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Questions tagged [motors]

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16 views

Finding Required Torque of a Motor to Lift Platform

My group is attempting to size a motor for a gearbox we designed. Inside the gear box there is two spur gears with D=4”. Along the same shaft as the gears, there is a 3” diameter sheave that are ...
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1answer
33 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
54 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
21 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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37 views

Front loading washing machines vs. the never spoken top loading horizontal-axis rotating drum washing machines?

Front loaders are often recommended and for good reasons, in Europe they are the most used type of washing machine, but I always wondered about this type of washing machines: https://en.wikipedia.org/...
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17 views

Calculate additive RPM required in Feed Forward Web Tension Control

In a web tension control system, where feed forward is to be used; a tension set point is desired lets say 20lbs. A load cell system provides feed back A roller on top of two load cells). There will ...
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1answer
83 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
36 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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0answers
5 views

PMDC motor torque constant

I want to find the torque constant of the PMDC motor, but the problem is i don't know the efficiency of gear which is attached in this motor system. Also no encoder is attached with this.
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1answer
40 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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31 views

1 motor vs 2 motors electric go kart

I am in the process of building an electric go kart, and I came across the expenses associated with such a build. I noticed that motors in the 4kw range are pretty expensive. My only option for ...
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2answers
34 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
38 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 ...
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1answer
61 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
45 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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0answers
27 views

Locked rotor torque /Starting Torque of DC Motor

I'd like to know how to determine the torque of a starting motor, and how can I see it if I purchase a DC motor. Thank you.
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3answers
91 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
97 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
56 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
59 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 ...
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1answer
85 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
39 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
59 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
51 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
45 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
62 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
26 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
118 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
19 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
53 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
160 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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42 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 ...
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1answer
78 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
232 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
57 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
72 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 ...
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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
56 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
139 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
40 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 ...
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0answers
36 views

Torque and Power Selection of DC motor

I have an object and I know the Inertia $(I)$ around the axis it needs to rotate at a constant speed $ (w) $. The operating acceleration torque of the load must be the product of Inertia and the ...
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0answers
8 views

How do I design an experiment to measure torque in series DC motor which uses leadscrew to transmit power?

I am designing a variable buoyancy system in which trapezoidal lead screw is used to transmit power from motor to piston using a connecting tube.The piston is used to pump oil in and out of the ...
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0answers
146 views

Extruder torque Calculation

I am wondering if there a formula or a guidebook in calculating the torque of an extruder. Currently I'm studying as an electrical engineering student and I need to choose an AC motor that's able to ...
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2answers
70 views

Running 220V single phase motor on 240V, and did I burn it?

I have a motor thats rated for 220V single phase. My house has 240V single phase. Im trying to run this motor but it doesn't budge and I don't even hear a hum. I know power is getting to it from ...
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2answers
33 views

Motors, Horsepower, RPM and Litres per minute

How do I get a rough estimate of how many litres per minute a motor can push?
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0answers
83 views

Understanding Electric Motor Power, Torque, kV etc, and How to Select Motors with the Right Power for the Job

I've got a project in my head about taking a 1/10th scale OpenRC truggy and replacing the 1/10th scale motor with four smaller motors, one for each wheel, to allow me to do torque vectoring with ...
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2answers
28 views

Motor coupling connection

I choose an AC motor (IEC) with frame number 71. The key on the shaft of the motor is $5mm,$, $4.23 mm$ and $6 mm$ in diameter. At other hand i cant't find a safety coupling (torque limiter) with ...
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70 views

How to regulate torque/RPM on an IWD vehicle

Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic: or also you could check this youtube video. The vehicle is ...