWKNH.png
  38. R

    The RPM of Dyson DC04 vacuum motor and more....

    Hello, I have got an integrated motor-fan unit of a Dyson DC04 vacuum. I don't know the motor speed (could not find from the manufacturer) but I guess, it must be well in excess of 10,000 rpm. Here is an image: https://www.espares.co.uk/product/es1562476 Now, I want to fit an axial, blower fan...
  39. johnboyman

    Building a three phase motor -- figuring out how many poles

    Hello. I am building a three phase motor for a science project of mine. I am trying to match my motor with an inverter so i need to count how many poles I have in this motor. The problem is that I have read about this and some people say that this...
  40. Rx7man

    What Could Be Causing My 3 Phase Motor to Lack Power and Torque?

    I have a small 1hp 3 phase that really lacks torque, it was on a big lathe (12hp) and the entire rest of the machine was wired for 240V delta.. but this motor only has 3 wires coming into the connector box, so there are no options for changing the voltage, yet the nameplate says 220V Delta or...
  41. sophiecentaur

    What does this DC motor supply do?

    A few years ago, I bought a Accurite weather station which has a wireless connection (not wifi) to a unit in doors. I was standing near it on a quiet sunny day and I heard a motor running. It turns out that is's a fan that blows over the temperature sensor to make sure it measures the actual air...
  42. G

    Acceleration issue -- A 120W motor starts to lift a load of 20 kg....

    Okay, here is a question I just can't solve. The 120W motor starts to lift a load of 20 kg. During which time, this load will reach a speed of 0.5 m / s, taking into account the potential energy. PS: Ignore losses in the mechanism!
  43. H

    Designing a DC Motor Torsional Spring Circuit with Arduino Uno

    I'm a relatively new entry into the world of electronics so my understanding of what is possible may not be an accurate one. In a nutshell, I would like to have a DC motor act as a torsional spring with some variable virtual spring constant (k). The motor, or "spring", would act against an...
  44. A

    I Need help developing a movement function for motor motion

    Hi, I have a motor that i would like to rotate to a certain angle, in a controlled manner. During the movement, i want to update the final position I want to reach. The new updated function has to start with the same speed the initial function ended with I wan to find a function that does this...
  45. kolleamm

    I need a controller for this 25kW DC Brushless Motor

    Here is a motor I bought : https://www.alibaba.com/product-detail/55kg-thrust-MP120100-brushless-motor-kits_60816322811.html?spm=a2700.12243863.0.0.2ce83e5f3D0fu9 Can anyone recommend a controller I can use for it? There's many online but I'm unsure which to choose. The motor has 3 cables and...
  46. G

    DC Motor "TACHO ERROR": Solutions & Causes

    Sirs, Am facing problem in dc drive that is dc tacho fault . I have checked tacho and found values of armature resistance are same in all segments in commutator. But motor speed not in control. It is automatically varying and suddenly stopped. Is there any bypass method available for tacho...
  47. E

    Why can't a 2 pole ac induction motor run a 6 pole induction generator

    I will use examples of actual products: 1) 3 hp (2.2kW) 3 phase 2 pole AC Induction Motor 3 hp/2.2kW three-phase induction motor features 2 poles, 2840rpm rated speed, and 7.4Nm nominal torque, with a working voltage of 380V 50Hz. Cheap 3-phase asynchronous motor has outstanding performance in...
  48. kolleamm

    Motor Choice for Belt Movement: Stepper vs DC

    I want to move a belt quickly with a geared motor and with a high torque. Given a limited space, what would be better? 1.Stepper with a gear box or 2.DC motor with a gear box? (Both gearboxes would be the same ratio) I believe the answer is a DC motor with a gearbox but I need someone to...
  49. sophiecentaur

    Silent DC Motor for Automatic Watch Winder | Feasibility Study Stage

    At night, the house is totally silent and I want to make a silent winder to keep my automatic watch topped up. At the moment, our clock radio makes a disturbing whine all night and it disturbs us (real princesses) . I'm in the feasibility study stage. A winder needs to rotate about 600 times a...
  50. S

    Problem with PMSM motor model in Simulink

    Good afternoon, I have developed a Vector Control for a PMSM motor in Simulink using Simscape Electrical but my motor is not spinning. I have tried applying various speed values but nothing happens. I am applying a step signal from 0 to 300 but the motor speed still doesn't move. My error...
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