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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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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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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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 ...
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12v DC motor controller to 12v wiper motor

]3i have a pretty straight forward question, i think anyway. So im trying to power a 12dcv 20amp wiper motor with a 9-60v 20amp dc motor controller but the problem is its not changing speeds with the ...
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42 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
40 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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80 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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103 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 ...
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27 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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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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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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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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36 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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51 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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81 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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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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121 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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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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41 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
76 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 ...
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33 views

Field Flux control and Speed Of DC motor

I was studying electromagnetism and I tried to link with working of DC motors. For the speed control of DC motor - The Flux of DC motor is reduced to increase the speed above rated speed. I ...
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52 views

If I used an everyday 9v alkaline battery to power a 6v DC motor, would it work? [duplicate]

I am totally new to electronics and don't know much but am trying to create a project that uses a 29rpm 6v DC motor. I was wondering if I were to use a higher voltage battery ( a 9v battery) would it ...
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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 / ...
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165 views

Would a 9V alkaline power a 12V DC motor?

I am thinking about buying a 12V DC motor but want to keep everything, including the motor, battery, and power switch somewhat compact. I am not very knowledgeable about these kind of things and am ...
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81 views

NE555 power controller not working with big motors

simulate this circuit – Schematic created using CircuitLab Backstory: Ok, so I thought that a making a PWM controller would be a fun weekend project, it's been a week now and I still can't ...
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109 views

Problems with dc motor driver design: Mosfet fail

I made a brushed dc motor driver. The motor speed is controlled with PWM (from an Arduino). The motor that I'm using draws 3 amps without load. This is the schematic: As you can see there are two N ...
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4answers
62 views

Solutions to reduce start-up currents from multiple DC motors

I have some DC motors (8) which are connected to the same power supply (Murata, 12V, 20A), each motor needs 1A and is driven with a MOSFET. When I start these motors at the same time (a need for my ...
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78 views

Maxwell Equations for modeling a DC Motor

I have seen so many videos about this and none helped me. I can't calculate B. (equation:\$ E = 2*N*area*B*cos(\theta))\$. I mean... when I calculate the field B, I find high values for the current. ...
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54 views

Is it possible to 'upgrade' a 5V-RC-servo for higher voltages? [closed]

I built a robot using these servos. Since the robot is quite heavy, the motors need more current than my power supply is capable to deliver (around 3.5A peak). One solution would be to upgrade the ...
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34 views

STM32F0, DRV8840 and GPIO Problems

Today I tested a DC driver with a STM32 MCU. The schematic is like this: I have a problem with the ENABLE Signal between the DRV8840 and the MCU. When the DC Motor is disconnected, I toggle the EN ...
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Brushless DC motor steady-state performance modeling

For a brushed DC motor, there are the well-known differential equations describing the electrical and mechanical behaviour: \$V_a-i_aR_a-L_a\frac{d}{dt}i_a-k_e\omega_a=0\$ \$k_ti_a-J\frac{d}{dt}\...
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70 views

Synchronising two DC motors

I would like to synch two small DC motors so they run at the same rpm but in opposite directions. Is there a straightforward (and light) way to do this from a single battery pack? My goal is to turn a ...
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Can I control 6-7 devices of 12v max (each) with Arduino Uno?

I have to control following devices: 2 × Gear motors (each 12V, 200mA, speed & direction) 1 × Motor (12V , 1.2 A, on / off) 1 × Motor (3V, 110mA, on / off) 1 × dc pump (...
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742 views

If a high rpm motor is run at lower rpm, will it produce more torque?

I did the following calculations: Max current = 1.2A, Max voltage = 12V Then power = 14.4 watts = 0.019hp Rpm = HP * 5252 ÷ torque I need a torque to 2kgf-cm = 0.144 lb-ft Gives rpm= 698. Thus this ...
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Do H-bridge configurations have any advantages over single MOSFET dc motor speed controller designs?

I’m designing a simple dc motor speed controller that only needs to be driven in one direction and I’m wondering if an H-bridge configuration would have any advantages over a single or dual MOSFET ...
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How do I work out spec of 24v dc motor?

I have a motor in a vending machine (picture) it only has these numbers on. What I'm hoping to do is turn the motor on and off. However I have no idea what this motor is aside from 24v dc. How do I ...
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TB6612FNG DC Motor Driver Low Current Problem

I have a TB6612FNG pololu DC motor Driver (datasheet), and pololu 488:1 6V DC motor (motorPage). It is clearly stated that motor has 2.9A stall current at 6V and driver has 1.2 continuous current and ...
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66 views

24v dc High current variable speed Voltage regulator

I’m in need off a high current voltage regulator. I know a little about electronics, but not on an engineering level of designing stuff. I have a few stuff on scrap boards that I can use that lying ...
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698 views

What does the output current rating from an H-Bridge's datasheet really mean?

I bought the H-Bridge VNH7070BAS from ST because it would drive up to 15A, but when I test it, it only reaches 6A and then it shuts down. What does that value really mean? How can I get the output ...
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72 views

Can you connect transistors directly to high voltages or is there precautions neccesary?

I understand that the circuit above will simply work, but what if the voltage input from the battery is significantly higher and the necessary voltage for the motor is high as well? Can you still ...
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What's the easiest way to implement portable current measurement for a ~200W dc motor?

I'm tinkering with an electronic skateboard build and I'm looking for a way to do some current measurements "on-the-go". What's the easiest way to implement this? It wouldn't be a part of the final ...
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Circuit Analysis Involving DC Motors

When it comes to simple circuit analysis, there is millions of tutorials on how to analyze a resistor circuit, a RC circuit, or those involving LED the non-ohmic devices. However, I did not find a ...
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56 views

Multiple devices on 1 battery

My current project is a green lantern minigun prop. I 3d printed it already, im just working on the electrical end of things. I have a 12v drill motor that im using to spin the barrels. also in that ...
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L293E, voltage difference exists between output 1 and output 4, yet it can't drive a small motor

I'm using L293E to drive one motor in two direction. Output 1 and output 4 are connected to the motor and I alternate Input 1 (1A) and Input 4 (4A) between VCC and GND. (never input1 == input4). Vs ...
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54 views

Creating higher voltage from DC motor?

Is it possible to take a regular dc motor, use it to spin some strong magnets over some coils, and get a higher voltage than what's being used to drive the motor? I was thinking; if you're able to ...
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69 views

Battery is 12 volt and motor is 3.7 volt…will it work?

I have a battery that says it has a working current of 4.6A and rated voltage of DC 12V I need the battery to power a motor for a fan that says it has a voltage of DC 3.7V Will it work? What will ...
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How do I suppress this voltage spike/dip?

I have a system that's currently testing automotive brushed dc motors. Occasionally, I'm getting interruptions in my data acquisition system that I believe is being caused by transients coming from ...
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1answer
53 views

What is the state space model for a BLDC motor

I wanted to model a brushless DC motor so that I can add controllers(PID ) to correct the transient state behaviors. I started to model my BLDC and I found some model. Then I used specs from MAXON ...
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1answer
44 views

Small Vacuum pump driving circuit

Please take this vacuum pump datasheet for the circuit I am planing to build. Vacuum pump datasheet I like to make a simple motor driver preferably using an SMD type MOSFET. I am struggling to ...
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1answer
48 views

what is cut off current in dc motor?

This question is conceptual question. May it is easy for engineers to explain cut off current in DC Motor. In our formula, we are finding motor torque, $$T_{motor} = C_{motor} \times (I_{cut} - I_{...