Questions tagged [motors]
Questions regarding motors. All types of motors, their gearboxes, how to drive an electrical motor etc.
354
questions
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30 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 ...
1
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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 ...
2
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0answers
27 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 ...
2
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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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1answer
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 ...
1
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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 ...
2
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2answers
39 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 ...
1
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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,...
1
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2answers
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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1answer
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 ...
1
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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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2answers
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 ...
1
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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 ...
4
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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. ...
1
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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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0answers
32 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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0answers
18 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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0answers
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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0answers
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. ...
5
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2answers
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 ...
-1
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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 ...
3
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0answers
39 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 ...
0
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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 ...
3
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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
64 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
18 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 ...
1
vote
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:
...
1
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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 ...
1
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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, ...
1
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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 ...
2
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2answers
26 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 ...
1
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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. ...
1
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0answers
18 views
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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0answers
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 ...
2
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0answers
33 views
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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0answers
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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2answers
24 views
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 ...
4
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2answers
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 ...
0
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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 ...
0
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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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1answer
17 views
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 ...
1
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1answer
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 ...
5
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1answer
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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1answer
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 ...
1
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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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0answers
4 views
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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2answers
36 views
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 ...
