Questions tagged [braking]

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2answers
221 views

How to electrically brake a brushless motor

I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors. I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
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0answers
24 views

Problem calculating winding temperature in a brushed DC motor

I'm building a rig for measuring pull out torque for stepper motors, and am looking at dynamic braking and plugging of a permanent magnet DC motor which will be used to apply a variable braking torque....
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1answer
47 views

Braking a small hall sensor BLDC motor on a ballscrew

I want to create a simple circuit (or better, add software change for the existing circuit) for deceleration of a small BLDC motor connected to a ball screw. Exact stopping at zero is not a ...
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1answer
45 views

Universal Motor as a magnetic brake

Hello friends of stackexchange, I want to make a magnetic brake based on a universal motor from a Candy wash machine TYPE 20584.528. I suppose that the best way is to use the motor as a DC generator ...
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2answers
115 views

BLDC/BLAC controller motor voltage reverse protection

I am currently designing a BLDC controller and keep running into a power safety issue: I have added a smart diode reverse protection controller to my design with its transistor between the fuse and ...
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1answer
73 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
35 views

I have a 2 phase ac motor I need to use as a constant speed brake, how do I modify my circuit to make this happen?

Please see the circuit below. I have a 2 phase AC motor 120v, 50hz, 250w, I need to use this to enforce a constant velocity against an accelerating force, or in other words the motor rotates ...
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4answers
3k views

Is a PWM required for regenerative braking on a DC Motor?

The DC Motor is question is here: DC Motor I was wondering if you use a diode and a switch in a manner shown in the below picture if the motor would exhibit regenerative braking when SW1 is open? (...
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3answers
992 views

Braking Methods of Induction Motor in VFD

As you know, we can stop an induction motor by plugging or regenerative braking. What I'd like to know is that when controlling induction motor with VFD, which braking way VFD uses? It seems to me ...
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1answer
149 views

How does DC braking stop an AC motor without considering current direction?

When a motor is coasting to standstill, if I apply a DC voltage across the windings I will brake that motor... We'll at least that's what I've read. Now here's the thing. With reverse current ...
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0answers
92 views

Simple braking chopper using Zener/TVS diode

So I'm designing a motor controller, relatively low power (100-150W, 12-48V supply), and I'm thinking about adding a braking chopper. Not strictly needed in this design, but it would be a nice value-...
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1answer
82 views

Braking Methods in Induction Motor

When I search on web, I see three types of electrical braking exist for induction motors. 1-Regenerative 2-Dynamic 3-Plugging Regenerative is said to be possible when rotor speed is higher than ...
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2answers
95 views

My hybrid motor starter keeps tripping

I have this exact motor starter on my AC braking motor (FLA 3.5A). The starting current is 12.1 A however and keeps tripping the relay after approximately ten minutes of use. The motor operates by ...
3
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2answers
257 views

Brake Resistor in Regenerative Case for Elevator

I am trying to understand the switching pattern of Inverter and the Brake chopper while a 3-phase AC motor is in regenerative mode for example in Elevator case: When its Cabin is full and it is ...
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3answers
291 views

bldc regenerative braking, braking torque

I'm trying to figure out the braking torque calculation for a BLDC simulation. Now if I'm looking at a datasheet I know the torque at a given rpm at acceleration. If I brake with regenerative breaking ...
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2answers
356 views

Determining the correct power rating of a braking resistor

Braking resistor on AC servo motor driver is not working, and I cannot find power on it, but it is 100 Ohm (It burned up). Power on driver is 200W. Can I put 400W (100 Ohm) braking resistor on that ...
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1answer
59 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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0answers
69 views

Half Bridge motor braking

I have a motor that only runs in one direction. I currently use a fqp30n06L logic level MOSFET to control the motor. Once the MOSFET gate is grounded, the motor does stop but it freewheels. I also ...
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4answers
132 views

Is it possible to switch an electrical machine several times from motor to generator and vice-versa, within one revolution of its rotor?

I would like to find out how quickly and frequently a reversible electrical machine (EM) can be made to switch functions from a motor to generator and vice-versa - and what are the parameters of the ...
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2answers
395 views

Slip ring (wound rotor) 3 phase motor, what VFD should I use? [closed]

I'm trying to solve some puzzles around the electronics of an amusement ride. It's basicly an old carousel with a wave-like pattern (3 tops/downs along the circle) that i'm restoring. (So that you ...
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1answer
722 views

How to calculate size of dynamic braking resistor

I'm running an RC car which has two zytd520 12V 150rpm dc motors run through an L298N motor controller. I'm going to use reverse current braking to save on weight and complexity of mechanical parts. I'...
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6answers
2k views

Regenerative braking on an electric bicycle

I'm currently trying to build myself an electric bicycle with a regenerative braking system. I am however stuck on the regenerative breaking part. The bike will include a simple DC motor, powered by ...
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0answers
800 views

How can i brake/stop a stepper motor vertically

I have a stepper motor mounted vertically on a rail (rack). That can rise and fall vertically and stop on certain position in height on this rail. My problem is that when my stepper motor stops, it ...
1
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1answer
2k views

How to implement a motor brake

I have a chinese dc motor controller (YK31C, 350W) which has a connector for the brake. This connector will only interrupt the PWM Signal from the controller and does not short the motor for braking. ...
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2answers
153 views

Regenerative magnetic braking system [closed]

I have to work on a magnetic regenerative braking system, I already designed the magnetic brake and it works, now I need to regen the braking force (Lorentz force). What kind of motor and circuit ...
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3answers
637 views

Why does shorting/putting heavy load on a motor slow it/stop it?

I am doing a simple circuit which includes using a motor in theory (I am using a stepper-motor) as a break. One of the random fun-facts that I have known for a long time is how shorting a stepper ...
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1answer
81 views

Electrical Braking: Why does voltage decrease with a decreased rheostatic load?

So I've been messing around with DC motors and electrical braking. BY placing a variable resistor across the motor terminals of the motor I've been able to vary the braking effect and observe the ...
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3answers
3k views

Braking a small, high-speed DC motor

I am currently having an issue with precision control of small brushed DC gearmotors (130 size) being used as drive motors on an autonomous robot, but this question can be applied to small, high-speed ...
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1answer
171 views

eddy current brakes

I am trying to make an eddy brake prototype It works perfectly using a permanent magnet, but I have to make it using an electromagnet which is not working. I am using a solenoid purchased from Amazon ...
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3answers
3k views

Effect of 0 Hz setting on VFD with continuously spinning fan

As part of a HVAC system we have a supply fan and extract fan running on independent VFD1. With the current configuration we usually don't need to run the return fan as the supply fan pressurises the ...