Questions tagged [motors]
The motors tag has no usage guidance.
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1answer
34 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
14 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
30 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.
...
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25 views
Is it possible to mechanically switch between rotational directions of an output shaft?
I know that it would not be possible while the input is still rotating, but is it possible to create a gear box or chain assembly that can change the direction of rotation?
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1answer
35 views
how to find the motor specification
I need a motor for my project. My aim is to move a 10 kg mass using a belt pulley system, with a velocity of 15km/hr to a distance of 3.6m. The maximum time for moving the same is 1.5 sec.
Can ...
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0answers
26 views
What kind of electric motors are used to build industrial robot arms?
I'm fascinated by how robot arm nowadays can combine precision with operating speed (e.g. KIRA by Motorized Precision).
I can imagine building a robot arm with stepper motors would be pretty precise ...
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1answer
29 views
Would some manufacturing processes be more efficient if driven differentially by a single motor, up to ~150 kW, than multiple lower-rated motors?
I'm writing a discussion paper on the potential energy efficiency benefits of integrating different manufacturing processes by co-location on the same site. One possible field for integration is in ...
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1answer
34 views
How to adjust power requirements for a propeller working against a pressure head
I'm in the process of building a hovercraft. In order to lift it, I'll need a motor directing the flow of air into a skirt. The specs for the motor I'm looking at say that it can turn a 15x5 dual-...
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1answer
56 views
PID control of a DC motor with PWM from Raspberry Pi - how to cross dead area?
I'm driving a DC motor (actually a linear actuator) with a Polulu motor controller from a Raspberry Pi. The motor drives if you ask for anything between 20 and 100% duty cycle, so there is a dead zone ...
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1answer
52 views
The torque I need to lift the device and correct gear ratio for the device to be as fast as possible
The device have to climb a pipe vertically. I have a DC motor with power rating 21.2 w, output speed 13360 rpm and maximum output torque 154.4 gcm.
My device is 1 kg and I have wheel with 0.012 m ...
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2answers
77 views
Calculating proper specs of DC motor for rig driven on the rope
I'm trying to build a cablecam, a picture that serves only for illustration is:
The DC motor is
48V
5000W
6000rpm
6000 oz-in stall torque
85% effiencity
0.066 Ohms Resistance
135Kv (RPM / Volt)
...
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0answers
39 views
Need help picking motor to wind a spool
The application is a motor attached to a spool to wind/unwind window blinds.
I would like to operate the motor at $v=0.2\text{ m/s}$, with a max load of 1.5 kg.
I need to know the ideal diameter ...
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1answer
43 views
How can you calculate the torque and speed of a single output gear being driven by two different input gears?
I am building a gearbox that needs to lift around 50lbs very rapidly. I already have a single planetary gearbox that does the job in around 7-10 seconds, but I would like to cut this time down ...
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0answers
24 views
What motors to use to guide tape with high speed
My field isn't dealing with motors and such at all, however, I now need to build something that controls two motors.
So I have two guiding reels with tape between them, similar to old tape recorders. ...
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2answers
67 views
Is the speed of a DC motor proportional to PWM?
I'm trying to control the speed of DC motor but unsure of the relationship between speed and PWM. I'm aware that the bigger the duty cycle, the larger the speed, but how exactly would this ...
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0answers
21 views
Example induction motor
I have three phase induction motor:
$U=6\text{ kV}$
$P=630\text{ kW}$
$f_1=50\text{ Hz}$
speed of rotor $n=1410\text{ rpm}$
Maximum moment is reached when $n=1120\text{ rpm}$. Now voltage and ...
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0answers
18 views
giga/tera hertz timer? super fast spinning disc?
How would I go about detecting a very small amount time dilation
I want to accelerate something and measure the time dilation even if I reach 1km/s time dilation is very small but it looks just ...
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0answers
40 views
Problem with transfer function in DC Motor
I'm trying to verify whether the transfer function in this control diagram is the one stated in this document.
I tried solving it and got this:
Shifting the armature current $$I_a$$ feedback point ...
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1answer
44 views
Choosing a proper BLDC motor for lab centrifuge
I'm trying to make a swing rotor centrifuge and find a proper BLDC motor to reach 6000G with capacity of 4x50ml Falcon tubes. I did the calculations roughly but I'm not so sure about them and also ...
0
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1answer
26 views
What kind of bearing should be used for free rotation under load?
Let's say I have a 300 rpm motor and a roller connected to it's shaft and I would like to use it for pulling fabric from a printer-kind machine. But think that printer's printing speed is changing ...
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0answers
14 views
Does the frequency of input voltage in induction motors have to be continuously altered?
I understand that for magnetic lines of the rotating magnetic field to cut the windings of the rotor (and induce current), the field has to rotate at a slightly higher rate than the rotor. But if we ...
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1answer
21 views
time interval selection for RMS of vibration
What is the general practice for selecting time interval for RMS calculation for vibration data (mm/s)
Should it be linked to the the frequency of the motor or the sampling rate?
Thanks!
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0answers
9 views
Individually Addressable Motor Strip
Can you make an individually addressable motor strip if you replace led with motors?
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1answer
33 views
Electric Motor Sizing : Understanding how much torque I need given Force
Physics has never been my strong point... I have a task to size a motor. The question is: Based on information below, how do I calculate required motor torque to accelerate a mass with the ...
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1answer
58 views
Calculating Minimum Gear Ratio To Lift Weight
I have a 337 watt motor, and want to lift ten pounds. What kind of gear ratio will I need for a gearbox I attach to this in order to lift the ten pounds at a constant speed?
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0answers
20 views
Which type of motor can I use for my project?
I am working on a project of linear positioning where a bed is coupled with a motor driven high pitch multi-start back driving lead screw. I need the bed to be freely moving when the motor is not ...
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0answers
12 views
clockwork motor output in joules formula
I'm trying to understand the output of clockwork coils in joules or watts for different coils. You know the pullback car or windup pocket watch mechanism. I have heard it also called power in the ...
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1answer
40 views
Understanding the torque of a motor/gearbox combo
Imagine a typical DC motor / planetary gear combos.
Is my thinking correct:
Say you have a 100 kg mass on a frictionless surface. The gearbox output shaft has a 0.10m arm with which you push the ...
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2answers
60 views
How to fix this gear
This is a gear that transfers force from a motorcycle kickstarter to the transmission. What method should I use to repair the missing teeth.
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0answers
23 views
Coupling two double shafted stepper motors in series [duplicate]
Coupling two identical double shafted stepper motors in series using two identical drivers will that double the torque?
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1answer
2k views
Inverter + Direct drive vs. Belt drive motor in washing machines?
What should I choose from today.
I am looking at washing machines, and I see that LG has this Inverter Direct Drive (6 motion cleaning) technology in their machines, I see that its not like a year ...
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1answer
37 views
Is it possible to replicate a motorcycle engine cylinder head?
Is it possible to create a mold of an aluminium motorcycle cylinder head so that you can create an exact replica with melted aluminium?
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1answer
47 views
Understanding Motor Torque calculations
I have an Aluminium square cross sectional rod of $20mm$ X $20mm$. Length 700mm.
At the end of this rod there is a mass of $660$ $g$ attached.
My question is what torque do i need to lift this mass up ...
2
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2answers
57 views
Why is the Current to Motor less than Motor Rated Current?
I have a motor for a submersible pump with a Rated Current of 8.4A as given in the motor's electrical data. However, when it is running, I record a current of 3.4-3.9A. Is there a fault I am supposed ...
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1answer
46 views
Need to produce vibration amplitude of 200 um (approx) at natural (resonant) frequency, can be any frequency between 100 to 150 Hz
In order to conduct study, I need to produce controlled vibrations with amplitude (maximum) approx 200 um (micro) at frequency between (100-150) Hz. Vibration amplitude must be controlled with input ...
2
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1answer
103 views
Quick return mechanism for spring-loaded screw
Looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position.
Specifically, a screw ...
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0answers
50 views
Measurement of ICE torque
I'm seeking a precise description of engine torque.
We talk about torque in terms of the twisting force that the piston exerts on the crankshaft with a radius equivalent of the rod throw.
Assume ...
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0answers
19 views
Correct terminology for a zero turn stator winding on a BLDC?
I'm designing a BLDC motor with some unique geometry constraints (~250mm long, ~45mm diameter with a ~35mm bore down the center) and am considering using straight copper bars carrying high current ...
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3answers
150 views
Why don't escalators slow down when people get on?
My friend and I were discussing this earlier: why don't escalators slow down when people get on? We are not interested in any fancy schmancy computers that might adjust their speed for capacity/...
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3answers
100 views
How to attach a cylindrical load to a motor safetly
The project is to rotate a load using a motor with a varying speed between like 2000-10000 rpm.
I'm using a flange coupling to attach the cylindrical tube to the motor. Since I will rotate it to high ...
0
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1answer
58 views
how to avoid a clash of magnetic charge and electric charge
now I'm working on a project which involves a dc motor and high voltage. I'm developing a machine consists of a motor to rotate a platform disc and high voltage will be applied during the rotation. ...
0
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1answer
153 views
Multiple Electric Motors on single shaft to improve efficiency
I am trying to build a super-efficient electric boat. The dilemma I am coming across is this:
In normal long range running mode the boat will go at a slow 2.5 knots and only require 400 W power. This ...
3
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1answer
195 views
How to couple/connect shaft to disk?
I'm new to part design/mechanical engineering and I have the following question.
Blue: steel shaft, 5/8" diameter, connected to a motor
Green: aluminum disk, 10" diameter, 1/2" thick, 3" hole
Goal: ...
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1answer
40 views
Establish a controlled rotation on gears
I am a 3d designer trying to build a simple device for my project and I have a problem. As you can see in schema below, point G has weight on it and it needs to be a controlled, vertical rotation. I ...
0
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1answer
63 views
Resistor to limit maximum voltage of solar panels
I have two 20W solar panels (each Voc = 22.3, Isc = 1.22) in series connected directly to an axial fan driven by an EC motor (rated voltage 48V). Here the maximum operating voltage when very sunny has ...
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1answer
52 views
How to control a roller gate using 2 motors - when one fails the other works
There is a gate which is to be controlled by 2 motors, but one should work and when one fails the other should work. AND THE CONTROLLER USED IS A PLC
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0answers
76 views
How to calculate torque requirement for vehicle with Mecanum wheels?
What are the changes specific to mecanum wheels when calculating torque requirements for a vehicle. I have the data for the vehicles mass, top speed and top acceleration.
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2answers
195 views
Do wave washers need to be on either end of bearings in double bearing induction motor
I have a typical small electric induction motor given to me in pieces.
It has two wave washers which I am told should sit between the bearing and the assembly.
I am not sure which bearing needs the ...
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2answers
31 views
Understanding input shaft torque for a motor without a shaft
I'm looking through this catalog at the motorized rotary tables and it says on page 114 that the maximum input shaft torque is 150 oz-in.The rotary table doesn't have a shaft so I'm confused as to how ...
