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Questions tagged [motors]

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9 views

How can I model a hysteresis curve from data?

I have the task of modeling the current to torque mapping for a given motor. I have an experimental set up where I can retrieve current, torque pairs. Now my initial approach was to model the ...
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0answers
43 views

Delta Robot: Torque and Motor Sizing

Question: Is 56 Nm enough torque for a delta robot with the below dimensions and specs? If not, what would be the minimum torque needed? Thank you in advance for your help. I am working on a rotary ...
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0answers
47 views

The optical encoder resolution

The optical encoder has a code wheel with a single track of slots and two photodetectors. The photodetectors are positioned so that they produce signals with a 90 degree phase difference. I want to ...
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1answer
47 views

How to rotate the blade?

I have developed a design for a river cleaning machine which can cut and collect weeds. The problem which is facing is how to rotate the circular blade which is attached in front of the machine. I ...
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5answers
3k views

Does a motor suffer damage when resistance to the intended motion is met?

I'd like to create something similar to a hydraulic press. I know I need some sort of motor, but I was curious about a fundamental question about motors when used in a system where the force required ...
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0answers
41 views

how to calculate required torque and rpm to through a 160 gram cricket ball horizontally at 160km/h velocity?

I am going to design a bowling machine. In this design, I'm going to use two motors that are being placed vertically and their shaft are attached with two horizontal identical wheels with a space of ...
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0answers
14 views

DC Inverter motor AC utilization category

I am looking at specs of an air conditioner unit. It uses DC inverter technology and maximum current listed as 21.5A So are DC inverter motors considered resistive or inductive? What utilization ...
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0answers
24 views

what does 775 mean in a 775 dc motor? [closed]

I don't understand sometimes what numbers actually mean in some naming conventions of many types of motors. Is there a good repository of knowledge regarding this subject except for those boring books?...
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0answers
15 views

Programmable motion on a metallic planar surface

This question is based on just a vague imagination. I am wondering if there is some way to programatically, make an object move on a planar surface in arbitrary paths (curved , swiggly lines etc) (not ...
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0answers
20 views

What is the top limit for torque per diameter ratio for electrical rotation mechanism working in a tube?

Use case: industrial stop valve placed in an another pipe welded perpendicularly making a T-shape. To make the question more specific let's consider 50mm inner diameter pipe for the linear actuator ...
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1answer
30 views

Why do pitching machines use wheels and not solenoids, actuators, servos or peumatic cylenders?

I guess that generating movement is harder then keeping a wheel rolling, but in terms of power consumption is it possible to compare the power consumption of a motor for driving wheels to that of a ...
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29 views

How to obtain transfer function of servo?

I am using a servo motor and controlling it via arduino. Servo motor is part of a control system and I have to use System Identification techniques in order to obtain the servo's transfer function. ...
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1answer
33 views

How can I calculate the power and torque required for the motor on a wheeled robot/vehicle?

How can I calculate the power and torque required for the motor on a wheeled robot or vehicle if a particular acceleration or movement up an incline is required?
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1answer
58 views

Working out Motor torque

I need to calculate the required motor for a mobility scooter with the following user requirements. The mass of the scooter with passenger = 120kg Max Speed of scooter = 9Km/h ...
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1answer
27 views

Trying to reduce RPM of a combustion motor

I'm trying to reduce the rpm of a combustion motor. It operates at 2000 rpm with 3HP, and I need it to work at around 12 rpm (no matter the power). I've made the math with sprocket and chains, but the ...
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3answers
64 views

Why is the Bush of a motor not replaced with a ball bearing?

Ball bearing reduces friction to a large extent than sliding friction. Motors use a metal ring called bush which slides against the shaft when the shaft is rotating. If a force is exerted on the shaft ...
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1answer
16 views

Isn't this explanation of speed regulation in a DC shunt motor wrong?

This site:(https://www.motioncontroltips.com/faq-what-are-dc-shunt-motors-and-where-are-they-used/ ) explains the speed regulation of DC shunt motor as follows: If the load on the motor is increased, ...
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0answers
16 views

Rotating vertical pole setup

software person here, venturing for the first time in the design of a mechanical system for a hobby project. Please note I have some experience in disassembling, fixing, reassembling mechanical ...
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1answer
29 views

Contrradicting answers for relation of speed of a motor with current

For a DC motor, speed of the armature is inversly proportional to current. But at the same time, we know that torque of the armature is directly proportional to the armature current. Since speed can ...
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1answer
52 views

Calculating needed motor to spin a disk at low RPM

I'm designing a machine that I need to spin a horizontal disk at low RPM using a motor and gearbox. I'm not good at physics so I need help to find a motor/gearbox to fulfill my needs. It's a ...
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2answers
45 views

oscillation motion from DC motor (computer fan)

I intend to make an oscillating motion from a simple computer DC fan (say 5V). My question is: could a signal generator with a sinusoidal signal of (say voltage 5V and frequency of 5 Hz) be used to ...
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2answers
62 views

Why cannot series DC motors self regulate its speed?

When load increases on shunt DC motor, the speed decreases resulting in a downfall in back-EMF. This in turn, causes the net voltage, and hence the current to increase causing an increase in torque ...
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3answers
38 views

Does it matter the type of motor used ? Couldn't the wiring be changed to achieve high starting torque?

A series DC motor has a high starting torque thanks to its field wiring consisting of thicker wires and fewer turns resulting in high starting torque. And a shunt DC motor do not have a high starting ...
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2answers
40 views

Wouldn't placing an inductor instead of a capacitor have the same effect in fans?

A capacitor is kept in the circuit of a fan to overcome the trouble of having torques in both directions. I would like to know if the capacitor could be replaced with an inductor without resulting in ...
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1answer
28 views

Why doesn't the flow of current through the conductors in the rotor of a fan affect it?

The rotor of fan is shown as a series of circles arranged in a circular manner. From youtube videos, I came to know that this is sort of a top view and the circles actually represent conductors ...
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1answer
37 views

What is causing a pulsating, low-frequency vibration in an induction motor?

I have this old squirrel cage induction motor (nameplate below) that I just replaced the bearings on. When it runs, there is a rattling noise that gradually gets louder and then softer, repeating ...
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0answers
16 views

How To Obtain The Correct Differential Gears With Motor Shaft Adapters

My knowledge in gears in limited to their types (bevel, spur, etc). I am trying to combine the power/torque of two DC motors using a differential gear. I have a good handle on the idea and design ...
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1answer
23 views

Atmospheric motor concept plausible?

So this is kind of like a stirling engine. Would this work? A box that has a crankshaft, and two connecting rods that is under a vacuum (with no air inside of it.) The connecting rods are facing ...
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1answer
50 views

Get engine rpm using accelerometer

I'm studying the possibility to read an engine RPM by reading the vibrations of it. Basically an engine is "oscillating" on a car chassis on all 3 axes (X, Y, Z) but mostly on the Y one. When ignition ...
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0answers
23 views

DC motor Magnetic axis of armature winding vs EMF

When considering the cross section of a DC motor we have: I notice that the Magnetic axis of the armature winding is aligned with direction of the EMF that will cause the rotation. Is there a ...
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2answers
57 views

I've never seen this type of flexible coupling, can someone tell me what it's called?

Putting together a project, I've found this clutch but I've never seen this type before. It has a sort of flexible plate connecting the two parts, attached to both in two places corresponding to where ...
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1answer
35 views

off-scale torque measured - what is my torque arm?

I have assembled a benchtop torque measurement stand for evaluating electric motor and controller efficiency. The motor is 49kV , 5kW brushless outrunner. Input power reading is taken from motor ...
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0answers
21 views

Generally speaking are inrunner motors better generators than outrunner motors or vice versa?

Using a motor as a generator but looking to test something I understand that outrunners have a higher torque but would that be neccesarily good for generating electricity or not?
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1answer
39 views

How effective are pancake motors as generators and why

Using a motor as a generator but looking to test something Why would or would they not be good generators thanks
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3answers
86 views

Cheap electrical motor that can spin freely in both directions when unpowered

I am looking for a cheap (preferably under 2000 USD) electrical motor that can spin freely in either direction when the motor is unpowered. The motor will be used as an alternative source of power to ...
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0answers
17 views

Hub Mount Motor to Flange Mount

I have spec'd out a pneumatic motor with acceptable torque for a tension application. The motor has a 1.25" hub with set-screw indent for it's mounting method. Since this a prototype system, I don'...
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0answers
35 views

Starting of direct current Motor

what happens if starting arm of starter does not return to "OFF" position after a temporary supply failure?
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2answers
86 views

Motor torque calculation, about the units

This link shows a motor torque, power, and speed relationship, as shown below: With regards to its units, how does kW and RPM become equivalent to N.m?
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21 views

Borewell motor water outlet adjustment

Recently we put 500 feet borewell in our area, it's hot summer season now. Person who drilled the borewell told me that we can get 1.5 inch of water now. During winter season we can expect at least 2 ...
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1answer
29 views

Are stator magnets in brushed DC motors radially magnetised?

In an electric motor like this one, are the stator magnets radially magnetised, as in, each of the two magnets has opposite poles on the inside and outside diameter?
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3answers
76 views

How to connect a motor with a 4mm shaft to a propeller that takes 1/2 inch shaft?

I have a motor with a 4mm shaft. I've purchased a propeller that's designed to fit a 1/2 inch shaft. How can I securely couple the two?
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1answer
27 views

How to Wire a Brushless Motor with 8 stators?

I am currently for the past few years creating a Brushless Motor on and off. The stator I have built has 8 Stators and I cannot seem to find out how to wire this. I see most Brushless Motors with 9 ...
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0answers
36 views

Finding Supply/Nominal voltage for Torque Motor BLDC

I'm a bit confused by torque motors datasheets as it never mentions any nominal voltage. I would like to run a torque motor on a 24 V battery. The required max torque is 150 Nm (=21000 ...
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1answer
51 views

How can I make a motor powered hammer swing more naturally than a Leonardo cam?

Most people are probably familiar with Leonardo hammer cams. But I'd like to make a motor-powered hammer that swings more like this (apologies for the crude diagram): The hammer would fall due to ...
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1answer
49 views

What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead?

What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead (in a car)? (e.g. price, size, the power to weight ratio, etc.) Can you name any ...
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0answers
23 views

PLEASE ANSWER Sterling vs Combustion Engine

This may be difficult to answer but, theoretically, if you had a car with a sterling engine that produces say approximately 300 horsepower how much of any specific heat source would need to be used if ...
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1answer
58 views

Is there a motor design where a rotor gradually moves into a stater?

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor. If so, I'd like some resource(s)...
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1answer
20 views

Which mounting bracket to use with a geared box?

Which 90 degree bracket would you use for this one? Do you have any suggestions for what i should be looking for, I find it very hard to find something. It is 5cm between all the outer holes. Would ...
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1answer
63 views

Pump Characteristic Curve

I am bit confused about the curve: We could observe from the [Pump curve] that Total Head decreases with increase in flow rate, but for [System Curve], it is opposite, i.e, Total Head increases with ...
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0answers
8 views

Looking for a clamping actuator or back-driveable DC motor

I am a university student attempting to build a haptic feedback glove, and while I do have a main design using electroadhesion, it is a bit finicky, thus I am looking for alternatives for design. ...