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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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1answer
94 views

can I use dc 12v motor in kerosene? [closed]

I do want to run a motor under kerosene, before to that I want to know that will it be dangerous or not?
0
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1answer
50 views

Is there anything that can be done about this U5215 universal motor? [closed]

Recently my hairdryer stopped working properly. While drying my hair, the fan would suddenly turn off after a minute or two (it seems as if a thermal switch in series with the motor cut the current to ...
2
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2answers
71 views

Brushed motor with shorted contacts can still rotate

From what I read here and on the internet I understood that shorting or adding a big load to the contacts of a DC motor will make it very hard to turn as a generator. I have a 500W brushed DC motor ...
8
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4answers
1k views

Is there a way to tell what frequency I need a PWM to be?

I have a 12V DC motor that turns at 60 RPMs or 1 Hz. Do I need a PWM that matches the frequency in order for it to work? Most of the ones I've seen are around 25 kHz for a 12V 20A motor.
3
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2answers
357 views

Fan speed and power consumption

Really basic question that I've struggled with for a while. In low-cost fans, a series of mechanical buttons select fan speed. I assume each button is connected to a specific resistor which limits the ...
0
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1answer
66 views

“Motor PWM” vs “LED PWM” on the ESP32

The ESP32 data sheet talks about "Motor PWM" vs "LED PWM". The "LED PWM" seems to be a quite straightforward feed-forward circuit, while the "Motor PWM" also has "three fault detection signals, three ...
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2answers
76 views

Motor choice for quietest (mechanical and electrical) operation [closed]

Which types of motor are the most quiet from a mechanical and electrical point of view? To avoid quiet, but weak, suggestions, the motor needs to be capable of about 70 Nm of torque and speed range ...
0
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1answer
47 views

ESC control with Raspberry Pi

I'm trying to control some ESC and brushless motors using a raspberry pi. I used the pigpio library to control them using servo pulses. But it seems that my motors wont increase rpm after a limit ...
0
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1answer
47 views

Identifying motor

What kind of motor is this and what is the signal used to rotate it? It has 4 coils and each coil has a pin coming out of it except for one coil (number 4) it's only connected to the coils next to it. ...
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3answers
88 views

Can a microwave motor be powered by usb? [closed]

Firstly, I'm not even a beginner. I'd need extensive training to become a novice!! My problem, I'm trying to build a rotating display for some decorative coins. I initially thought of servo motors and ...
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0answers
38 views

Nonlinear Observer Question for BLDC

I'm looking at the article posted here, and I'm trying to figure out what it is that they're controlling and how. Specifically, Dave Wilson from TI gave a presentation called "Teaching Old Motors New ...
0
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1answer
36 views

Powering 3 DC motors (with limit switches) with AC-DC adapter

I have 3 DC motors: each motor is being used to drive an independent system of pulleys. This system of pulleys spins a threaded bar in order to raise/lower a shelf in a linear motion. Thus, I have a ...
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1answer
43 views

How do motors without cooling fins cool down?

I understand that the fan on the motor shaft blows air through the motor fins thus cooling down the motor... However, motors without these cooling fins surely can't cool down the same way. I just don'...
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2answers
128 views

how to calculate the electric power required to rotate an object from 500 gram

I want pull an object (like a rabbit) over grass for teaching my dessert buzzard to catch the object. I made a machine to pull the object about a 50 meters. I can control machine with a remote ...
0
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2answers
75 views

What is the purpose of a 380/220V control transformer when you could just use one phase and a neutral for your motor control circuit?

I've seen a control circuit that uses a transformer in the plant. The supply voltage is 380V. What is the reason for this? Would it not be easier just to tap one phase and use neutral as your return ...
6
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3answers
970 views

Why doesn't a commutator cause the rotation to reverse periodically or stop?

I understand the field magnets attracting/repelling the armature/coil so that it turns one half-turn and then, because the commutator is turned, its contact with the brushes has switched sides, and ...
0
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2answers
104 views

Help understanding encoder

This circuit board is soldered at the back of a dc motor The motor has been removed and a magnetic disc is attached to the shaft and spins over these smd components. They seem to say A87L but I ...
0
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1answer
32 views

Self Inductance in Steady State equivalent model of Brushed DC machine

The First pic shows the model of DC motor under dynamic conditions. The above second image shows the steady-state model of the DC motor. The image below shows the Simplified DC Motor by using a ...
0
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2answers
58 views

Fused disconnect for 3 motors [duplicate]

I want to know one thing about a fused disconnect. If it's fused for a certain amount of current, would you be ok with not adding additional fuses to protect your loads? If you have a 30 A fused ...
0
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2answers
44 views

How to reduce the speed of this motor?

I have an old Siemens motor with this specification : 220V 80W 0.65A I need to reduce the speed (slow down) of this motor. I know it's easy with something like an inverter, but I'm just wondering ...
1
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1answer
56 views

AC motor control with triac or relay

I want to remote control (WiFi/Zigbee) a water pump AC motor, 1 phase or 3 phase depending on the case, with the smallest board size possible. I have used large motor AC contactor in past, it works ...
1
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1answer
65 views

Why does this driver not have a load resistor?

Im trying to drive a motor with this kind of circuit since my micro is an old 8051. The voltage I use is 5V and PowerV is also 5V. I also have a 56 ohm 1/2 watt resistor in series with my motor ...
0
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0answers
45 views

What is the relationship for air-gap b/w rotor and stator for a DC motor?

Q) What happens when we increase the air gap between stator and rotor for a DC motor? Does it have the same effect as increasing air gap for a AC motor? Q) Why does armature current increase with ...
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3answers
148 views

Generator using a 2-stroke nitro engine

I'm designing a generator using a nitro engine and a motor. My design is similar to the YouTube video that I linked below. My main concern is to generate 12 V of electricity. DIY 220v Dynamo ...
0
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0answers
51 views

Type of DC motors for generators [duplicate]

I'm looking for a motor to produce 11V. I'm a little confused about which type of motor should I use. The shaft of the motor is connected to the nitro engine and it will rotate the shaft of the motor. ...
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2answers
69 views

Explain three phase motor running reverse and forward direction [closed]

Determine three phase motor running reverse and forward direction stops just one bushbotton
1
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2answers
67 views

Is it safe to wire an AC-DC adapter directly to a DC motor? (with this setup…)

I just wanted to check that this setup is safe as I am not an electrical engineer, nor am I experienced... I am using an AC adapter which outputs 12 volts DC. It has a max current rating of 6 amps. I ...
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1answer
37 views

OK To Use This Male/Female Jack Combo For 24 Volt DC?

I'm using 24 volt DC motors along with 12 volt solenoid actuators for a installation piece. For ease of install and maintenance, I want to wire each motor with a barrel jack like the one below: ...
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0answers
34 views

calculate phase voltages based on a PWM signal

Is there a method by which I can calculate phase voltages based on a PWM signal? I have as input PWM feedback signals and the DCLink voltage and as output there should be calculated voltages for each ...
0
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0answers
26 views

isolation of Universal motor

Im working on a AC triac motor controller for universal motors For this I want to measure the motor current and the speed. For the speed the motor provides a tacho-signal. To isolate the measurement ...
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1answer
78 views

How this motor can be mounted?

I am a beginner to motors. For one of the projects, I am going to use this stepper motor: https://www.faulhaber.com/en/products/series/am1020/ I am trying to mount this motor to a plate, however, I ...
0
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0answers
69 views

How to adjust speed on a 12v DC gear motor (what motor do I need)

First off, I have no idea what I’m doing, treat me as though your trying to explain this to a child.. I want to take a DC motor, run a shaft (2-3ft) down to a pulley, then run a belt around that ...
1
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1answer
69 views

What is the source of noise in this current measurement?

I'm measuring the current through a 100W motor with a 50A current sensor and I'm getting reasonably good data but there's also a fair amount of noise: This is the current sensor I'm using. It ...
1
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1answer
137 views

Why this H-bridge with only N-channel FETs didn't work?

Based on this answer here in StackExchange and the Motorola article it cites, I've designed a dual h-bridge motor driver with push-pull transistors to switch the FETs faster, layed out a PCB in KiCad ...
0
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1answer
46 views

Motor controller oscilations with flyback diodes

Have some motor controller oscillations with flyback diodes when they were added to the build. They emerge with higher rates of signal amount making by controller. So there is a need to reduce the ...
0
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2answers
47 views

Safe to turn variable speed AC motor on/off via wall switched outlet

I have a (high velocity air) dual AC brush motor pet hair dryer (details). (There is no heating element.) It's rated at 120 Volts 18.5 Amps. It has a rotary knob (listed on the parts page as a "...
1
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1answer
108 views

4 Phase 5 Pin high speed motor driving (turbomolecular pump driver)

I just recently purchased a broken Turbomolecular pump from eBay and repaired it, now that it works again I need to build a low-cost driver for it. It has 4 Phases and normally relies on hall ...
2
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2answers
199 views

(edit) Brushless Motor - Why does the stator burn up if the rotor doesn't rotate?

If I was to apply power to a 3 phase stator, which in turn creates a magnetic field that's projected onto the rotor (with magnets), and (in a friction-less world) would cause the rotor to rotate (...
0
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1answer
40 views

Motor “load” for 8051 does not change based on 8051 GPIO pin

I implemented a circuit very similar to the following (original source: 8051 - Can an NPN transistor be driven? ) to control power to a vibration motor from my micro. I made the following ...
3
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1answer
58 views

Filtering power to stepper motor drivers for EMI

I have been using Allegro A5977 stepper drivers for a while now (a few years) and I had not too bad of a result meeting the EMI compliance targets even for CLASS B. However I went by the seat of my ...
0
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0answers
34 views

Controlling motor card with NI 9472 DO module

simulate this circuit – Schematic created using CircuitLab My goal is to simply turn on/off a 24VAC Motor. It is being driven by a card that I was originally just supplying 24VDC with from an ...
0
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3answers
107 views

How can I determine if this computer fan is dead?

Desktop computer fan started making noise then stopped. We noticed it requires 12V and will run at 200mA. I wasn't sure about that at first. Does that mean it has an internal resistance of : 12V / ...
0
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2answers
51 views

Why is the rotor power factor of the induction motor lagging?

A 460-V 60-Hz four-pole Y-connected induction motor is rated at 25 hp. The equivalent circuit parameters are R1 = 0.15 Ω, R2 = 0.154 Ω, XM = 20 Ω, X1 = 0.852 Ω, and X2 = 1.066 Ω. The rotor power ...
3
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0answers
56 views

What are the advantages for certain types of transformers? [duplicate]

I work designing medium voltage motor starters. Being an mechanical engineer, I still don't understand the advantages, disadvantages, and when to use certain types of transformers. When is wye-wye ...
0
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1answer
55 views

Connecting two motors in series [closed]

I have a 240-volt mains supply and I want to run two identical BLDC motors rated at 120 volts each. Without the need for a transformer with just the help of IGBTs and inverter can I run the motors? ...
0
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1answer
42 views

Induction Motor: Reason why the current locus is on the positive imaginary axis

The shown locus is of an induction motor. I was wondering if there is a reason why the imaginary current of a current locus of an induction machine is positive. Every equation contains a term like \$-...
3
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1answer
64 views

Running or belt conveyor with electric motors and control panel need a kind of certification to be sold in US market?

We want to provide new machinery of a runner conveyor and a belt conveyor in the US market. The equipment consists of: the basic construction (metal parts, runners, drums, and belts), electric ...
0
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1answer
42 views

Battery consumption for four N20 motors [closed]

Hi everyone Electrical newbie here. I wanted to use N20 motors with metal gear box for a 4WD smart car project. There are different RPM version of N20 like 200 rpm, 300 rpm and 500 rpm. If I choose ...
1
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2answers
65 views

Small motor (P<10W) with high torque

I need to find a small motor (max 10W) with a high torque(max 1Nm) and low rpm(max 60rpm). This question has been asked several time but I still have some doubts. I understand that the best option ...
0
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2answers
53 views

Half Bridge Low Side Mosfet vs. Flyback Diode

I intend to use this high side switch in a PWM application with a brushed 12V motor drawing 8A steady state max: https://www.nxp.com/docs/en/data-sheet/MC33981.pdf The switch allows for a half bridge ...