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Questions tagged [dc-motor]

A common actuator in robotics; it's usually made of a static magnet (stator) and a set of moving inductors, acting as electromagnets, connected to the circuit through brushes. Brushless motors use phased clocks with electronic circuitry to generate motion.

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2answers
39 views

Transistor Limit Current

I am using a LM395T transistor for an inductive load (a motor). The voltage limit is well within the 36V threshold. But current isn't limited. The specs of the transistor say that 1.5 A is maximum. ...
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1answer
64 views

Braking with less resistance

I have a 500w dc motor that I want to brake with a power resistor. Using ohm's law I can calculate the resistance needed like so ...
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0answers
25 views

What MOSFET should I use? The number and some advice [on hold]

I have a DC motor 24V 150W and I need to control the speed of the motor so what is a good MOSFET for my application? The control signal is done by sending PWM from an Arduino Uno.
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1answer
45 views

DC brush motor EMI

What kind of frequency does a DC brush motor generate? There are a few explanations online as to what causes EMI in DC brush motors (commutator sparking for example) and how to reduce it, but no ...
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1answer
31 views

Is it possible to influence the working behaviour of a simple dc motor with an outside electromagnet?

I am using a simple DC-Motor 9V like this one. Now, I am curious about what influence an outside magnet / magnetic field would have on the working behavior of this motor? I would like to use the ...
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1answer
51 views

What is the maximum current limit of this motor?

I am confused about the maximum current limit of this DC Motor. Rated Power is given as 220W and Rate voltage is given as 24VDC. According to this maximum current should be 9.166A. But 2.5Amax is also ...
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0answers
32 views

motor driver voltage [closed]

I am a complete beginner working on my first project. I need a motor which will be controlled by a raspberry pi. I see that to do this I need the intermittent motor driver. How do I tell if a motor ...
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0answers
62 views

How to protect a CONSTANT current DC motor from stalling?

What would be an efficient way to protect a DC motor that draws CONSTANT CURRENT (always 300mA) from self destroying when stalled for too long? Or is this even necessary on brushed DC motors? On other ...
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1answer
36 views

How to start separately excited motor with 4 point starter

How do we connect a 4 point starter to a separately excited dc motor? Do we keep the F terminal open?
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1answer
54 views

Resistive braking of series wound DC motor

I am looking at braking a series wound DC motor by putting a resistor across the motor feed terminals. All of the sources that I have looked at state that the polarity of the field winding needs to ...
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2answers
37 views

Physical principle of the torque of DC and BLDC motors

I have watched several videos about this topic. According to these videos, the torque of DC motors relies on the Lorentz force (a force that acts on moving charged particles in a magnetic field). ...
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1answer
36 views

How brush shifting affects current distribution in dc machines?

I understand that how armature reaction causes neutral plane to shift by some angle . If brushes are placed along Geometrical Neutral Axis, then there'd be sparking during commutation as voltage ...
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0answers
75 views

How To Run Shaving Machine Without Bettary? [duplicate]

I'm just an amateur in this and I Need Help.. I've drawn this circuit of my Shaving machine and I want to remove the battery and connect it directly to one of these phone chargers-: The first: ...
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1answer
70 views

Help with some capacitators

So i have some 10ųf capacitator s that i think can withstands the maximum voltage and current input of 11.1V and 3amps but they are extremly small and the legs are really thin ,just kinda need the ...
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1answer
61 views

Why does my IR receiver spit out random codes when my motor is on?

I'm learning electronics and trying to understand why my IR receiver spits out random codes when my motor is on. I have a basic setup with this: Arduino Power supply set to 5V IR sensor receiver ...
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2answers
42 views

Trying to measure start current of a DC motor

I have an 12V DV electric winch I am attempting to power with a power supply. I am only pulling about 150 lbs and I want to know what the... Start up current Running current The winch starts and ...
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2answers
42 views

Voltage divider in parallel with DC motor driven by H-Bridge: can someone explain me this circuit?

I have a battery powered device with a PCB wich control a small DC motor (3V). With a little bit of "reverse engineering" I darw this schematic: So there's an 8-bit IC (STM8L052C6) that drive the ...
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1answer
88 views

Electric motors high volts low amps vs low volts high amps

I have a little electric motor that im trying to use to spin a turn dial. I tryed useing a 5volt 1.55 amp power supply but it just dont have enought power to spin it. I can hook it up to my portable ...
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1answer
35 views

How to get right voltage output with Bts7960b H-Bridge?

I am using a NodeMCU to control a BTS7960b motor driver. (datasheet of the BTS7960) This driver controls a 12v dc motor. This image shows my wiring (without the display and the buttons and with a ...
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2answers
178 views

Feeding microcontroller and linear actuators (motors) with the same power supply

I have already made a diagram using a motor controller. The details of the actuators are: Input voltage: 12VDC Max Load: 750N(168.607lbs) Stroke Length: 16 inch Travel Speed: 12mm/s Duty Cyle: 25%. ...
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0answers
62 views

Half H-Bridge Control

I need to control a Half H-Bridge circuit to move a DC motor on both clkwise and ctrclkwise directions. I've tested the following circuit: It worked as it was supposed to: when the digital input ...
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0answers
23 views

How to start with this ESC? Some simple questions [duplicate]

I'm building an autonomous boat for which I've been using a brushed DC motor. I now want to try my luck with a brushless DC motor. So I just ordered this brushless motor and I still have this ESC ...
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1answer
74 views

What is the use of a capacitor in a DC motor circuit?

I'm trying to understand all the components I need in order to drive a DC motor through an Arduino. I saw this circuit below, which has a capacitor (other sources show same circuit but without the ...
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2answers
89 views

Half H-Bridge Driver

I'm working on a project to control power sideview mirrors in a car, with features like TildDown, that tilts some of the mirror down helping to park. The circuit is pretty simple, but I'm having some ...
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2answers
98 views

Running an electric motor beyond its ratings

I ordered a 36V 500W brushed DC motor but unfortunately a 24V one came. I'm faced with the dilemma of returning it and waiting for a month before getting a refund, then ordering a new one and waiting ...
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1answer
51 views

'b' in mechanical equation of Dc motor?

I am trying to study/learn mathematical modelling of a DC motor i came across an equation which is known as the mechanical equation for an armature-controlled DC motor I have understood other ...
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4answers
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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.
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2answers
44 views

How to use a MOSFET driver directly to drive DC motors with PWM?

I need to control a DC motor runs at 9v with PWM signal 3.3V vpeak. I found MOSFET driver noninverting MCP1401. Can this MOSFET be used directly with a Back EMF diode (diode as usual across the ...
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2answers
102 views

How to control 12 DC motors simultaneously with Arduino Uno?

I am using Arduino Uno. I need to control 12 dc motors rated voltage 9V and current 150mA. definitely, I will use MOSFETs and back emf diode for each PWM output. I need to know whether I can use a ...
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1answer
42 views

Why are stepper motors sometimes rated in AC voltage?

Now, I think I get why steppers are rated at (for example) 48VDC - as I beleive it's to overcome any back-EMF, and that's why stepper controllers are typically constant(/max) current devices - they'll ...
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0answers
42 views

why wouldn't a 9-60DCV 20A PWM motor control work to control a 12v 20A wiper motor [duplicate]

I have a question regarding controlling the speed of a wiper motor with a PWM vs wiring in a rheostat in the positive side. I have a 110ACV-12DCV 20A converter going to a 9-60DCV 20A PWM motor ...
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1answer
102 views

PWM Brushed DC Motor Noise

I am driving a brushed DC motor (internal to a linear actuator) off of TI DRV8872 motor driver. I am PWMing the motor driver at 20kHz and varying duty cycle to control the speed. The problem is that ...
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2answers
74 views

Motor freeweeling and regenerative brаking FOR DUMMIES

The project I'm working on is an electrically powered vehicle. I have found this fairly simple circuit to control my motor's speed. What I understand is that when the transistor is closed the battery ...
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2answers
74 views

Motor with two endstops using limit switches

I have a circuit where two limit-switches to be wired with motors to do the following functionality. It is to be used in a remotely placed device so that the intervention of microcontroller on the ...
0
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1answer
44 views

Help with brake in motor control

I have build a simple motor control for a brushed DC motor for my robotic mower. The motor is feed with a PWM signal and when the cutter should stop you just pull the PWM signal low to stop the motor ...
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1answer
51 views

How to measure current to detect motor stall on H-Bridge driven motor?

I have DC motor with a gearbox to transforms the rotational movement to linear movement and movie a pin back and forward. I need to know when the pin reaches the two positions: full back or full ...
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2answers
91 views

Why use both big polarized cap and small non-polarized cap in the TB6612FNG DC motor controller terminal?

In the datasheet of TB6612FNG DC motor controller, Typical Application Diagram section. Both DC sources are smoothed by caps. But I don't understand why there are two caps in each position. The ...
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2answers
107 views

DC motor in vacuum, heat generation

I am designing a motor system that has to run in a vacuum chamber (sub mbar). I am a little bit worried about the heat that would not dissipate at all in the vacuum. Therefore, I want the least amount ...
0
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1answer
33 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 ...
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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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1answer
45 views

Controlling 12V 70A Motor(s) with Arduino MEGA (or NANO) and a 4-terminal automotive relay

Components I have: Relay (rated at 12V, 70A, cannot find how much current is needed to saturate its coils) Schematic Arduino MEGA and NANO 12V Powerwheels battery + AA battery packs Motor: 00968-...
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1answer
71 views

If I have a power tool in a wood box do I need a ground? [closed]

I am using an old treadmill motor to build myself a variable speed disk sander. The motor is a 2 1/2 hp DC motor and I am using an mc-60 speed controller. I am wiring it all up according to the ...
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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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3answers
53 views

Full-bridge or half-bridge for a DC motor

So I have a DC motor which draws around 16A at 12V. I want to have some room to play with in the top values. I need to control the spinnig direction as well as speed. I understand how half-bridges ...
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5answers
96 views

Size a power supply for a DC motor?

I'm wondering how to size a power supply for DC motors. I have a 70W 24V brushed DC motor [Linix 63zy24-70-A I picked up from a surplus store]. I intend to control this using a PWM/MOSFET. If 10 ...
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0answers
35 views

Driving a PWM controller with an SMPS - Does my motor like it?

SMPS Power supply: MP 3800 I have a 12V brushed DC motor hooked up to a PWM controller. When I run the motor (all works as it should) however there is a lot of crackling noise coming from the PSU. ...
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3answers
138 views

How to run hair trimmer's motor normally (without pulsing) using 12V/1A charger? Its orignal cell battery uses 1.34V and 0.34A

I want to run a small DC motor (which is operated on a 1.2V 600 mAh cell battery) using 12V charger. Now the problem is that when I connect the motor to 12V, 5V, 3.3V the motor starts pulsing (I mean ...
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1answer
39 views

Confusion with RPM calculation of a DC fan from its datasheet

I want to calculate pulse periods from a tacho output of a DC fan. I want to read pulses by a MCU and convert them to RPM and display in LCD. But I'm confused with the following description of RPM ...
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1answer
54 views

Buzzer circuit understanding

I have a question concerning this circuit I have found on internet since I would like to replace it with a mini dc motor vibrator. Is there any chance someone could explain to me how it works? As ...
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2answers
89 views

DC Series motor and its starting

I studied electromagnetics and with that understanding when I recall the Working of DC Series motor I stumbled upon an inherent negative feedback action in the DC series motor during starting as ...