Questions tagged [motors]
Questions regarding motors. All types of motors, their gearboxes, how to drive an electrical motor etc.
421
questions
2
votes
1answer
83 views
Why are there grooves on this bearing?
I tore apart a Corsair PC Case Fan, and after stripping away plastic, I found this bearing inside. It has swirly grooves. What are these swirly grooves for? My guess is it has something to do with ...
0
votes
0answers
37 views
Motor driver only works on one side
I have three motor drivers and all three other them only seem to only work on one of the two sides. I have used a voltmeter to check the voltages across the each of the two sections on each motor ...
0
votes
1answer
34 views
Motor For powered adult swing
I'm trying to design a powered swing for adults (similar to a baby swing, but scaled up). Am I right in assuming that this is functionally a pendulum and the power required is (0.5)mgsin(t)? How ...
3
votes
4answers
105 views
How can you make a solid box jump up with no external forces?
Let's say I have a box lying on a flat surface.
Inside the box, I make a heavy mass hang from a spring attached to the top of the box.
If we pull the mass all the way down and let it go, I believe it ...
0
votes
1answer
36 views
Motor Power for vertical lift in linear slide mechanism
I want to pull up and down 10 kg metal cylinder at 7 inch vertically by using linear slide mechanism in 1 second. What should be the motor rpm, gear type, torque, watt etc? Otherwise how to calculate ...
0
votes
3answers
71 views
Is electric motor torque determined by Kv or by power (watts)
I'm trying to size a motor for an e-bike, but I'm confused as to what motor parameters determine the maximum torque that it can output (Kv or power in watts); I've found the following formulas:
Power (...
2
votes
4answers
53 views
How to size a motor for a balanced lever?
I'm new to mechanical engineering.
I have a 5m long lever with a fulcrum positioned 1m from one end. The whole setup is balanced and I need to calculate the torque of a motor that would move the lever ...
0
votes
1answer
29 views
How does Kia charge the high-voltage battery in EV mode?
I recently bought a Kia Ceed 2020 PHEV (Plug-in Hybrid Electric Vehicle). Its specs mention a 6-gear Dual-Clutch Transmission (DCT), a 105 kW Internal Combustion Engine (ICE) and a 44 kW Motor-...
-1
votes
1answer
53 views
Does a 6 channel motor driver exist?
I have just ordered a giant robot chassis on the internet that consists of 6 motors:
https://shop.pimoroni.com/products/dagu-wild-thumper-6wd-all-terrain-chassis
The only issue is that I am unable to ...
2
votes
1answer
45 views
Kollmorgen TBM frameless motor material
I am an undergraduate student in electromagnetics. I am analyzing and researching Kollmorgen TBMS series motors. What I am curious about is why its motors are wrapped with a "shell" around ...
1
vote
1answer
77 views
DC motor as generator - some questions
I have been doing some experiments using a small brushed permanent magnet DC motor as a generator. I have it coupled to a similar (as in, exactly the same) motor which is powered by a PSU. thus ...
1
vote
2answers
91 views
Help finding motor to replace awning motor (want to jerry rig something together)
The motor on my awning just bit the dust (again). This is the second time this has happened.
I'm looking to replace it with something that I can build myself, using the existing motor enclosure. You ...
4
votes
4answers
84 views
How can I map a global spherical position of a central normal vector to the rotation of 2 perpendicular motors?
I have a machine that rotates two concentric frames. The outer frame has a motor that rotates it relative to the global y-axis, and the inner frame has a motor that rotates it about the outer frame's ...
0
votes
1answer
65 views
How to evaluate motor rating?
I am trying to determine what type of motor to buy that can spin my load at high speeds without overloading it, but really, evaluating this is not my forte. I know this is not sufficient information ...
2
votes
4answers
764 views
How do I start looking for a cheap encoder?
For my project, I need a rotary encoder. The first requirement for it is to be cheap, and I am not sure how to even start looking for them. The RLS magnetic encoders seem cool, but they are a bit more ...
0
votes
1answer
45 views
How this synchronous motor works and how to modify them?
I have the following synchronous motor ripped out from an old range hood in my kitchen.
I used new electrician tape to cover up the coils that should form the electromagnet--the old cover is too oily....
2
votes
2answers
85 views
Selecting motors to lift 3 kg
I need a little guidance to select a motor for a lifting mechanism for a weight of 3 kg. I am going to use two motors and both motors will have a gear (attached to the shaft) very close to each other ...
2
votes
1answer
45 views
Calculation for Motor Selection
I need help with the selection of a motor and a motor driver
I need to spin a 700g (65mm radius) round ball at 35,000 RPM. I need to bring it up to speed slowly, so I also need a motor driver/speed ...
2
votes
3answers
83 views
Inverting motor polarities automatically to close and open a door
Hi,
I need to build a device that opens a chicken coop door.
The idea is quite simple, a motor connected to an axle that pulls a string up just like a wench. It would be activated by a relay timer ...
1
vote
0answers
29 views
Equations of motion in matrix form and energy consumption
I am working on Lagrangian derived high-dimensional motion equations for a robot in matrix form. The structure of such an equation is known:
$M(q)\ddot{q}+C(q,\dot{q})\dot{q}+G(q)=0$
In here, $M(q)$, $...
1
vote
1answer
46 views
Can peltier modules be more efficiant with a medium other than air?
Peltier modules are said to be less efficient than conventional air conditioners. Can a medium like moving cold water over the heat sink increase the efficiency of a peltier module? By how much? ...
1
vote
0answers
27 views
How to design an outrunner BLDC motor
I've difficulties to find a good documentation or a book to how to design an outrunner BLDC motor. My propose is, defined RPM and approximative kW and some other parameters, which are calculation ...
2
votes
1answer
42 views
Raise/Lower 350lb Sawmill Head 12v Motor Specs
I am new to this site and have a problem to solve in an area that I’m pretty lost in. I can usually figure stuff out with the help of the internet and some digging but not getting real traction so ...
1
vote
2answers
42 views
Will a motor with 1,16 Nm rotate a 50 mm gear moving about 12 kg
I'm not an expert in mechanics, so this is my question.
I will buy the motor of the image below to move my door.
In the motor shaft, there is a gear with 50 mm of diameter which will move the door.
...
1
vote
1answer
47 views
how much power is needed to move a linear axis
Ι need help calculating the power usage for a linear axis motor. it must move up and down at a maximum speed of 0.5 m/s a load of 50 kg
What I did so far:
The load (i.e. weight) acting on the motor ...
0
votes
1answer
34 views
calculate torsion in a diffrent sized shaft
first of i know it seems like a homework assignment but it does not, it is calculations i need to do at work and it has been a long time since i studied this material. so I need help to calculate if a ...
1
vote
0answers
52 views
What are some techniques for improving stabilization given a mechanical time constant?
Problem: I have a self-stabilizing system that utilizes an intertial measurement unit (IMU) attached to the hull of a vessel. The system self stabilizes by performing matrix rotations based on the ...
0
votes
1answer
56 views
Connecting a custom 3d-printed part to an SG90 servo
I've very recently got into prototyping as I'm working on a project that I intend on making as simple as possible through conventional methods, just to learn general best practices. I have an SG90 ...
0
votes
0answers
27 views
How to switch between two cores (inside the coil) in a simple brushed DC
I am going to build a very simple brushed DC motor. The rotor will not be enclosed in a stator (the rotor will be built on a bench with free space around it), and I will using permanent magnets to ...
0
votes
2answers
40 views
Mechanically increase motor torque
An electrical engineer here. Using a stepper motor for a robotic arm. A stepper motor at the base of the arm has a max holding torque of 6kgcm. The arm is around 30cm in length from this base motor ...
0
votes
1answer
31 views
Making a three phase squirrel cage induction motor in PLECS?
I was just curious if I was to make a Three phase squirrel cage induction motor connected to a
mechanical load System Block Diagram in PLECS with a rated frequency of 60hz, 6 poles, 220V rated stator ...
0
votes
0answers
28 views
Motor Torque Required in a Reciprocating Compressor
I am working on a Univerity project involving a reciprocating compressor and I am having trouble verifying the motor's torque requirements. I am relatively happy with my calculation method, however, ...
0
votes
0answers
44 views
What is the feedback signal used in the speed control of a brushless DC motor?
In a brush-less DC (BLDC) motor the commonly used speed is sensed using the feedback from Hall effect sensors and the back or counter EMF. The linked article on Wikipedia also mentions that 'Other ...
0
votes
1answer
38 views
What is the difference between a single-stage pump and a centrifugal pump?
Here is the small $12 \; V$ pump that I am looking at. The manufacturer called the product as DC brushless centrifugal circulation small water pump but under its description it mentions that it is a ...
1
vote
2answers
65 views
Is a pneumatic cylinder in general a linear or rotary actuator?
I've just begun to learn pneumatics and I'm really confused where the pneumatic cylinder falls under in the categorization of what kind of mechanical motion it is suppose to produce. I've seen one ...
1
vote
3answers
78 views
What Goes Into Making a Variable Field Magnetic Motor?
(I feel it is necessary to mention that I am not an electrical or mechanical engineer; I just like to build fun things.)
I've already got a good explanation of the concepts involved in a variable ...
0
votes
1answer
46 views
How does the efficiency curve of a well pump shift with speed?
Well pump manufacturers publish "efficiency curves" for well pumps, such as this one (the curve that is most sharply convex down, whose Y axis is read from the "% EFF" scale on the ...
0
votes
1answer
77 views
Is there a difference between a "brushless motor" and a "motor without brushes"?
On the Dyson website they promote their new motor by saying:
Dyson Hyperdymium™ motors work very differently to conventional
brushed motors. We replaced the brush with digital pulse technology,
added ...
3
votes
1answer
55 views
Improving ball feeder design
I designed this ball feeder for my robot however I'm experiencing frequent ball jams as the ball is stuck against the wall of the hole entry or just a ball being moved left and right not entering the.
...
0
votes
2answers
46 views
Can DC motors be used for regenerative braking only? [duplicate]
I am an engineering student working on a machine to tension steel wire rope for maritime uses. The wire rope (max, ~2000m, diameter 44mm) sits (without tension) on a spool (diameter 2m) and has to be ...
0
votes
1answer
44 views
Back EMF from a motor
I have a large DC Motor I ripped out of a treadmill and I'm curious if the back emf generated from manually rotating the motor is a DC output or an AC output. Is it AC only when it's from the power ...
1
vote
1answer
19 views
What size of fan requires motors with a transmission? [closed]
I am wondering at what fan size/speed a direct drive motor is no longer sufficient to drive a fan? Phrased alternatively, what size/speed of fan requires motors with a transmission? For an axial fan.
1
vote
1answer
69 views
Running Hydraulic Pump with High Torque Motor
It's my understanding that hydraulics are merely a means of gear reduction to move a given object. So then I'm wondering why I can't find a formula or way to determine the following issue:
I want to ...
0
votes
1answer
60 views
How do I interpret this DC motor datasheet?
Problem summary:
I need to produce about 0.289 Nm with a rack and pinion system and compress 24 mm of a 110 mm x 21.6 mm, 0.99 N/mm steel spring.
I thought about using with a 10mm pitch diameter gear ...
6
votes
5answers
991 views
Ways to brake an axle
I am currently studying Mechanical Engineering and am doing an assignment where I have to design a wire rope tensioner where a wire rope is unspooled from a drum, but the wire has to be at a specific ...
2
votes
0answers
107 views
Advice on spring launcher project
I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
0
votes
0answers
27 views
Mecanum wheels begin to make robot spin around rather than move to the side
I am using mecanum wheels to steer my robot which I am programming using an arduino. The main problem that I am having is that whenever I attempt to make the robot move sideways like this:
Instead ...
0
votes
1answer
47 views
What would the tension in the cable be?
A subsequent question stemming from here A massless motor is attached to a massless pulley(the blue circle) with a fixed rotational inertia and they are all attached to a mass X (the green platform). ...
0
votes
1answer
40 views
How to calculate the Torque required to rotate two bars perpendicular to each other
This question relates to a previous question (How to calculate the required torque in a static equilibrium system) where I have enquired about the start-up torque required to rotate a system. However, ...
0
votes
0answers
15 views
how does one obtain motion in the theta and phi direction with motors?
I'm not a mechanical engineer,but I'm guessing this is something that is well known by MEs. Say I have a rod and I want to move my pitch one direction, and my azimuth the other direction. How can I do ...
