Questions tagged [motors]

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

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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
28 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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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
44 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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32 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
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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
20 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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57 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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32 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
44 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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68 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
29 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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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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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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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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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
27 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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185 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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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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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
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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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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
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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
52 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
36 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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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
32 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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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
47 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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Secure loads to gearbox shafts

I have a sculpture that is designed to rotate over 3 axes at max. 30RPM and is mounted on an aluminium disc. My plan is to use 3 of these geared steppers and secure the sculpture to the Z-axis shaft, ...
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32 views

What is the fastest possible slot car

What is the fastest possible slot car one can build? What are the limiting factors? Obviously, we have to require that the motor is aboard the car and that it's propelled by the wheels (we don't want ...
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Is having a keyway in aluminium for 30Nm a bad idea?

I'm designing an aluminium shaft hub for a 16mm keyed shaft with a maximum torque of 30Nm. However, stress analysis tells me that the keyway can suffer too much stress: If my understanding is correct,...
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56 views

Is the viscous friction coefficient of a BLDC motor dependent on the system inertia?

I have to model the required torque to move a system composed of several mechanical parts such that this system performs a motion profile. It is a Maxon drive composed of an ECX Speed 16L BLDC micro-...
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Could you use anything as a fuel source for an engine or motor, if it's designed to use that specific type of fuel?

By anything I don't mean to put some random liquid in a car engine, but is it possible to design and build an engine or motor that could use something like tea or orange juice for it's fuel? I know it ...
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62 views

How to connect a motor shaft to a plate

I'm trying to drive an aluminium plate using a motor via a 20mm-wide 2mm-thick stainless steel tube. The tube is driven by a 6mm motor shaft via a pulley and the torque will be around 5Nm at most. Is ...
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1answer
78 views

What signals are expected on the connectors for this 12V Volkswagen Scirroco wiper motor circuit

EDIT: added a picture of a very similar unit. I picked up a used VW rear? wiper motor that I want to use for a simple motion experiment. Having no idea how to power the thing I popped open the case ...
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1answer
37 views

How to connect Arduino to brushless motor through only 1 digital pin

I know how to connect motor to Arduino with 3 wires: 5v, digital pin and ground. As I know only digital wire need to control "speed control" of my motor. So, if my Arduino connected to computer and it ...
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Does AC consume more electricity if it is showing less current?

A air conditioner has label 9 amp of current and 2000 Watt. But in actual reading it is showing 7 amp.(may be due to any fault, i.e. low Gas in compressor) Does it consume more electricity or less ...
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25 views

What are the characteristics of a motor that will generate current and is powered by a 30 cc, 2-stroke small engine?

Problem: I am trying to hobby-build a generator using a (old, working, throw-away gas, yard blower) 30 cc, 2-stroke engine. The 2-stroke engine will spin a motor and I want the motor to generate DC ...
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40 views

Why would a specfication for a motor require that overtemperature protection be realized by modeling heat generation and not with an embedded sensor?

I'm reading the procurement documents for the R211 railcar contract, which is for electric multiple unit subway cars designed for rapid transit applications in New York City. The railcar's propulsion ...
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28 views

Calculating force transferred from pinion gear to rack

I am really challenged as I need to fit a bunch of motors in a 6" box acting as linear actuators. I was looking for linear actuators (most I found were brushed DC) at first but the ones I found that ...
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1answer
33 views

Basic intuition for motor torque

when shopping on digi-key or other electronics distributor, I can see the Torque - Holding spec, given in oz-in and mNm. I understand Nm in a torque context when the force is applied as a lever at a ...
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Magnetization characteristics and static characteristics of SR motor from Ansys Maxwell. Part II

Continuing the topic: Magnetization characteristics and static characteristics of SR motor from Ansys Maxwell Are there any people in the community who are more or less familiar with Ansis Maxwell's ...
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What kinds of electric motors can produce a lot of power at low RPM?

Are there electric motors that can produce a lot of power at low RPM? Why couldn't a motor produce as much power as needed if you give it enough voltage? Why would an electric motor be able to produce ...

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