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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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Single battery for different voltage components

So I have a 12V DC motor and a 6V stepper motor. Ideally, I would like both of them to draw from the same 12V battery pack (due to build constraints). The DC motor will be fine but the extra 6V ...
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57 views

What is the output of a PID controller (or any controller in general)?

I'm new to Simulink and I'm trying to get my hands a little dirty there to get used to using it. I'm working on a speed control of a switched reluctance motor. The input signal is to be fed to a ...
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212 views

How can 400V & 690V on e-motors result in the same power

Forgive my ignorance, but how can two 3-phase ratings on the same motor result in the same output power? The one I have is rated for 0.7kW in triangle for both 400V and 690V.
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131 views

Will an AC series motor work with DC supply?

I have read that a DC series motor can be operated using AC supply, but there will be excessive heating in the core and yoke and also a low power factor. So, construction is modified to have laminated ...
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2answers
177 views

PID Run Away Motor Control

I have a PID controlling a DC motor. I am attempting to control the speed of the motor very precisely. My controller allows me to change the direction of the motor and give it a pwm for speed. ...
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1answer
97 views

Need to identify this chip on camera lens mainboard

I need to identify this chip in order to replace on an expensive camera lens. The code TF1 and TF2 are printed on the board to signify the issue is with the focus motor control. The core is 1mm thick ...
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1answer
51 views

AC motor turning a certain turns and stop, then can turns reverse only for certain turns

I bought this motor from some one who said it was used in an automatic recliner armchair sofa. The motor can turn only certain turns [set N] and stop, then can turns reverse only. It can resume the ...
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67 views

When shorting power leads to an unenergized bldc motor, it locks up why?

Why do bldc motors or ecm motors lock up when I short two of the leads on n an unenergized motor. I am a little stumped as to why the unenergized coils are creating a magnetic resistance. Someone ...
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1answer
91 views

If wind rotates my fan, will it cause electrical problems?

I'm planning on building a DIY dryer booster, using this cheapo 220V inline fan: I plan to connect it to a temperature switch and a fuse, and connect it to the exhaust of my dryer. (I'm doing this ...
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2answers
131 views

Is a Switched Reluctance Motor (SRM) a AC motor or a DC motor?

Is the current in a coil of an SRM alternating or not? I understand that we are giving a DC supply (say battery) but isn't the current reversing its direction. If yes, then it would be called AC but ...
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53 views

Motor Braking Issue

I have the following schematic using the motor below. (I did not create the schematic) The only information I have on the motor is what is on the information plate. The current schematic works, ...
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1answer
113 views

microcontroller is “hanging” when it is feeding PWM to a DC motor controller

I am using linear potentiometer to control the speed of a DC motor. I am using the following schematic. An ATmega328P receives the value from linear potentiometer via analog read. This ATmega328P ...
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1answer
64 views

How to drive 4-pin fan

I've been attempting to get this 4-pin brushless dc pc fan working for some time now. It has a red (+) black (-) blue (PWM in) and yellow (tachometer out). I only want this fan running at maximum ...
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2answers
173 views

Is there back EMF in an induction motor?

I noticed that in deriving the equivalent circuit for an induction motor in the rotor component, that a "variable" resistance was introduced. This really confused me as I didn't understand how power ...
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2answers
51 views

Little torque of single phase asynchronous motor

I have a single phase asynchronous motor rated 230V, 500W. It has three terminals labeled U, V, W. I connected L1 to U and N to V (other way round makes no difference though). Between V and W is a ...
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78 views

DC Motor Winding Insulation Material

As I understand it, the field coils and armature windings in a DC motor are insulated and this insulation can 'burn off' if the motor overheats, causing a short circuit to develop. What is the ...
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1answer
53 views

Why do we divide by slip in the Rotor equivalent circuit for an Induction motor?

I was reading this article and everything made sense until the equivilant circuit for the rotor was divided by the slip s. I understand that the current in the circuit would remain the same, but it ...
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0answers
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How to increase the speed of a specific AC motor

Here are details of this project: The motor being used is a 2 phase Slo-Syn model SS400 (1/4 HP). The motor has two 120V windings that are physically 90 degrees to one another. It is operated by ...
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3answers
8k views

Fan speed switch: why OFF :: HIGH :: MED :: LOW?

Many AC fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to ...
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1answer
51 views

stall dc motor 12 volt for long time

hi every one i make water cooling system for dc motor 12 volt how can i make the dc motor hot to test the system ? whan i stall the dc motor the wires get very hot before that effect the motor and i ...
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45 views

Synchronous Motor Power and Frequency Relationships

I'm having a difficult time trying to understand what effect the frequency of a power supply has on the power of a synchronous motor. For example, if the supply frequency were to increase from 50Hz ...
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1answer
58 views

Best way to develop a kapton tape cutter machine? [closed]

I'm constructing a machine that cuts kapton tape in a specific length, the way I'm doing is there's a motor that keeps pushing tape forward, when the tape covers an infrared led, the motor stops and ...
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2answers
99 views

What if the current draw is greater than the rated discharge of a battery?

I have a 48 volt, 20 kW motor that I need to supply with power. I am looking at a configuration of 16 LiFePo4 cells each in series, each 200 Ah rated at 1 C. At that rated capacity, it would seem ...
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1answer
91 views

Pulse width of a stepper driver

I have a stepper motor that has 1.3Nm holding torque. Im using TB6560 driver at 3A phase current and half step mode. And also Im using Arduino for generate step signal for the driver. If I generate a ...
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1answer
54 views

Making a DC motor turn in saturation and cutoff modes of an NPN transistor

simulate this circuit – Schematic created using CircuitLab So I have a DC motor that should turn with light on LDR and should stop when I cover LDR or turn off the lights. Basically the ...
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1answer
45 views

Motorization of a Shaft

I know this is an awkward one, but need some answers. Is it a good practice to fix/lock the shaft of a motor, and consequently the body of motor shall start rotating? Essentially, there is a shaft ...
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1answer
117 views

Two 9 V batteries in parallel

I don't know where else to ask this question and I think this is the best place so I'll ask here. I'm making a remote controlled boat that uses two DC motor controlled by a L293D motor driver chip. ...
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1answer
72 views

hard drive BLDC motor

I can't work out what the issue with my setup to control a 2.5" hard drive BLDC motor is. I have a 3 pole 2.5" hard drive connected to the following drive circuit, but the motor isn't spinning. ...
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1answer
64 views

2 x 2 n-channel mosfets in series: does my circuit has any flaws?

For a hobby project I would like to switch between two power supplys. The load are two motors which can also be switched on and off separatly. The two motors are BLDC controllers in reality. I am only ...
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2answers
136 views

Do electric motors have the same efficiency when operating as generators?

Its in the title. I'm just curious and it turns out that either this is such a stupid question that no one has bothered to answer it, or i'm just not good at googling today. I guess I'm thinking ...
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1answer
42 views

Increase rotational velocity of synchronous motor

I recently got my hands on a Philips PM8110 (a single pen recorder which is basically an analog printer for voltages) which sadly provides paper with a velocity of 8 cm/hour. Although this would ...
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3answers
65 views

Surge or other suppressor I can use, to prevent tool blowing fuse if blade sticks [closed]

I want to say up front, that this question involves minor modification (transient surge/current suppression) to the power supply side of a power tool. Usually I'd be the last to do anything like this (...
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2answers
98 views

Why is my DC motor losing torque when over voltaged

I have these small dc TAMIYA motors rated at 3v at around 2-3 amps. I also have a driver that I'm planning to use to drive the motor. https://www.pololu.com/product/2992 I could not find any other ...
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1answer
41 views

What are the d and q axes for induction machine?

What are the d and q axes for an induction machine (physical meaning)? I understand them for a synchronous machine but how are they defined for an IM?
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1answer
67 views

Protection diodes

What are the rules when placing protection diodes into a power supply schematic? More exactly, I have the attached schematic and I placed the protection diodes (D2, D3, D4 all of them 1N4007). Those ...
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2answers
565 views

Why does the capacitor affect the speed of the motor?

I recently watched This video about an air purifier made from an old oscillating fan and at 5:20, he explains that the motor's speed has decreased over the years because the capacitor "isn't as good ...
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3answers
808 views

How is air conditioner room unit fan motor controlled?

I have a custom project where I need to control fan speed with Raspberry Pi according to data it gets from various sensors. At first I need to know what my motor needs. For fans I use old air ...
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1answer
36 views

Syren 10 A motor driver stopped working [closed]

While I was measuring current going in the motor terminals , sparking occurred and the power supply also stopped working including the motor driver, as soon as I connected multimeter across motor ...
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1answer
70 views

How powerful would this motor have to be?

I’m attempting to make and electric barrow (like a wheel barrow) which needs to push up to 100 kg up fairly large hills. I’m assuming it needs to be 24 V but I don’t know what power (watts) ...
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1answer
72 views

Control of a D.C. motor reversing contactor

I've got a forklift with a partially functional motor controller. As I've got a bit of experience with electronic engineering (as opposed to electrical), I have a few questions that I was hoping to ...
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1answer
73 views

Problems calculating torque for a motor opening a door

I want to make a device that can open a door from a cabinet. The door is about 4 meters wide and about 0.5 meters high. (if the width causes a problem I can split it in 1 meters section with one motor ...
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2answers
48 views

MC33926 Motor Control Feedback Reporting Too High

I'm using an MC33926 motor controller that has a feedback pin which current mirrors the motor current. According to the data sheet the mirror is 0.24% of the actual current, so the FB pin should ...
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1answer
98 views

Pull-up scheme for Hall effect sensors on a BLDC

I looked around on here, and used google, and couldn't find a direct answer to this question. Please forgive me if I overlooked something. I am working on a board to control a BLDC motor (BLWS231D-...
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0answers
29 views

How can I get/calculate simulink bldc parameters

I tried to get the parameters for a bldc simulation https://de.mathworks.com/help/physmod/sps/ref/brushlessdcmotor.html I tried to find a similar motor to the I need (500 W, 20-25 Nm, geared bldc) ...
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1answer
49 views

Accurate localization of a remote vehicle

I've been working on a project where I'm supposed to design a vehicle that carries antennas to perform SAR (Synthetic-aperture radar) imaging. This vehicle has 3 wheels which 2 of them steered by a DC ...
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0answers
29 views

how to choose/design a capacitor value for surge current(for protection) for DC brush motor?

I am driving a DC BRUSH Motor at 30.V.D.C and the current is 300 Millie ampere, it is powered by L.M.317 I.C .My sir is suggesting to provide a capacitor as a protection form surge/peak current ...
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98 views

Noise in BLDC motor with 32kHz PWM

I built a controller with FOC for BLDC motors and it works well for most motors I tested so far, but as it comes to motors with low resistance and inductance, I hear a noise, that sounds like water in ...
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2answers
446 views

Would it damage a tile saw if I used a a dimmer switch on it? [closed]

It's a 10 inch Ridgid wet tile saw from home depot. I have a dimmer light switch, and I was hoping to use it to slow the saw down about half the regular speed. Would doing this damage the motor or ...
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2answers
263 views

BLDC Motor Constants: Why is my Kt and Ke different?

I'm new to working with motors. Reading up on BLDC theory, it is repeatedly said that in SI units, the Ke and Kt will be numerically equal. I downloaded the motor spec excel sheet of the T1101 motor ...
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56 views

Can the metal body of a dc motor be used as negative terminal for that motor?

I need to power a micro DC gearmotor (6V, 0.5A), but due to the position in which it needs to be placed, i can only access the positive terminal (of that motor). It is possible however to connect the ...