is vfd suited to run slip ring motor

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Slip Ring Motor - Electric Motor Manufacturers and ,

Slip Ring Motor - Electric Motor Manufacturers and ,

018-4 kw 025-55 hp aluminum frame capacitor start capacitor run single phase induction motors , 220~2500 kw high power asynchronous slip ring motor 075kw - 45kw 1hp - 60hp electric brake motors , High Power Asynchronous Slip Ring Induction Motor Output : 220 up to 2,500 kW Voltage : 380 up to 13,800 V

Slip Ring/VFD - AutomationDirect Customer Forum

Slip Ring/VFD - AutomationDirect Customer Forum

Nov 13, 2007· I have ran equipment with VFD drives supplying 460v 3PH motors through slip rings for years If you set up a new project, make sure that the slip rings are rated for AC voltage and higher voltage as the case may be

Starting Large AC Motors - IEEE Entity Web Hosting

Starting Large AC Motors - IEEE Entity Web Hosting

o maximum 5% slip o high to medium starting current , o suited for a broad variety of applications -as fans and pumps , Starting Large AC Motors For IEEE Houston Section –CEDSeminar By: Roy Cosse, PE Robert Spiewak, PE Presentation Code: 214 March 22-23, 2016 start

VFD Benefits - L&S Electric

VFD Benefits - L&S Electric

VFD Benefits As one of the main advantages of using a VFD is the energy cost savings associated with speed control When using belts, sheaves, or gearboxes to reduce speed, the motor still runs at full speed; however, a VFD reduces the actual motor speed, which reduces the amps drawn by the motor

Using Inverter with exsiting slip-ring motor for overhead ,

Using Inverter with exsiting slip-ring motor for overhead ,

Nov 28, 2008· Hello: In our steel making plant factory, there is an electric overhead crane with 120 ton hoist driven by 220KW slip-ring motor The motor is started using 4 steps of rotor resistors, and speed is controlled via SCR circuit

Can a VFD drive a slip ring motor? - szpowerdrive

Can a VFD drive a slip ring motor? - szpowerdrive

A slip ring motor is normally not designed for the extreme high du/dt values stressing the winding insulation at VFD drive (fast switching) There is a high risk that partial discharge will break down the winding isolation material causing flash-over if it is not designed for VFD

What is the working principle of slip ring induction motor ,

What is the working principle of slip ring induction motor ,

This means that the motor can be run at high slip (slowly) without overheating the rotor windings However starting and speed control applications of slip ring motors has largely been superseded by VFD control of squirrel cage motors Slip ring motors are now quite rare and expensive to obtain

Wound rotor motor - Wikipedia

Wound rotor motor - Wikipedia

A wound-rotor motor is a type of induction motor where the rotor windings are connected through slip rings to external resistance Adjusting the resistance allows control of the speed/torque characteristic of the motor

Wound Rotor Induction Motors | AC Motors | Electronics ,

Wound Rotor Induction Motors | AC Motors | Electronics ,

A wound rotor induction motor has a stator like the squirrel cage induction motor, but a rotor with insulated windings brought out via slip rings and brush However, no power is applied to the slip rings Their sole purpose is to allow resistance to be placed in series with the rotor windings while starting

Replacement of Slip Ring Motor With 'Squirrel Cage Motor ,

Replacement of Slip Ring Motor With 'Squirrel Cage Motor ,

Nov 05, 2011· Re: Replacement of Slip Ring Motor With 'Squirrel Cage Motor & VFD' 11/05/2011 4:05 AM Convert the existing slip ring motor to induction motor by shorting the sliprings

IEEE SF Motor Protection Fundamentals

IEEE SF Motor Protection Fundamentals

Motor Protection Fundamentals Ali Kazemi, PE Regional Technical Manager Schweitzer Engineering Laboratories , Slip-Dependent Motor Impedance: Steinmetz Model 5/29/2015 , effective motor protection • Running stage, starting stage, and locked-

Use of variable frequency drives with wound rotor motors ,

Use of variable frequency drives with wound rotor motors ,

The slip ring or wound rotor induction motor (WRIM) has been used in a variety of applications Many of these applications use the WRIM's high starting torque capability while limiting current to start and run very high inertia loads such as hammer mills, rolling mills, centrifuges, and rotary kilns

Why sliprings are provided in an induction motor? - Quora

Why sliprings are provided in an induction motor? - Quora

Slip-rings are provided in three phase slip-ring induction motor to insert the external resistance in the rotor circuit of the motor At start whole of rheostat resistance is inserted in the rotor circuit and the rotor current is reduced correspondingly it reduces the current drawn by the motor at start

Hypothetical: What happens if you run a 460V inverter-duty ,

Hypothetical: What happens if you run a 460V inverter-duty ,

Sep 01, 2015· IF you have 230V available, and you put it into a VFD, AND you properly program the VFD to put out 230V at 30Hz, then the V/Hz ratio is 767 V/Hz and the motor runs fine, just 1/2 speed Any inverter duty motor should be capable of doing this all day long

In VFDs, could motor current parameter be set higher than ,

In VFDs, could motor current parameter be set higher than ,

The most undesirable side effect to connecting a motor to a VFD that has a higher rating without setting the motor current rating to correspond to the actual rating of the motor is that the VFD will not be able to provide overload protection to the motor

What are slip rings and why do some motors use them?

What are slip rings and why do some motors use them?

The slip rings are only used at start-up, however, due to their lower efficiency and drop-off of torque at full running speed As the motor reaches its operating speed, the slip rings are shorted out and the brushes lose contact, so the motor then acts like a standard AC induction (aka “squirrel cage”) motor

08 AC Motor - Schneider Electric

08 AC Motor - Schneider Electric

brushes and slip rings to the motor field windings The field exciter for a brushless synchronous motor typically , rated output power of the motor at the motor shaft when the motor is running at full speed Due to losses in the motor, the input power will be higher Due to the motor power factor and these losses, the full-load current of the

AC Motors, Controllers, and Variable Frequency Drives

AC Motors, Controllers, and Variable Frequency Drives

Typically, a Variable Frequency Drive system involves an AC motor, controller, and operator interface The three-phase induction motor is most commonly applied to a Variable Frequency Drive because it offers versatility and cost-effectiveness in comparison to a single-phase or synchronous motor

CR4 - Thread: Slip Ring Induction Motor- VFD Starting

CR4 - Thread: Slip Ring Induction Motor- VFD Starting

Jul 09, 2013· Re: Slip Ring Induction Motor- VFD Starting 07/05/2013 11:56 AM If your motor is an inverter duty it can withstand the new challenges presented by a vfd, but if it is not, it may fail both electrical and mechanical in nature

Squirrel Cage Induction Motor vs Slip Ring Induction Motor

Squirrel Cage Induction Motor vs Slip Ring Induction Motor

Squirrel Cage Induction Motor vs Slip Ring Induction Motor by ADMIN Published June 16, 2015 Updated January 1, 2018 Comparison of Squirrel cage induction motor with slip ring induction motor (Wound Rotor Induction Motor) is listed in the below table:

Starting of slip ring induction motor explained in an easy ,

Starting of slip ring induction motor explained in an easy ,

The slip ring induction motor has two distinctly separate parts, one is the stator and other is the rotor The stator circuit is rated as same in the squirrel cage motor, but the rotor is rated in frame voltage or short circuit current

Whether vfd is suitable for slip ring motors - Answers

Whether vfd is suitable for slip ring motors - Answers

400hp slipring motor has been short circuited and connected to the 315kw variable frequency drive The vfd has run continuously for 2 days without any problemAfter a supply break the vfd couldnot .

Replacing slipring with induction motor - Electrician Talk ,

Replacing slipring with induction motor - Electrician Talk ,

Sep 24, 2014· i am running a Ball Mill using a 750HP , 4 pole ,slip ring motor at 33KV i want to upgrade the system to a squirrel cage motor and VSD at 525Vac

slip ring motors and vfd's - Variable Speed Drives - LMPForum

slip ring motors and vfd's - Variable Speed Drives - LMPForum

Hello charles ray Welcome to the forums Yes, a slip ring motor can be used with a vfd, and because when under VFD control, the slip ring motor will never be operated under high slip, you just short out the rotor circuit ie dispose of the secondary starter circuit completely

Starting torque of slip ring motor and induction motor ,

Starting torque of slip ring motor and induction motor ,

Short out the slip rings and the motor will run just like a standard induction motor The next thing to worry about is the load Slip ring motors are normally used where additional torque is required to overcome the inertia of the load

VFD application on existing motors | Processing Magazine

VFD application on existing motors | Processing Magazine

When a variable frequency drive (VFD) is added to an existing system, many potential problems may arise This article details some of the factors to consider when installing a medium-voltage (MV) VFD on an existing MV motor in order to ensure safe and efficient operations

Difference between Slip Ring Motor with Conventional Drive ,

Difference between Slip Ring Motor with Conventional Drive ,

A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical , A Advantages of Slip Ring Motor: Suited for high inertia loads as it accelerates with excellent starting torque Low starting current when

Is it possible to polish the slip ring while the generator ,

Is it possible to polish the slip ring while the generator ,

Absolutely can not do that, This can easily lead to personal and equipment hazards The correct way is to power off, with the hand drive shaft, while grinding with fine sandpaper contact slip ring

Switching it up: IGBTs - VFD, Inverters, & AC Drives

Switching it up: IGBTs - VFD, Inverters, & AC Drives

If a slip ring rotor resistance regulation method is used, s still increases and loss increases, but the Moment Mmax is constant but moved lower in rpm If a frequency based speed regulation method (VFD) is used, the ns is altered so s (the slip) can be held much lower

Motor Control for 3 Phase Induction Motors - Education

Motor Control for 3 Phase Induction Motors - Education

They are truly elegant machines in that there are no moving parts except the rotor, and there are no brushes, commutators, or slip rings to wear out This computer program explains How To Control 3 Phase Induction Motors in easy to understand text, graphics, and pictur

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