Questions tagged [motors]
The motors tag has no usage guidance.
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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
47 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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16 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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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
34 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
36 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 ...
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1answer
24 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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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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11 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
27 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
35 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
18 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
9 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
37 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
58 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
712 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
44 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 ...
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2answers
44 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
44 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
87 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
47 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
122 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
99 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 ...
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1answer
57 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. ...
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1answer
106 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
131 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 ...
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1answer
61 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
64 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
111 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
29 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 ...
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2answers
49 views
Power torque and rotational speed of a not running yet DC motor
If the power $P = C\omega$, so how a DC motor powered by $P = 10\text{ W}$ can work as $\omega$ is of course 0 rad/s at first, because if $\omega = 0$, then $P = C\omega = C\cdot0 = 0$?
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2answers
204 views
Coupler to connect motor shaft to perpendicular rod/shaft
I have a stepper motor (this one). Its shaft is of type "oval" or whatever, so like a circle but with 2 flat sides.
Imagine the motor shaft pointing straight up, in the z-axis. I want a 6-inch rod, ...
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0answers
21 views
Calculating the proper power of a motor
I'm trying to build a filament extruder with some basic available tools and materials. Simply the main principle of the machine is to insert some amount of plastic raw material ( ABS in our Case ) to ...
2
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1answer
81 views
Calculating the torque requirements of the motor for a specific case
I want to use a DC 12/24V motor to rotate an assembly of glass tubes(image attached) through a hollow shaft of 25mm OD and 22mm ID, the shaft is supported on bearings on both the sides(assume minimum ...
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2answers
249 views
How much could this motor lift and how fast?
How much could this motor lift and how fast? If I connect a belt to its axis about 1cm away or even 10cm away from its tip.
Torque: 1.5Nm
Peak Torque: 10Nm
Power: 9-30A, to 1000W.
https://www....
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0answers
62 views
Driving parallel shafts with single motor and torque required to drive them
I want to drive 4 shafts in parallel with a single motor. The shafts will be driven by chain drive using double single sprockets as shown in figure. If 1 kg-cm of torque is required to drive a single ...
2
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1answer
114 views
Stepper motor skipping steps
I'm using two stepper motors (datasheet below) to pan and tilt a platform. The bottom motor spins fine without the breadboard glued to the top platform. However, it behaves unpredictably and skips ...
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0answers
325 views
How does one calculate torque required to lift a quadruped body with gear-worm driven legs?
I am designing a quadruped robot with legs driven by gear-worm motors as opposed to hydraulics or pneumatics. However, I am stuck at the calculations for the motors, motor drivers, and power supply ...
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1answer
74 views
What is your best recommendation to optimize the torque/speed relationship of a motor?
I'm a engineering student currently taking Thermodynamics and we have this project for our finals which is a sort of reeling /towing device, the assignment consists in a reeling motor that has to tow ...
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1answer
73 views
smallest highspeed stepper motors?
In my project I've been using galvo scanners for rotating small mirrors but they seem like an overkill at this point for several reasons:
1) Even though I use the slowest and smallest scanners out ...
2
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1answer
50 views
Where is the resistance in my DC hub motor coming from?
I'm designing an electronic speed controller for an electric bike and I recently mounted my wheel and performed some tests. The wheel (an old 24V brushed DC motor) works pretty much exactly how I ...
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0answers
58 views
How do I calculate the velocity of the piston?
I have a system with a motor connected to the trapezoidal lead screw. The lead screw is connected to the tube which is connected to the piston. The piston has to pump 1000cc oil against a pressure of ...
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0answers
226 views
Design torque calculation for an electric vehicle
We are building an electric vehicle. How is the required torque determined for our vehicle for a given total weight of the vehicle, highest vertical gradient and maximum acceleration? We need this ...
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2answers
42 views
Is hall sensor also used in PMSM drive scheme as like used in BLDC motor?
I am little bit curious about, is hall sensor also used in PMSM motor drive? Since in PMSM motor the voltage applied is sinusoidal, all 3 phase are active, so a rotating flux is introduced, which is ...
