Questions tagged [motors]

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1answer
194 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 ...
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3answers
63 views

How does the second Motor operate in this diagram?

The two motors are mounted in parallel as you can see in the picture and each one of them is connected to a gearbox through an elastic coupling. My question is : how do they operate together ? is one ...
1
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1answer
138 views

Measuring motor vibrations

I am measuring BLDC motor vibrations with ADXL345. I use 2 propellers, one perfectly balanced and other bad, which vibrates a lot. The problem is I get similar results from accelerometer with both ...
1
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1answer
53 views

some kind of gearbox for driving a removable shaft; is there a name for it?

This is a noob question, please don`t be too harsh on me. I would like to use a motor for turning a mixer. The shaft of the mixer should be removable and I though of 3d printing a case which holds the ...
1
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1answer
133 views

Speed control of a BLDCM at low speed

I have here a BLDC motor that is controllable with FOC and I already implemented a position controller. The next step is to implement a velocity controller, but I actually don't see how to control the ...
2
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1answer
157 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....
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1answer
235 views

How do I build a dc generator at home for my presentaion?

I'm having a presentation about dc generators and I wanted to demonstrate how it works. Anyone have an idea on how to build one. I left my electric motors at home because of Christmas break, now I can'...
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1answer
74 views

Motor MnM torque max weight can spin circular object

Here's is my problem I am trying to spinal object at high speeds My motors watts is 242.42 My motor max speed is 70,000 rpm My circular rotating object that will be right on motor is 60grams My motor ...
3
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1answer
418 views

DC Motors synchronization

I would like to know how to synchronize two (nearly)-identical DC motors (approx. 1 Amp/12 VDC each) with permanent magnet, while they are driving on the same surface (railroad Track). The problem is ...
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0answers
36 views

FOC current ripples with angle dependencies

I implemented the FOC (Field Oriented Control) algorithm to control a BLDC motor at low speed. A phenomena I observed is, that at different electrical angles, the torque producing current breaks down ...
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1answer
67 views

Larger gear for telescope focus rack?

I am not a mechanical engineer, so just trying to figure this out. I want to attach a servo to my telescope focus, but the servo only has about 180 degrees motion, whereas you need to turn the knob ...
0
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1answer
33 views

Calculation of power for a pipeline crawler

I am an engineering student. I am working on a project where we need to use something called a vertical pipeline crawler. It is just a device that travels inside pipelines for inspection. I found a ...
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0answers
396 views

FOC algorithm for BLDC motor and rotor position estimation via IMU

I would like to implement the Field Oriented Control (FOC) algorithm on my STM32 board for controlling a 3 phases sensorless BLDC motor. By googling I found a very interesting Application Note from ...
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1answer
135 views

Does a sinusoidal input voltage make a BLDC motor into a PMSM?

As the title says, does a sinusoidal input voltage make a BLDC motor nearly into a PMSM? From Sensorless Trapezoidal Control of BLDC Motors, it follows that a BLDC motor has a trapezoidal back emf ...
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1answer
90 views

Figuring out how much torque dc motor will need to run at a certain speed. (E-skateboard project) [closed]

Suppose I want to purchase a DC motor online, how can i determine how much torque my motor will need to run at a certain speed? I.e. 15mph This is for my electric skateboard project and the load on ...
0
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1answer
37 views

How to drive a gear system to wear out fast

i am designing an experimental platform to test some 3D printed gears that i am designing. i want to test the durability and what i am looking for is a way to make them wear out fast. i will basically ...
0
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1answer
309 views

Does Cluster Gear Change The Gear Ratio

I'm designing a gear system which is 1 motor(drive gear) will drive the last gear(driven gear), and there will be a few gear between the motor and output gear. I understand that the gear ratio between ...
2
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1answer
728 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 ...
1
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3answers
1k 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 ...
1
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1answer
137 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 ...
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2answers
88 views

Amperage draw for Servo

I'm trying to find a battery that I can use for a project. Let's be hypothetical for a moment. I have 5-8 of these Adafruit Servos, connected to this Adafruit Servo Shield. Leaving the Arduino itself ...
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2answers
46 views

Terminology for motors with custom bearings [closed]

I am interested in buying electric motor components separately so I can add my own bearings, not use a motor with sealed OEM bearings. I do not know the correct terminology for this type of ...
1
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2answers
116 views

Motor Controller Design Considerations

I'm working on developing a speed controller for a motor that is geared to rotate a mass. Currently, the motor in question has a step voltage applied to it and moves the mass at a relatively slow ...
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2answers
147 views

Designing and fabricating custom gears and sprockets

I need to get a motor from an electric motorbike to drive a single-speed BMX Bike chain, and I haven't worked with bikes/sprockets before so I don't know where to start (I was only supposed to be ...
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3answers
805 views

How to calculate torque required by a motor depending on load?

I want to know whether the torque required by motor depends on load. If it does, then how can I calculate it?
2
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1answer
345 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 ...
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0answers
51 views

Feasibility of a motorized 3-axis gimbal for visualization

Recently some friends and I conceived of a method for visualizing in real-time the pitch/yaw/roll of an aircraft where a model aircraft is mounted inside a gimbal; then, the controller for the gimbal ...
1
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1answer
104 views

Charging a battery pack using a motor

I want to fit a Hub motor ($15kW$ BLDC motor) to my car to convert it into a hybrid vehicle. Would it be possible for me to use the same motor (as a generator) to charge my battery pack, while the ...
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1answer
44 views

Is the same amount of force required to rotate these reels?

Assume the motor on the vertical reel is fixed, and the entire base of the reel rotates on the bottom plate. If both of these hose reels weigh the same amount, will the vertical reel require the same ...
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5answers
271 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 ...
2
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1answer
537 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
136 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?
3
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1answer
35 views

Design decisions for variable speed motor switch settings (vs., say, rheostats)

Why do some variable speed motor switches have the highest speed setting next to the off setting instead of the lowest speed setting next to the off setting? For example, most 3-speed household air-...
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4answers
750 views

How does load force impact load inertia?

I am trying to simulate a winch as a speed-regulated motor that works through a gearbox to lift a mass. The output of the gearbox is a drum, which rotates to accumulate cable. I feel comfortable ...
1
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1answer
309 views

Motorcycle Engine Vibration - Difference between left and right side

I measured the vibration (jerk) on the left and right side of different motorcycles. I tested different engine types: Boxer engine, 3 cylinder, and V4. I measured the vibration on the same route, ...
4
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1answer
250 views

What is the required torque to rotate a 50mm aluminimum plate of weight 100g?

I have a aluminium plate of radius 50mm and thickness 4mm. How much torque is needed to rotate it? In case additional information is required : I have a RS 380 motor, but I guess torque required is ...
2
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2answers
483 views

Torque sensitivity of a VFD induction motor through a gearbox?

I have an application that requires torque limiting and I need to determine if VFD torque limiting will provide sufficient protection. I have used VFDs for torque limiting through gearboxes before ...
2
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1answer
473 views

Do linear actuators need to stay powered once in place? If not, how can I lock them?

I want to build a small remote-controlled submarine, and have been thinking about how to handle the ballast tanks. The simplest option seems to be a piston shaft, which fundamentally needs some kind ...
2
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1answer
42 views

What happens if current provided to mono phase motor is less than rated power

I have a 0.5 kW single-phase AC motor. What happens if the supply is 220 V but can't supply the full current needed? Will the motor torque be lower? Or will it be slower? Will it be any ...
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2answers
87 views

motor to move rope sinusoidally

I'd like to prototype a kind of device to move a rope like a sinusoidal, or similar waveform, it doesn't have to be precise about the waveform, the goal is hide this mechanism in order to show a ...
1
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1answer
773 views

DC brush geared motor: coast vs brake effects on motor/gearhead lifespan

I'm dealing with an application in which I use small DC brush geared motors to move a robot. The motors are driven by a standard FET driver. I do have the option to coast or brake the motor after ...
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2answers
3k views

Dc motors: relationship between PWM frequency and Torque

I am experiencing serious reduction in torque when using PWM to reduce speed - I'm temporarily resorting to 10Hz, and even then, 50% mark-space gives me (at most) half the torque of fully on. I'm ...
1
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1answer
226 views

Stepper motor holding torque without coils energized?

I want to know what torque a stepper motor can hold when stationary. They seem to only have one figure in specifications for holding torque which, I presume, is while coils are energised. How is ...
1
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1answer
352 views

Is there a more efficient transducer to convert mechanical energy into electrical energy than electromagnetic induction? [closed]

I know piezo film has one of the lowest efficiency to date when it comes to converting mechanical energy (or stress in the context of piezoelectricity) and motor (magnet and coiled copper wire) seems ...
0
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1answer
147 views

MMF in AC windings

I have recently studied that the mmf produced by the stator in an electrical machine varies as a rectangular wave over the air gap periphery of the machine; And to make the wave similar to a ...
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2answers
158 views

Energizing of armature as function of position in electric motor

How is the armature in an electric motor energized (i.e. main conditions on signal as function of position)? Let's consider the following parameters: $n_a$,$n_f$ the number of armature and field pole ...
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2answers
124 views

How can I tell if a motor is defective?

I recently bought two 12 V DC motors from Amazon. After I received them today, I tried testing them. One of the two motors run fine but the other motor shows erratic behaviour. It gets very hot within ...
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1answer
1k views

Relationship Between Gear Ratio and DC Motor Power Consumption

In my class, we are currently trying to understand the relationship between gear ratio and motor power consumption. Given two gears, one attached to a motor, and the other attached to a string ...
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3answers
640 views

Can Fast Fourier Transform be used to monitor for fault vibrations in a hard disk?

We want to monitor hard disks for present problems or pending failure. Can the Fast Fourier Transform (FFT) of a given hard disk in question, then, be compared with a reference FFT for a perfectly ...
3
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1answer
147 views

What sensors should be used to analyze vibration of a hard disk?

What kinds of sensors can be used to monitor the condition of a hard disk? We want to be able to detect when a hard disk is not operating correctly. Unexpected vibrations may be caused by spindle ...