Questions tagged [motors]

Questions regarding motors. All types of motors, their gearboxes, how to drive an electrical motor etc.

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20 views

Can I benefit from using a real axle as a shaft of a brushless motor on my RC car?

I'm designing an RC car and considering two options now. I can put some gears into it, so that I would have a certain gear ratio between motor and axle, or I can remove shaft from the motor and, ...
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1answer
24 views

How to size motor to pull up a slope

I am trying to understand how to size an electric motor to pull a person up a sloped incline. I know that I need to take into account the speed desired, the weight of the person and the friction/...
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38 views

Selecting the right DC motor for horizontal motion

I have come across a problem that for the life of me I can't seem to figure out. I'm sharing this here in the hopes that the amazing community here can help push me in the right direction. The problem ...
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37 views

Overcurrent protection, limit for nominal current or stall?

Background: I'm currently working on a robotics design that will drill through soil. I have selected a 48V motor who's nominal current is 3.17A and has a stall current of 42A. I will be driving the ...
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88 views

Preventing a DC motor from stalling

My team is trying to build a mechanical cannon for a final project for a course and we are running into some problems with our motor stalling. Our motor stalls when the plate hits either side of this ...
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3answers
48 views

Relation between armature voltage and mechanical power in electrical Engineering

I am searching for an effect chain that leads to the mechanical power $P_{mech}$ of a DC motor, starting with the applied armature voltage $U_{A}$. My request also includes all the electrotechnical ...
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19 views

Absolute Digital Encoder Speed measurement

I am using a 16-bit absolute magnetic encoder and I get the position from SSI 3 wire, I mean digital outputs for my position control application. I have a problem with getting accurate speed data. I ...
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10 views

Petrol-Electric transmission drivetrain parameters

Pardon me if this question covers too many elements; I am not yet informed enough to fully comprehend what would be the important parameters which must be matched for such a system to work, which is ...
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2answers
37 views

How to calculate the required torque in a static equilibrium system

I am working on a personal project where I need to select a motor to rotate a system that is in static equilibrium. The motor torque specification is given in kg.cm. This is what I have: Bar : 2 ...
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43 views

Building a custom indirect actuator, any thoughts?

I’m trying to create a custom indirect actuator, that is controlled by a microcontroller, for a custom robotics project. I have selected motor and gears (according to Fd = W = T2*pi) so that the ...
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1answer
30 views

Fixing a stepper motor by its shaft

Suppose I have a small stepper motor, and for reasons (like wiring considerations) it is advantageous for me to not actually have the motor's body fixed as the shaft rotates, but rather have the shaft ...
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1answer
29 views

Controlling torque required to turn a shaft

I have an shaft/crank that will be turned by the user. I want to precisely and dynamically control the torque required to do so. For simplicity we can think of it as a exercise machine (so the torque ...
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1answer
52 views

Power a microcontroler with a motorcontroller?

I have a motor controller that operates at 10-50V and draws 5A controlling a 3V motor that draws less than 1A. I had a an idea where I want to try to use a microcontroller to control this set up. The ...
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1answer
31 views

Where/why would grease be required on this electric motor?

Here's the nameplate from a 5 HP single phase electric motor - used in an air compressor: Note that it reads: HIGH TORQUE GREASE BEACON 325 which I interpret to mean that you should use high ...
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27 views

DC Motor stops working for a couple if time at cold start every time

We have a DC motor that is connected to the track with couplers. Every day at cold start (when it hasn't run for sometime), when we start the motor while moving up (Z-axis) the motor stops (brakes ...
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2answers
52 views

Can we make a motor without a permanent magnet and with wireless energy transfer?

If we could transfer energy wirelessly with 100% at short range. Then what if we create a motor that have both stator and rotor be an electromagnet? By putting a magnetic coupling to transmit energy ...
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1answer
43 views

How to calculate the torque for motors for a Core XY movment?

I am trying to design a simple setup that follows the core XY movement shown: I have been researching the statics behind this movement in order to calculate the minimum torque for the motor so I ...
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0answers
42 views

PMDC Motor Characteristic Graph

I am trying create a graph similar to as shown below. However, I am confused as to how the torque is related to the characteristics. The graph that is to be replicated for certain parameters: The ...
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2answers
48 views

How do electric vehicles' motors run at high speeds above 10000rpm?

For example, for a squirrel cage induction motor, the speed of operation is given by Ns = 120*f/P depending on the number of pole pairs and supply frequency. Now the supply frequency is 50/60Hz while ...
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1answer
35 views

What forces to consider on a tracked vehicle?

I'm aware that when calculating the power necessary to move a wheeled vehicle I should consider the rolling resistance, gradient resistance, air resistance and if it's a stopped vehicle the ...
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2answers
38 views

With ebikes, is there friction from the motor when riding with the electronics turned off?

One may want to ride an electric bike with the electronics turned off. There are many reasons to do this, i.e. flat battery, fitness (who would have thought) When riding an ebike conventionally, is ...
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2answers
43 views

Sizing electric motor

I've been looking for a way to size an electric motor for a vehicle that could be assumed as a box-shaped load with a mass of 60 kg, up a 10° incline, at 1.6 m/s, using continuous tracks with 1 motor ...
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1answer
24 views

Can you make the magnets rotate inside the coils of Brushless motor?

I know that current brushless motors, have a non rotating core made of copper coils, with permanent magnets on the outside rotating around it, and eventually connected to a shaft. But i was wondering,...
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2answers
59 views

On using gears and a low powered motor

I have system I want to move with a DC motor that requires about 1 kW of power when taking into account rolling resistance, drag resistance and when moving on an inclined plane with a specific ...
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1answer
35 views

How to choose correct motor for my application?

I'm looking to play around with making a massage pad that I can lie down on and has massage nubs that are motor driven. There will be a motor that rotates the nub (the part that does the actual ...
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1answer
45 views

What would be the best mechanism to rotate a plate from 0 to 15 degrees?

I'm designing a machine in a small university project that change position of a two-state gate. The two states shown in the Figure below are 0 and 17 degrees of elevation, correspondingly. The ...
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70 views

250W 24V Motors

(please note that this is a duplicate of a question the electrical forum, however, there are some mechanical subjects that would be better suited here.) I am trying to make an electric go-kart. I am ...
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1answer
30 views

Help with scaling torque and forces?

I am currently designing a ground based digging drill, that hopefully will be accepted by a commercial entity. I am currently working on the preliminary design of the robot and am hoping to move to ...
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1answer
52 views

Determining the torque needed for a servo motor

I'm looking for a bit of clarity on a design I have in mind. Please bear with me as I have no background in physics, engineering and this is part of my first real DIY project, so the knowledge base ...
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2answers
90 views

What do I need to operate this motor?

I am currently designing a tennis ball launcher. I am looking to use the friction wheel approach, where you have the ball passing through 2 spinning wheels and being launched by the frictional force. ...
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0answers
15 views

Motor part winding start

I have a BITZER compressor type 4GE-23Y-40P, with a part winding start option Nennspannung = nominal voltage = 380-420 Frequ = frequency = 50 Betr. strom = maximal operating current = 43.9 ...
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47 views

Why are the synchronous reluctance motors not self-starting?

I have been studying synchronous reluctance motor since a month. I am curious to know why is this motor not self starting? If used with an inverter, this motor can be made self-starting. Or by adding ...
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19 views

Motors for an omnidirectional RC toycar (with mecanum wheels)

First of all, apologies if this is an Arduino question. IMHO, I felt that the questions is more about motors and their comparison. I'm trying to build an RC toycar using mecanum wheels. The vehicle ...
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38 views

How much torque is needed to mix melted marshmallow with rice krispie?

I am designing a robot to make rice krispie treats! More specifically, I want to use a fork to mix the melted marshmallow with rice krispie. I am currently specing out the motor, and since marshmallow+...
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81 views

Energy Wasted in Electromagnetic Motor Actuator Vs Human Muscle Actuation

I would like to know if the energy utilized by a robotic arm is greater compared to the energy utilized by human arm. Robotic arm is essentially servo motors that use electromagnetic field to create ...
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1answer
29 views

Utilizing solenoids in electric motors

I have seen videos of solenoid engines but there were claims that they were inefficient unlike DC motors. I was wondering what would be the most efficient use of a solenoid in an electric motor. ...
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2answers
226 views

Lifting a cabinet using actuators or scissor lift

Disclaimer: I am not an engineer - just a DIY guy looking for some advice or help please, so please forgive me if I use incorrect terminology :) I am building a cabinet that has a hidden inner cabinet ...
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1answer
22 views

Gear mechanism for automatic gate

I have a sliding gate installed on my compound wall. I want to control the gate opening/closing with a motor. I have the electronic circuitry to control motor start/stop. I m thinking about attaching ...
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0answers
41 views

Is there any side effect to soft start an AC motor?

I have a ground to water heat pump for my home heating/cooling (scroll compressor). The 3-phase 15kW-peak motor can be soft started but this option is off by default. I'm aware of all the positive ...
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3answers
87 views

Replicate stepper motor with gasoline engine

For those unaware of what a DC stepper motor is, it boils down to an electronic motor where the rotation can be precisely controlled, i.e. you can control the rotation of the motor in fractions of a ...
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0answers
36 views

Starter direction for methanol engine

I am having a small 2.5cc methanol 2-stroke engine that I am building an electric starter mechanism for. From my research I was under the impression that for a 2-stroke engine like the one that I have ...
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3answers
64 views

Electric go kart

I know this may be a physics question but, will a 48 V 1000 W motor with 3000 rpm be able to move a 500 lb go kart on a concrete sidewalk? And, can I use one 12 V 101 Ah 27 A deep cycle marine battery ...
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3answers
75 views

Torque required to rotate object around axis using Stepper Motor for Kinetic Machine

Hey all, I'm creating a machine to rotate a socket wrench using an arm attached to a motor shaft in order to make clicking sounds from the object therefore I'm trying to choose an appropriate stepper ...
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1answer
19 views

Building an ultralight electric hoist, what gearbox reduction / motor combination for torque / power requirements?

I am building an electric hoist. Design requirements: Lightweight Quiet Relatively low lifting requirements (100 kg) Relatively fast lifting speed (80 fpm -> .4 m/s) Low cost Simple Force ...
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2answers
88 views

Engage and disengage DC motor from free-spinning reel

So i want to have a reel (~4cm diameter) that will pull a ~80cm string with a torque of ~8kg-cm (edit: thanks for the clarification). To pull I want to use a gear motor. E.g. 12V DC motor like this: ...
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1answer
50 views

Torque Required for a stepper motor to rotate a socket wrench ratchet around an axis point

I'm trying to build a kinetic machine that rotates socket ratchet tools (e.g. https://en.wikipedia.org/wiki/Socket_wrench) to make a bunch of ratchet 'clicking' sounds for an art project. I'm trying ...
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0answers
13 views

DIY device to repeatedly depress and release gas pedal on a vehicle

The pedal needs to be depressed about 1/2 to 1 inch, once every three minutes. I believe the best way to do this will be with a rotating arm of length 2 to 2 1/2 inches that has rollers on each end, ...
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1answer
35 views

Is having one large motor more efficient than having two motors half the size?

I wanted to use multiple smaller motors to have the same strength as a large motor but spread out across a wider area. Is that as good as one large motor or is there some efficiency or power loss in ...
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2answers
29 views

How are planetary gearboxes held together?

I see that the housings of most planetary gearboxes consist of 3 parts: a front cap, a ring gear and a rear cap. Here's a common design: In designs similar to this, the rear cap and the ring gear are ...
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1answer
48 views

What is the purpose of the steel plate in this coupler?

I've found a shaft coupler that has a steel plate in between, but it's not clear what its function is: If it is to add strength to the coupler, isn't the coupler as strong as the weakest link, i.e. ...

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