can we replace any slip ring motor with an induction motor ,, Apr 22, 2012· A VFD can be used with effectively any AC motor Slip-ring motors with resistor starter have been a standard solution to achieve a kind of soft start, when either reduction of start motor current or torque is required, used for 50 years or so You have most likely difficulties to get a slip-ring motor replaced when it can't be no longer reworkedDirect drive PM motor system, An induction motor (sq - cage) driven by VVVF/ VFD system is ideal replacement for slip-ring induction motor However, the torque requirement / duty cycle of the crusher motor at various stages is important and the VVVF /VFD ,China High Voltage Motor manufacturer, Slip Ring Motor ,, High Voltage Motor, Slip Ring Motor, Electric Motor manufacturer / supplier in China, offering Asynchronous Three Phase Electric High Voltage Motor for Cement Plant, 8000kw Synchronous Motor Generator 40 Pole Motor, VFD Drive Ypkk Frequency Conversion Motor Speed Adjustable 350kw VFD Motor and so onvfd on slip ring "wound rotor" motors, Feb 07, 2008· vfd on slip ring "wound rotor" motors - posted in Variable Speed Drives: I am involved in converting a ball mill , which requires a large amount of starting torque, from a slip ring motor driven application to a vfd driven appl We have sent the motor to our motor guy to refurbish and interconnect the rotor windingsIs there any advice or similar applications out there that could be helpful ,Could we change Slip, An induction motor (sq - cage) driven by VVVF/ VFD system is ideal replacement for slip-ring induction motor However, the torque requirement / duty cycle of the crusher motor at various stages is important and the VVVF /VFD drive should be able to control the torque / ,.
My report vfd, Apr 22, 2014· The stator windings of the AC motor are connected directly to the grid, but the rotor windings are connected to the grid via slip rings and a frequency converter The Kramer cascade provides sub-synchronous region speed control principles where the slip ,AEGIS Shaft Grounding Rings | Electro Static Technology, AEGIS Shaft Grounding Rings protect motor bearings from the destructive shaft voltages produced by variable frequency drives (VFDs) This video compares the shaft voltage of a VFD-run pump motor before and after installation of an AEGIS ring (To see this video in several other languages, see this Youtube playlist)Slip ring Induction Motor, How it works ?, Induction motors have been ruling the industrial world for many decad In the induction motors used in lift and hoists, you will see a type of rotor called,Applying VFDs to existing motors | Processing Magazine, Typical slip rings in a motor View Image Gallery 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 operationsStarting of slip ring induction motor explained in an easy ,, For load sharing to take place automatically, the motor speed should drop considerably as the load increases and this is ensured by using a motor having a high full-load slip, say for example 10% Characteristics Of Slip Ring Induction Motor The slip ring induction motor ,.
Sizing VFD for Slip Ring Motor, Dec 22, 2015· If converting a slip ring motor to VFD, you would first need to short the rotor bars, and this would best be done so that the brushes are made redundant, otherwise they will still need to be maintained You would also want to be a bit careful of the condition of the motor as VFDs can impose pretty harsh voltage spikes on an old motor's ,Why Slip ring Induction motor is preferred for High ,, Why Slip ring Induction motor is preferred for High starting Torque application: Coming to practical world, many industries operate with slip ring induction motor for high starting torque application Example chopper, fiberizer, grinder etc where are the high torque application is required we prepare slip ring induction motor only In this tutorial we are going ,Transient Analysis of Three, achieved by adding external resistance to the rotor circuit through slip-rings Normally a face-plate type starter is used, and as the resistance is gradually reduced, the motor characteristics at each stage changes from the other (John 2010) Hence, the three phase wound rotor (slip ring) induction motor ,Rubber Mill Slip Ring Motor Experience ? [Text], I have seen many wound rotor motors with the slip rings shorted and run on a VFD Make sure the VFD carrier frequency is set to its lowest value, usually 2k or 25k You best method of shorting the rotor AKA slip rings, is in the motor junction box You also DO NOT need to over size the drive If you have a 20 hp motor, use a 20 hp driveRubber Mill Slip Ring Motor Experience ? [Text], I have seen many wound rotor motors with the slip rings shorted and run on a VFD Make sure the VFD carrier frequency is set to its lowest value, usually 2k or 25k You best method of shorting the rotor AKA slip rings, is in the motor junction box You also DO NOT need to over size the drive If you have a 20 hp motor,.
Using VFD with slip, Nov 21, 2002· One thing to remember when putting VFD's onto slip ring motors is that modern VFD's using IGBT's produce a very fast rate of change in voltage Slip ring motors tend to be older and their insulation system may not be up to the voltage stress that the VFD will subject them too You may need a VFD with a dV/dt output filter ie incressed costCan a slip ring motor run through a variable frequency drive?, Oct 25, 2016· The slip-ring motor has slightly different impedance response to a squirrel cage machine so the VFD control has to allow for this, but I believe most large VFD suppliers have this as standard The slip-rings need to be short-circuited so the ,Can a VFD drive a slip ring motor?, 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 VFDvfd on slip ring "wound rotor" motors, Feb 07, 2008· vfd on slip ring "wound rotor" motors - posted in Variable Speed Drives: I am involved in converting a ball mill , which requires a large amount of starting torque, from a slip ring motor driven application to a vfd driven appl We have sent the motor to our motor ,change Wound rotor motor to VFD fed induction motor ,, Jun 01, 2008· There are existing 1600HP wound rotor motors driving centrifugal pumps at a water pumping station There is a push to convert the motor to a VFD driven induction motor The VFD cost is high The thought is that reliability would be improved Also maintenance on the slip rings ,.
The concept of using AC Drive with Slip ring motor ,, May 19, 2008· This isn't the best practice because the motors insulation classification is probably not up to standards for VFD's in the long run you would be better off getting a Drive rated motor As for vfd's they convert the incoming 3 phase AC to DC then thru pulse width modulation they change the dc cycle then it gets changed back to an AC ,Slip ring (wound rotor) 3 phase motor, what VFD should I use?, However the motor is wound for 380 V and you are only using 220 V, so that will help My guess is that a dv/dt filter is not necessary 4) I got told that I would need a 2,2kW VFD due to that it is a slip ring motor, is this true? You should select the VFD based on the motor nameplate current You may need extra current for high starting ,Change synchronous motor to induction motor, Converting a synchronous motor to an induction motor is easily done, to most motors, by shorting the rings, however, you would most likely need to use a properly sized VFD to get the starting torque you need If you are interested to do such an upgrade you should consider the age of the motor and any other peripherals (gearbox, etc) in the drive trainVariable Frequency Drive Protection Functions on Motor ,, VFD can monitor the output voltage, and when the output phase is loss, the variable frequency drive will alarm and shut it down after a period of time to protect the motor Reverse-phase protection VFD can make the motor rotates only in one direction and unable to be set unless the user changes the phase sequence of the motors A, B, and C ,Various Uses of The Slip Ring Induction Motor, Other than that, the induction motor slip ring can be trusted for a various number of machines which include conveyors, cranes, compresses, elevators, large ventilating fans, hoists, and pumps An Induction motor generally requires a low starting torque in comparison to the dc series motor There is a great advantage of using a slip ring ,.
Starting torque of slip ring motor and induction motor ,, Dec 19, 2016· Old motors don't like this as if the insulation is not rated for a VFD, particularly if it is an old motor Also if you change a 22kW Slip ring motor for a 22kW induction motor it will not work as the starting (breakout torque) may not be sufficient To ensure our crane had the required breakout torque, we went to a 45kW motorA Review of Variable Speed Drive Technology: Part 1 ,, Wound rotor (also called slip ring) motors are based on inserting external resistances into the induction motor rotor circuit for induction motor torque controls Prior to the advent of variable frequency drives (VFDs), there was no other way for an induction motor ,Slip ring motor conversion to VSD driven standard squirrel ,, Slip ring motors can have many different ratings depending on the duty cycle for which they are specified If the standard squirrel cage motor is selected purely on nominal power, for example a 37 kW to replace a 37 kW slip ring motor, then the starting torque may not be sufficient Alternatively, if one is overly Slip ring motor conversion toA Review of Variable Speed Drive Technology: Part 1 ,, Wound rotor (also called slip ring) motors are based on inserting external resistances into the induction motor rotor circuit for induction motor torque controls Prior to the advent of variable frequency drives (VFDs), there was no other way for an induction motor to develop high overload torques (200 to 280 percent) over a wide speed range as ,Wound rotor motor, A wound-rotor motor, also known as slip ring-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 motors can be started with low inrush current, by inserting high resistance into the rotor circuit; as the motor accelerates ,.