Questions tagged [motors]

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249 views

Dc motors for controlling wheels of a wheelchair

I am doing a project on controlling wheels of a wheelchair. The diameter of the wheel is about 25-30 inches, the weight which the wheelchair is supposed to carry is upto 80 Kgs and it should run at a ...
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1answer
25 views

What is the fraction of power transmitted to the generator in full-hybrid cars?

In full-hybrid cars like the Toyota Prius, usually both internal combustion engine (ICE) and electric motor produces mechanical power to the wheels at cruise. But some of the mechanical power produced ...
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1answer
48 views

Oscillations in motor control systems

I have an underdamped control system for a DC motor. It is only a mathematical model so I can't visualise the motor. I can change the value of the "k" or compensator. I have noticed that changing ...
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1answer
66 views

Selection of correct DC gearmotor with given load

I am designing an Actual working extendable welding station for my college project. The idea is to lift the unit up/down with the help of 2 lead screws and 2 DC gear-motors, one on each side. The ...
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1answer
77 views

Clockwork Motor feasibility?

Why is it that utilizing clockwork motors never came into fruition as power sources for things like vehicles and bolt shooters, in place of compressed air and strings?
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2answers
42 views

Washing Machines vs. Mixers

The motor in a washing machine oscillates at set frequencies as compared to a motor that spins very fast in a fixed direction in a blender/mixer. What I don’t understand however is : Don’t they both ...
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1answer
311 views

What is the purpose of a vacuum cleaner's bypass valve?

I took apart a cheap domestic vacuum cleaner because I am making a small vacuum-forming system, and I only need the motor/fan assembly, so I repackaged it to save space. Inside the vacuum cleaner is ...
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1answer
45 views

Motor for Toy Cars

I'd noticed that for the small motors, the ones used in toy cars, there are rpm values and voltage values written on the specifications. For example, I have a motor at a range of (12V - 24V) and rpm ...
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1answer
182 views

How do I attach an electric motor to a trailer wheel?

I have an electric motor which is intended for a bicycle/scooter and has a 11-teeth chain sprocket. I plan to use it to spin a trailer wheel (which have 4 holes for bolts about 3'' from the center). ...
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0answers
475 views

Determining brushed DC motor inertia for modeling a motor

I'm making an model of a DC motor, and following the guide for measuring motor parameters: I am having trouble measuring the motor's inertia, as the guide for this section is vague. This is a graph ...
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1answer
42 views

How to vary the force output of a motor while stalled?

I want to provide a gradual increase in force provided to a piston (perhaps 0-100N over the space of a couple of seconds maximum), up till the point it begins moving, and then drive it to a varying ...
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3answers
700 views

How to determine the compressor power in a refrigeration system?

The picture below represents a refrigeration unit In order to calculate the power produced by the motor, two quantities must be measured Angular speed of the motor. This parameter can be observed ...
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1answer
96 views

Why servomotor has such low torque compared with stepper motors?

It is easy to found stepper motors with torque over 2NM for a few coins, however, only expensive industrial servomotors achieve this torque. Examples: Stepper motor: 10usd for 1.3nm with 2.8V at 3....
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2answers
76 views

Stepper on high-RPM shaft

The CNC spindle is supposed to operate its single shaft in two different modes: high RPM (30,000-80,000 RPM), variable, possibly quite high torque, a straightforward PID to maintain the RPM as torque ...
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1answer
284 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 ...
3
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1answer
138 views

Which type of electric motor I need?

For an experiment I need to use an electric motor, unfortunately I'm not an expert of electric machines. The electric motor I need has to comply with some requests: It must be brushless. It has ...
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3answers
119 views

How borewell pump works? does water stays in pipe after stop?

I have 6 inch borewell of 1200 feet (domestic use). With camera test, we could see water storage is at 960 feet. i.e approx storage of 200 feet. i.e around 1000 liters. my question is, can we put ...
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0answers
47 views

Rotating four cylinders with one motor/actuator

I have a setup with 4 cylinders placed next to each other in following configuration. The cylinders are made of .2mm stainless steel. I would ideally want to rotate them along their axis using a ...
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2answers
126 views

How does a Y connection in a 3 phase motor create 230V without a neutral/ground

I know that a 230/400V 3phase motor requires 230V on each coil. No more and no less. So on a 3*230V grid it would be wired in Delta, on a 3*400V it would wired in Y. I went to evening school to learn ...
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1answer
31 views

ft-lbs to ft-lbs3 or newtons as well as strength of metal

I am trying to figure out how much torque this piece of metal that I have can deal with before breaking. Are there any tools online that can help me calculate these items? The hardness of this iron ...
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1answer
4k views

Force Required to Lift a WEIGHT of 1Kg [closed]

I want to lift a weight of 1kg so how much force is required ? This is my question. Again I want to mention that 1Kg is weight not mass. I think if i say weight then gravitational pull is already ...
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1answer
50 views

How to determine motor needed for water pump

I can't find what i'm looking for in the engineering stack exchange because it's all way over my head. need basic help answer the basics to get started. so maybe a link or video that helps me ...
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2answers
67 views

Source of a load torque

I am currently taking a course titled "Electric machinery and drives". We have started with the very basics, i.e with the following equation: $\tau_{motor} = \tau_{load} + \frac{\partial (J\omega_m)}{...
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0answers
59 views

Spinning a balanced load with DC motor

Enclosed within a consumer electronic, I would like to spin a small balanced load. The device will be rotated relative to gravity, but no other direct forces will be applied to the load. A coreless ...
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1answer
54 views

2 SPDT relays as motor driver, flyback diodes

I'm trying to use relay as high current motor driver. I'm not sure how to connect flyback diodes. This is my current sketch I've read a lot of on DC motors, but I couldn't find anywhere a schematic ...
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0answers
278 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 ...
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3answers
134 views

How to stop DC-motor with heavy weight from moving?

I'm planning to build a machine which at some point tows a heavy weight on a rope in the air. Once the weight is heigh enough up in the air I want to keep it there for about an hour or so, before I ...
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1answer
187 views

How to calculate if a motor is fast AND strong (torque) enough?

I’m working on a prototype and I’m having trouble picking out a motor for that job. I need it to be able to move a rope that is about 2-4 mm thick outward (like a winch in reverse almost) and I also ...
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1answer
672 views

Torque and Speed of a DC Motor with Pulleys and Wheels

I want to know how to calculate the speed of an electric skateboard If i have that situation(from the picture below) i will need an acceleration=0.16m/s^2? and a force F~=15N? So i will need a ...
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2answers
777 views

Why does the Compressor Fan for an Air Conditioner need a Starter Capacitor?

Our house air conditioner went out last Saturday afternoon on a +100 F day. Was able to diagnose the problem itself as a problem with the starting circuit of the big compressor fan of the outside ...
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5answers
485 views

Can an electric motor use reciprocating pistons like an internal combustion engine does?

Would it be possible to have an electric motor that uses an electromagnet to force a piston up and down to turn a shaft, similarly to an internal combustion engine, but without burning fuel? Is there ...
2
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2answers
96 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 "...
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1answer
49 views

Electric motor bore sizing problem

Okay, I have bought an electric motor, it has a 14mm bore, unfortunately the part I need to affix has an internal diameter of 16mm (5/8"). So, to fix this problem I call upon your experience and ...
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3answers
230 views

How does a windshield wiper work?

Basic Googling on the mechanical generation of oscillating motion (moving something back and forth in the manner of a windshield wiper or a flapping wing) from a source of circular motion comes up ...
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0answers
43 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 ...
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3answers
55 views

Transmission of rotational power across a waterproof boundary [closed]

Considering the situation where: A non-waterproof motor is used inside a waterproof box Something must be rotated by that motor in a wet environment outside the box What is the correct way to ...
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1answer
2k views

How to calculate the power/torque/force needed to move a 4 wheeled vehicle?

I am trying to build a "mule": it s basically a go kart chassis with a 12v dc motor (I figured it would be easier to use). Now I need to determine how powerful should the motor be... It is going ...
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4answers
260 views

Use car starter as motor

I am planning to build an e-bike and I realized that a car starter motor would be a good motor, as it has enough power (1kW, enough for my bike) and the voltage is practical enough. Will it handle the ...
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2answers
511 views

How do you increase the horsepower of an electric motor?

I read that a Tesla Model S P100D achieved 730 horsepower on a dynamometer. Would increasing battery size increase the horsepower? If not, what would?
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0answers
38 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 ...
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2answers
291 views

Building a simple DC motor

I am trying to build a simple DC motor for a project. I used a 9 V battery, 70 loops of copper wire, aluminum foil for the brushes of the commutator, and the commutator is wrapped by Aluminium foil ...
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3answers
53 views

Increasing speed and efficiency of ac induction motor

If you wanted highest efficientcy and speed from an AC motor what would you do? Could the rate of alternation of current be optimizes? More windings? Materials? More lamination? Other factors I haven'...
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1answer
59 views

Transmission for electric motor

I want to build an electric motorcycle ( more of an electric bike, actually), but i don't want to use a conversion kit. I want to take out the pedals and put a motor there (either 12v DC or 220v AC). ...
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1answer
274 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?
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0answers
20 views

Carnot cicle problem

I'm trying to solve this problem in elementary Carnot cycle study: I have two (hot and cold) heat fountains of a motor, in air, at temperatures $T_a = 1500^0$C and $T_c = 10^0$C, respectively. The ...
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2answers
199 views

Modelling a DC motor

I am modellign some examples using the modelling language Modelica. Unfortunately, I am not an electrical engineer, so it is hard to understand the physical behavior of the following example (DC motor)...
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1answer
206 views

What is this contraption?

If this is the wrong place for this question, please migrate it to someplace where it's more suitable. So one of my old teachers from my previous school sent me a contraption to try and figure out ...
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1answer
52 views

AC induction motor

Could the rotor be shaped like a fan inside the stator of an AC induction motor. And could the stator act as a duct. Would this lead to a high airflow:materials used. Thanks
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2answers
131 views

Non-Clutch Vehicle Drivetrain - How Does it Work?

I am making a vehicle simulation, but just noticed a big issue - there are a lot of cars with no clutch in them, but I haven't driven a car with automatic/clutchless-manual gearbox, nor been even a ...
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1answer
73 views

What would be needed to make a tesla fastest car in the world? [closed]

If you were aiming for 300mph then what would need to change and would it be possible. There is less heat so less drag which must be a huge advantage. What kWh battery pack would be needed?