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Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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Is it possible to electronically control the physical speed switch on air movers?

I have a few consumer level air movers (Xpower) that have a 3 speed physical switch. Is there a way I could replace the physical switch with something that would interface with a microcontroller to ...
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Motor mechanical brake troubleshooting

so we have this brake here : It was powered this way in the first place : (Frein means brake in french) But it won't open.. We've tried with a lab power supply, with 24v going at 0.5 A, same thing ...
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25 views

Basic calculations of AC motor

I have a task to find a number of poles and rated slip of induction motor if frequency is 50 HZ and full load speed is 2950 rpm. However synchronous speed is not given. Is it correct to put full load ...
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32 views

Question about motor and generator size [duplicate]

For a given power, which will be larger, a motor or a generator? Is there a certain relationship between motor/generator size and power?
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Poles of induction motor rotor

For a three phase squirrel cage induction motor (IM,) we can have 2 or 4 or 6 etc. pole pairs on its stator and when these stator windings are energized by 3 phase mains supply then we get a rotating ...
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32 views

Induction Motor Poles and Drive Configuration

If an IM is driven by a VVVF drive and the poles of the motor do not match with the drive configs.. eg., IM is 4 poles but the drive setting is 2 poles.. or the other way around.. then can it create a ...
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110 views

Driving MOSFET with 5V PWM for 12V fan speed control

I came up with this circuit to control a 12V 6A fan's speed, with a 5V PWM from another circuit. I'm not sure if it's going to work (I'm not very experienced nor knowledgeable in electronics) and I ...
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24 views

DQ Currents in the Induction Motor Model

While studying the Induction Motor modelling and also its Vector control using DQ currents decoupling method.. I am finding it hard to see which current is which on the model diagrams. Can anyone ...
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53 views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
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103 views

Novice question about high and low speed motors

Why some low speed electrical drives employ a high-speed motor and some form of mechanical speed reduction rather than direct drive motor. Is it because of size?
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24 views

IT characteristic implementation of motor protection circuit

I am trying to implement The IT - characteristic feature for motor protection device.There are 2C,5C,10C curve feature . can someone suggest me how it can be implemented in C code. Is there any ...
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2answers
46 views

My transistor used in a transistor amplifier does not get turned off with PWM based input

I am working on a project; driving a DC MOTOR using an NMOS MOSFET amplifier and Arduino PWM signal. My problem is my transistor amplfiler is always on when I vary the PWM input value from 0 to 255. ...
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59 views

Wiring a 2 pole three-phase DB motor to a VFD

Hello everyone this is my first time posting here so forgive me if my post seems a little choppy. So my dilemma is trying to hook up a 2 pole three-phase DB motor rated at 230 X 3. I did a fair amount ...
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36 views

Run actuator at higher voltage and with lower dutycycles

I have an actuator which is rated at 12 VDC input voltage (0-15) with a maximum allowed duty cycle of 20%. The already existing voltage levels in my system are 5V and 22V, and since I am weight ...
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1answer
30 views

Motor Voltage For Trike [closed]

I am fairly new to electrical engineering, and I am planning to build an electric reverse trike. I am planning to buy a 3kw hub motor from uumotor.com (Model number UMB3K). It states that it can on 48 ...
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1answer
37 views

motor slip vs rotational speed

In Induction motor theory the term slip is used as normalized relative speed of the rotor to the synchronous speed and it depends on the physical rotational speed of the rotor. Is there any special ...
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1answer
49 views

Connecting a 12V LED strip to a 7.4 2s Li-po battery in addition to two motors

I know this is going to be a completely stupid question, but since I'm working with a Li-Po I want to make sure I get this right. What I am building is a modified Nerf blaster that has two motors ...
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1answer
47 views

How to find the optimal speed of a BLDC motor having hall sensors? Can we change the most efficient speed through the controller? [closed]

How do we find the speed of BLDC motor at which it has minimum electrical losses so that we design a gearing system accordingly. And can we change the most efficient speed of a BLDC motor to suit our ...
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12 views

derive Equation between time and current in motor protection device

I am trying to imperilment The IT - characteristic feature for motor protection device.There are 2C,5C,10C curve feature . can someone suggest me how it can be implemented in C code. Is there any ...
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2answers
74 views

What would happen if a rotatable ferromagnetic rod were placed beside a magnet?

If one were to place a rotatable shaft (green circle), made of plastic with ferromagnetic material (grey circles inside green circle), right beside an electromagnet, what would happen? I am trying to ...
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1answer
112 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
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3answers
61 views

AC motors power limitation

power of ac induction motor is limited by which term?? a) A resistance of copper winding b) frequency of supply voltage c) magnetic saturation of iron or d) air gap between motor & stator
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49 views

Confusion with braking-effect of a motor

To have overview I read the information at this link where braking is explained. Now I deal with a motor where it is recommended with a large uF capacitor under the regeneration section. The ...
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Inverse LUT of flux-linkage maps for PMSM

I've been given the LUT of the flux linkages for an IPMSM in the dq-domain. \$\lambda_d = f_1(i_q, i_d)\\ \lambda_q = f_2(i_q, i_d)\$ The maps are obviously non-linear. The sampling has been done ...
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2answers
41 views

Replacing an old 2 speed rotary cam switch with VFD

I bought an old drill press tnw super condor 30l but the motor smoked because of the rotary cam switch is broken. The drill is old and the motor have no motor plate but few engraved numbers 380 and 20 ...
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1answer
104 views

Name of fabric insulator found inside motors

What is the name of the fabric sleeve insulator used for components (typically fuses) and solder joints found inside motor windings? Can regular heat shrink tubing be used as a substitute? Image by ...
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Dividing the rotor circuit by slip in induction motor

In this article equation (3), just after figure 5, they divided everything in the equation for current by slip. I understand that current remains the same when doing this, but voltage and power would ...
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58 views

Difference between Servo Motor, Stepper Motor and Switched Reluctance Motor

I posed a rather cluttered question earlier, by including the servo motor, which is, as pointed out by several of you, is not a specific kind of motor, but a closed loop control system involving servo ...
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1answer
46 views

Controlling speed of 7 DC motors from Arduino 101 using PWM outside of the audible range

I am researching a way to generate PWM for 7 independent DC motor drivers, each connected to a 12 V DC motor. The drivers take in a PWM signal, a direction signal and a 12 V DC supply and use this to ...
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1answer
40 views

Power consumption for an in-wheel motor

I'm trying to estimate the power consumption of an in-wheel electric motor. I used the formula $$P = T\cdot\omega + K_m\cdot T^2$$ where T is the torque, ω is the motor angular velocity and \$...
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1answer
37 views

Problems with Stepper Motor & SN754410

I am using a stepper motor for a project, it is the first time I've used one. The internet said it was very simple and easy but that's not true for me. I bought this motor from digikey https://www....
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42 views

Brushed DC Motor Speed Control

I designed different speed controllers for PMSM and BLDC motors yet, but I never tried to control the velocity of a brushed DC motor. So I gave it a try and didnt expect any difficulties, but it is ...
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1answer
33 views

Dusk dawn motor driver with polarity reversal

I'm trying to accomplish this. When a dusk dawn switch is on, drive a small DC motor for a few seconds and then stop. when the dusk dawn switch is turned back off, then turn a small DC motor THE ...
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2answers
64 views

What will happen if we use an Inductor in place of a Capacitor in Single phase Induction motor

So as the titles says, well i know that a capacitor give phase shift and that results in a rotating Magnetic Field. So i was wondering what will happen if we use a an inductor, i mean doesn't it ...
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24 views

MC33926 Motor Control Rise Time

I am using a MC33926 motor controller. Unfortunately, I am not extremely familiar with motor controllers and have a question. The circuit below shows the circuit that I am working with. The drivers ...
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0answers
33 views

Field Oriented Control 2-Phase Motor

I try to derive FOC for a 2-phase motor, but I'm struggling with the right formulas and I can't find any paper explaining it. The phases of the motor are 90° apart, such that I assume the Clark ...
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1answer
25 views

Using a x-speed transmission with a DC motor

I would like to ask whether there is any point in using a transmission with different gears (like the gearbox in a car) with a DC motor? For instance in an RC car. Are there any benefits to using a ...
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BLDC motor poles versus Torque and RPM

How to calculate the cost of a BLDC motor? Assume I need 24 stator coils of height 10 mm and width 5 mm. Is there any formula for torque comparison with increasing the number of poles?
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1answer
70 views

What actually kicks in a VFD?

I am just getting into the plant environment and the first thing I noticed is that virtually all the motors are controlled by VFDs. I understand that your supply goes into your RST terminals and the ...
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1answer
50 views

Will a start capacitor be damaged by an overloaded motor?

Background: A few days ago, the air conditioning unit at work began failing to start. Fans would turn, lights would be on, but no compressor start. I called a technician and he said the start ...
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48 views

Modelling a Braking DC Motor Speed Controller

I'm trying to simulate a brushed DC motor. The model comes from the following circuit diagram KVL yields: $$v = Ri + L \frac{di}{dt} + K_b \omega_m$$ My rudimentary understanding of speed ...
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1answer
60 views

What type is this fan motor and how best can I control its speed?

This is from an old Westinghouse fan and I am not clear on this motor type and how to best control its speed.
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2answers
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What role does this diode play?

I've just bought an Arduino Uno kit, and am going through all the projects in the booklet that comes with the kit. From even the simplest LED and resistor circuit, to get a feel for the Arduino board, ...
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1answer
65 views

Output voltage of 3-phase in / 3-phase out inverter

I am using UK mains (230 V phase, 400 V line) to drive a Japanese motor expecting 115 V phase, 200 V line), presently using 2:1 transformers. I would like to control speed between 30 and 70 Hz, ie +/- ...
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2answers
73 views

Stored Li-ion battery voltage going up

I have an 8s7p Li-ion battery with a fully charged voltage of 29 V, a nominal voltage of 25.9V and capacity of roughly 20.5 Ah. This battery was used to run a brushed DC motor (rated no-load current 0....
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2answers
69 views

Estimating torque of AC motor

Given voltage, measured current draw, and RPMs of an AC motor, and an estimated efficiency rating, is it possible to calculate the actual instantaneous output torque? Or is other information required? ...
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2answers
41 views

Protecting a relay/SSR when driving AC window cover motor

I'm having trouble switching an AC motor. Relays spark and glue contacts, and SSRs start to flicker and not pass the full input after a while. The motor has 3 terminals for 230VAC mains. One is ...
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0answers
70 views

Three phase motor driver DC link, DC bus capacitor values

I am designing a motor driver for a three phase brushless motor and have been looking for a capacitor value for the DC bus of this circuit (C1). Most of what I have found when researching deals with ...
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4answers
135 views

Controlling DC 90V motor with Raspberry Pi or Arduino

I have project where 90v dc rotating motors(4 of them) must be controlled via Laptop. What is the most simple solution, Can I go with raspberry pi or need to go lower with arduino or there are ...
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5answers
245 views

Soft start for fridge compresser

I live in an off grid property running on 6 12v batteries. We have a 2000w inverter and are trying to get a fridge to run on our system. We have enough power to run it however the issue I am having is ...