Questions tagged [motors]

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

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2
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1answer
73 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 ...
2
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1answer
63 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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2answers
168 views

How does a two dimensional elevator work?

If you watch this video, you can get a sense of how an elevator can operate in two dimensions. But, what I can't figure out is how it is driven. If you consider a conventional elevator, there is a ...
2
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1answer
517 views

How can I join a 1/2" motor shaft to a gearbox with a 14 mm input?

I need to join a half-inch motor shaft to a gearbox with a 14 mm input (the input is not a male shaft, but a female collar with a 14mm hole). I'm considering using a sleeve with a wall thickness of 0....
2
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1answer
42 views

Raise/Lower 350lb Sawmill Head 12v Motor Specs

I am new to this site and have a problem to solve in an area that I’m pretty lost in. I can usually figure stuff out with the help of the internet and some digging but not getting real traction so ...
2
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2answers
58 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 ...
2
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2answers
49 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 ...
2
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3answers
737 views

PID control of a DC motor with PWM from Raspberry Pi - how to cross dead area?

I'm driving a DC motor (actually a linear actuator) with a Polulu motor controller from a Raspberry Pi. The motor drives if you ask for anything between 20 and 100% duty cycle, so there is a dead zone ...
2
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1answer
341 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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2answers
2k 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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1answer
485 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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2answers
562 views

How much torque will I need to pull a 2250Kg load?

I need to use this to find a motor that will be able to pull at most 2250 kg at a 1.5 m/s pace. At peak acceleration, I would like this to accelerate at 0.5 m/s2. The area that the load ...
2
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2answers
312 views

a small noiseless motor with accurate RPM control?

What kind of motor is suitable for the below requirements? 2700 rpm, needs to be accurate, not +- few rpms. I think the best approach is to use a hall effect sensor and adjust current/voltage on the ...
2
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2answers
101 views

Motor needed for large scale disco ball!

I am working on fabricating a large scale revolving disco ball for an event in Cincinnati. The scale is 10'diameter and the frame is flat bar steel. the exterior is cardboard, duct tape, and adhesive "...
2
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1answer
358 views

Mechanically increasing RPM of ac induction motor

If you spin the stator of an AC induction motor than would the rotation of the rotor increase? Or would it have a different affect such as moving with a higher force?
2
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1answer
253 views

Stall Torque of a DC Motor Less than Theoretical Values

I have an unknown DC motor with specifications I was testing. I used a Prony Brake setup and scale to evaluate torque, a tachometer for RPM, and multimeters for voltage and current. I get a linear ...
2
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1answer
938 views

Suggestion to control a gimbal bldc motor for positioning

I try to understand what the PID controller of a gimbal stabilizer boards (e.g Storm32BGC) does influence? From the IMU we get position and velocity after sensor funsion. The input variable of the ...
2
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1answer
280 views

2 motors on same shaft but 1 is off. How does that work?

I've been thinking about hybrid drivetrains. One thing that is bugging me is operation when one motor is off while the other is on. In a scenario in which the motors are connected with all the rotors ...
2
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1answer
810 views

Calculating correct motor torque for windmill

I am struggling calculating the correct torque needed to rotate a windmill object at the required speed. Suppose I have a windmill: ...
2
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2answers
2k views

How do you calculate the best gear reduction for max speed?

I know that a gear reduction would decrease the RPM if the motor ran at constant speed, but in reality its speed is a function of the load. I first tried turning a wheel with a direct drive system, ...
2
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1answer
45 views

Calculation for Motor Selection

I need help with the selection of a motor and a motor driver I need to spin a 700g (65mm radius) round ball at 35,000 RPM. I need to bring it up to speed slowly, so I also need a motor driver/speed ...
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0answers
111 views

Advice on spring launcher project

I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
2
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1answer
60 views

Automatic compression of springs

I am trying to design something for a friend, but am struggling to come up with the mechanics. Can you help? So imagine a long extendable pole, like a bow staff. Imagine after pulling out a "peg&...
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0answers
43 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 ...
2
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3answers
67 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 ...
2
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1answer
69 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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0answers
88 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,...
2
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2answers
57 views

How can I model a hysteresis curve from data?

I have the task of modeling the current to torque mapping for a given motor. I have an experimental set up where I can retrieve current, torque pairs. Now my initial approach was to model the ...
2
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0answers
491 views

how to calculate required torque and rpm to through a 160 gram cricket ball horizontally at 160km/h velocity?

I am going to design a bowling machine. In this design, I'm going to use two motors that are being placed vertically and their shaft are attached with two horizontal identical wheels with a space of ...
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0answers
51 views

Finding Supply/Nominal voltage for Torque Motor BLDC

I'm a bit confused by torque motors datasheets as it never mentions any nominal voltage. I would like to run a torque motor on a 24 V battery. The required max torque is 150 Nm (=21000 ...
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0answers
179 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.
2
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1answer
1k 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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0answers
131 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 ...
2
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0answers
70 views

Mechanical engineering, Please help me finding the torque and answering other doubts too

Below I attached two BLDC motor commonly used for skate boards, I am confused with the calculation of stall torque for these two motors,What i need to know, What is the maximum weight lifting ...
2
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0answers
429 views

Angular Velocity of motor shaft as function of Angular Position

I have a set of shafts that need to be rotated at a high frequency (~1000 RPM) but not at a constant speed. That is to say, the angular velocity of the shaft needs to be a periodic function of the ...
2
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0answers
46 views

Servo drive gear placement relative to the body

Is there a universal rule for servo drive gear placement? I'm planning to use this servo for a robotics project, but I need to know exactly where the drive gear is located relative to the body. The ...
2
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0answers
40 views

Standard name for "retargeting" behaviour in motor controller

Over the years I've encountered a number of motor controllers (e.g., controllers in the NI Motion series) that incorporate what I usually refer to as "retargeting" behavior. Specifically, if the ...
2
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1answer
599 views

Calculate proper stepper torque to convert clay extruder from compressed air to leadscrew actuator. Is this the correct way?

First time poster here. First of all please excuse my english mistakes but most of all my terminology and ignorance on the subject. Now to the question! A friend of mine asked me if I could help him ...
2
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0answers
81 views

How do I calculate the best mass for the highest linear speed?

I have a motor whose specifications say that its torque is 190g*cm. If I have the formula for the mass of the wheel vs radius, is there any way I can find the radius to get the best linear speed? The ...
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0answers
59 views

How are small refrigerator compressors started?

Small refrigerator compressors in the US generally all have exactly the same design and I am trying to understand their starting mechanism better. How exactly does it work? What I generally ...
2
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0answers
165 views

Validation of transfer function

I have developed a second order transfer function model for a permanent magnet dc motor in terms of speed and voltage. I had performed open loop no load experiments on the dc motor and derived the ...
2
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1answer
46 views

What will happen if we place a couple of separate, small stators around a long rotor instead of 1 large stator around a short rotor?

My original theoretical consideration was using the electric motor's rotor as drive shaft in a car. It led me to this question: "What will happen if we place a couple of separate, small stators around ...
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3answers
4k views

Meaning of O-slash in data sheet about gear diameter?

I have this data sheet for a stepper motor: The pitch diameter of the pinion attached to it is listed as "Ø6". What unit is this? Looking at the wikipedia page for Ø it seems like this is just a ...
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3answers
140 views

Attaching Gear onto Motor

I want to attach a 12 toothed spur gear with a bore diameter of 6mm onto the shaft of this motor (6mm diameter). How would I go about doing this? From what I see, the shaft is smooth so is my only ...
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5answers
388 views

Why isn't it possible to build a car moved by wind power?

So, first of all, I am a High School student and I wanted you to explain me something (in a more "concrete" way, if you know what I mean): I had an idea the other day to make a car with a wind turbine ...
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1answer
1k views

Why do the lights dim when I turn on a mitre saw?

The other day I was sawing some wood on my mitre saw. I have a single light bulb in that room and it was on. The moment I press the button for the saw to turn on, the lights dim a little and go back ...
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2answers
152 views

Why to avoid over sizing a DC Motor?

Someone told me to avoid over-sizing when using DC Motors. Why? Is this because of sparking and higher wear (brushes) while the motor is running at a lower power rating? Can someone explain?
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2answers
65 views

Is a pneumatic cylinder in general a linear or rotary actuator?

I've just begun to learn pneumatics and I'm really confused where the pneumatic cylinder falls under in the categorization of what kind of mechanical motion it is suppose to produce. I've seen one ...
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2answers
64 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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3answers
3k views

Calculate the minimum motor power required to lift a human?

I'm working on a Home-Made Automatic Grappling Hook of sorts, as a project for university. I've designed a Blueprint accounting for everything but (embarrassingly) the motor, as I'm unsure how to ...

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