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96 Threads found on Braking
Hi All, I have an ac induction motor of about 0.5hp. I need to stop it by e-braking. I heared about e braking by DC voltage injection. Can you guide me by giving some explaination or links or schematics. Regards, Vamanan Kutty
Hi All, I am trying to store the energy from regenerative braking to the battery. will the battery store the energy immediately? Or battey will take some time to absorb energy? ( Since in the regenerative braking, less energy only be produced before stop) Do we need any capacitor to store the energy from motor and then to battery? Thanks in a
I am not able to read your diagram very well. To brake a universal motor, there are two ways, one is to inject low voltage DC into the motor*, the other is to put a low value resistor (or a short) across the motor. I think your is the first type. * typically 230V ac motor has 12V DC braking (same current or you burn out the windings). Frank
What does it mean by these terms : DC Reactor Connection, braking Resistor Connection & braking Unit Connection ? What is DC Reactor ? With what components its made up of ? What is braking Unit ? With what components its made up of ? What is braking Resistor ? With what components its made up of ? (...)
I guess you'd begin with determining the motor output voltage (RPM and constant) and the boost ratio to get 600V + delta (diode drop, series resistance, braking current) which with an assumption about converter operating mode (conduction) ought to get you a duty cycle from boost converter basic equations. Treat the motor as a voltage source and it
Hi i'm trying to implement regenerative braking on a simple PM dc motor controller i'm aplying a pwm signal to the mosfet to control the motor speed, but i can't figure out how to put the regen part working was hoping that when the M1 mosfet is off, that the motor current wou
I need a design for motoring & regenerative braking of DC motor that works in proteus ISIS 7 professional. I need the .DSN file or any images that helpful for me. Please help me anyone.........
I think you want to use the control loop and command a lower speed than rotor speed. You have to respect the battery's charging current limitations and you want some proportionality if this is a transportation application - who brakes by locking them up? If you can command negative torque, this is your best regen braking I think. But you do want
Hello dear friends, My project is about improving an AC motor drive's efficiency by implementing regenerative braking and i really need your kind help. Does anyone have a simulink model of a bidirectional DC-DC converter for connecting a storage battery (for charging and discharging) to the DC bus of a 3-phase PM motor drive that I could gain ac
Hi guys. I would like to seek assistance and advice on constructing a MATLAB simulink model to display the simulation result for regenrative system starting from the pedal brake, till the battery side to monitor any output. For your information, I'm currently doing a project about retrofit conversion of hybrid electrical vehicle (HEV), and my
Hi everyone. I want to study and design a dynamic braking unit. i have a braking unit of DELTA, Model number VFDB4045, 460V, 45KW. The circuit of this unit is not clear and may be i could find it helpful. if anyone can provide a circuit diagram, or operational step of each circuit blocks.
A high current capable boost converter is what you want. It will run differently than a normal fixed output, slightly variable input - you need a wide range of input from the full speed armature voltage, to as low a RPM's back EMF as you can manage, so that your braking recoups as much kinetic energy as possible. And your braking effort needs to b
Dear all, I am working on a simulation based project in which.. i have to show: AEB=Autonomous Emergency braking,,,, with a controlled slip ratio value of 0.2 And distance measuring system which measures the distance between host and target vehicle. I have to build this project simulation based only... and i want to build this on Simulink or
HI... I need to simulate an ABS (antilock braking system) in Matlab. But i don't know how i can do it?? IF any body can send me any Books (PDF) or sites learn me about Simulation ABS in Matlab, Or you Of course.... Thanks
If the motor connected to the VFD (inverter) is considered too big for normal braking (by the inverter), it may need a braking resistor or an active braking module. I mean that if the internal braking currents get too high the drive may automatically just let the motor to coast to stop in order to avoid burning its (...)
Of course I'm using a microcontroller ( steering and braking already implemented in PIC 16F84) . I'm searching for schematics for the transmitter and receiver for the analog part . I'm wandering if I can modify RC control for servos to DC motors. For this I've found some doc's. I only need schematics for trans. en receiver. Any suggestions?
I need a simple means of braking a dc 12v motor using solid state technology.
When you start moving your car, the ammount of energy required is enormous, there you will have the biggest energy peak consumed. Even if I did not built such a car, I think no solar panel is capable to do this. Personally I would not like to wait for a sunrise in order to start my journey... Energy must be stored somehow, and maybe the accumulator
If you want to brake the AC motor you need to inject a DC current into stator. This is as you fix a vecto in oune position and force the motor to follow this vector. The induced current on the rotor perform resistive losses on it then take in account that before another braking action you need to cool enugth the rotor. Bye.
Shorting the motor windings together provides dynamic braking and bring the motor to a fast halt
Hello atferrari, You can get some braking action by making a short circuit over motor terminals. This will introduce some "viscosity" that make a bit harder to move the motor, however this is not a real brake. A mechanical brake will introduce aditional power drain, unless you get something that you engage or disengage with a pulse. As you have
Hello i`m right now choosing suitable low cost IGBT with this characteristic 200A/600V/15kHz. Anyone can give me any suggestion?
I'm a beginner electronics user, actually going to school for Computer and Electronics Engineering Technology, but I just started. I've always enjoyed working with electronics, even with the limited knowledge I have. On my motorcycle I want to eliminate the rear fender. Only problem is, the rear turn signals are mounted to the rear fender. I can
I have managed to design a circuit with zero crossing detector+pulse transformer by using SCR to control the speed of my separately excited dc motor. It is single phase and half wave control. I wish to ask is there any modification i can do on my circuit? For example adding commutation and braking system. Please advise. If possible give me some
ESC - Electronic Speed Controller for DC Motors (with brushes) This ESC is using 4 FET's (= Full Bridge, No relays). It has regenerative braking to reduce battery power consumption and FET heating. The input signal is a traditional RC
Hi, Breaking the loop in simulating the stability is a work with great care,because loading effect should be avoided when braking the loop. Pls.see the attached file. It gives a method to avoid the loading effect. It is the technique 2 in page 3. I still have some questions on it. The loading effect involves keeping the input impedence and o
Is a hard to get the right answer, because the manufacturer specifies only the maximum continuous input power. If the duty cycle of the input signal is high, definitely the level of the signal could be higher before braking the temperature of the junction. But there is not only temperature that could damage the junction, is also the breakdown vo
I suggest that you use a H-Bridge for controlling your motor in all four quadrants ≡ forward,reverse,forward braking and reverse braking ≡ PWM will be applied to the switching of the transistors to control the speed. I havent used pic but I know that some variants of pic do have PWM outputs in them. I used the timers in 8051 to gene
My final year project is Intelligent Antilock braking partner and I decided to use an RC car for the order to make the system intelligent, a controller (Fuzzy Logic or Neural Network based) will take inputs of steering angle and slip value (calculated from the measured speeds of the body and wheel) to modulate the applied bra
Hi, Very strange braking solution !!! It's looks like battery's short-circuit. Be careful with this solution your accumulators can explose. CD:D
A conventional push-pull converter with a transformer should be always considered, particularly for unregulated design. Step-up converter would have higher current ripple at in- and output but minimum part count. A resonant converter (e. g. ZCS) would give lower switching losses. If bidirectional energy flow is intended (electrical braking), it
The original term "freewheeling" was related to device(s) that allowed power transmission shafts to rotate "freely" when its speed was greater than that of the engine to which it was connected. In fact in the cars of the 20's and 30's a selector switch was installed on the steering wheel column allowing the driver to select the mode of oper
I have to modify part of Verilog code for DC motor driving which is used for an Iris position control. The factory suggested PWM can?t be used. In my idea, I am going to use PID algorithm to generate the control pulse. The situation is as followings: The DC motor control voltage is fixed at 5V, H bridge is used and the position data
Hello everyone, I would be very grateful if I could have some advice regarding my project. My task is to connect the HV battery of a plug in series hybrid vehicle to the motor using the appropriate converter. I will need to boost the voltage from approximately 280V to 700V. This connection needs to be bidirectional because the motor is operatin
My aim is to apply brakes to a 1-Phase AC Induction Motor. Do i simply swap the motor terminals with the a DC source? or there are any better ideas for AC motor braking? Motor specs: 220VAC 0.25Hp 1phase Regards.
Hello I've seen that some 3 phase bridge topologies use three extra diodes in serires in the branch. This topology is shown in the image bellow. For a BLDC motor drive, will this topology help to handle back EMF? will this make a more robust brige? what other considerations should be taken, to implement this? Thanks in advance. Alex
Hello, The purpose of this resistor is disipate the energy recovered to the input filter capacitor during braking and avoid overvoltage. During braking cycle, the motor turns into a generator converting the cinetic energy to current, that find its way to the input capacitor usually trough the free wheeling diodes. If you have a high inertia load
that would mean that motor is braking in every cycleNo. PWM implies a voltage conversion utilizing the motor inductance.
Project is based on old Unitra Brd 12U calculator. Design is elegant and small. All is built at one - side boards without any jumpers Calculator built up of two boards - main and keyboard. At main board we have all electronics.
hi all..... I m building a 4 quadrant chopper using IGBT-H bridge for sep ext dc motor. motor specifications are 230v, 3.7 A, 0.75hp. Im trying to make a controller using uc 3638 pwm without any microcontroller. The problem i am facing is how to design the control circuit for reg braking ... i know the topology for regenerative braking b
Hello, Are you sure you want to use a SCR. This requires that the current becomes zero. Looking to your other requirements a H-bridge (4 switches) with a PWM drive, current measuring in the low side switches and EMC filtering is a better option. I don't know the voltage range, but up to several 100V you can buy fully integrated full bridg
Hi all, This is Emiliano and I'm new in the forum. I have a question: as far as you know, is it possible to extract a gerber file from a PCB? Is there any hardware/software able to recognize and draw the design of a PCB. An alternative solution would be expensive, such as using X-rays or braking it. Thank you, Emiliano
I don't have a braking system on the turbine. Is it not possible to have a constant current charging using a high value inductance in series with the battery? Can anyone please explain what methodology of charging will perfectly fit the given constraints?
I want drive the braking resistor of servo driver I will have 10 KHz PWM signal
Hello. I'm making an electric skateboard and will be using this motor controller: Kelly 24V 300A (peak) w/ the wiring schematics (page 10): [URL="www.kellyco
Hey everyone, I need some help here. I've so far writen the program as below and I've managed to get the hex file. I'm trying to download the program into a PIC18F452. FYI, I'm using a 40-pin enhanced start-up kit. When I try to download the file and click "start bootloader", the message " error :timeout waited for PIC" comes out. Any idea what I'
First- it is good to know that permittivity is not a constant. It depends upon frequency, among other things. Permittivity is a response of a non-conductive material (not exclusively) to electromagnetic field. It is important to define the "nano-scale" to know a reply to your question. In physical interpretation, permittivity may be expressed as
Hi, I perform an experiment in the lab and i want to calculate the inertia of the drive that i test. Below is the description of what i did and the results. Test System ? AC Variable Speed Drive ACS800, 5.5 kW, 415 V, 17.6 A, ?ABB? A2 ? DC Variable Speed Drive DCS800, 400 V, 25
hello, how PWM signals could be used within a vehicle break control system to deliver braking force to a wheel and how control system would convert the braking force into actual PWM control value and i would like improve by a ddition of closed-loop. thanks ..
It depends very much on the size of the camera. Are you thinking in terms of a small webcam or a heavy professional video camera? In general, use two stepper motors with reduction gears if necessary. Steppers have the advantage of staying locked in position, if you use normal motors you would also need a braking system so they don't roll by themse