19-01-2009 0183 32 I am trying to put together a proposal for updating some machinery at the plant I work for One of our machines has four each 5, 3, and 2 Hp 240 VDC electric motors running through a slip-ring This is the original design of the machine although we have replaced the original slip-ring The 5....

08-02-2017 0183 32 For existing synchronous motors to operate with a VFD, the synchronous motor must have its directcurrent DC field available at zero speed in order to develop starting and accelerating torque Two types of synchronous motor field exciter designs are suitable for starting and operating on a VFD DC slip rings or an alternating-current AC , brushless-type exciter...

Sizing VFD for Slip Ring Motor - CR4 Discussion Thread 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...

01-02-2020 0183 32 45/5 54 Views 22 Votes It is doable to set up a VFD to work with the 2 speed motor and switch motor connections and VFD settings using a rotary switch The problem has been that for some reason, the 2 speed motors do not ,...

22-11-2019 0183 32 Variable frequency drives VFDs are mechanical drive systems used to control alternating current AC motor speed and torque by varying motor input frequency and voltage VFDs are commonly referred to as adjustable speed drives, adjustable frequency drives, AC drives, microdrives and inverters A typical VFD has six diodes to direct the flow of electric ,...

11 As an energy efficient application, slip power recovery system fits well for ____ a Squirrel cage and slip ring motors b DC motor c Slip ring motors only d None of the above 12 Energy efficient transformer core is made up of _____ a ,...

Your VFD can achieve the purposes of a slip ring and resistance starting, so I would shot out the wound rotor at the slip rings and run the motor as a normal induction motor, that way I eliminate unnecessary points of potential breakdown We all know the problems associated with resistance starting, a VFD will eliminate all that...

05-10-2016 0183 32 Your VFD can achieve the purposes of a slip ring and resistance starting, so I would shot out the wound rotor at the slip rings and run the motor as a normal induction motor, that way I eliminate unnecessary points of potential breakdown We all know the problems associated with resistance starting, a VFD will eliminate all that...

converting slip ring motor to vfd royalcrescentgroup Slip ring wound rotor 3 phase motor, what VFD should 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 current re 6 Get Price...

20-02-2019 0183 32 To achieve true variable speed control of a centrifugal pump, this article will look at the following methods or technologies fluid drive, eddy current drive, wound rotor motor, adjustable voltage direct current DC , adjustable frequency alternating current AC , magnetic drive and steam turbine Part 1 of this article will focus on fluid drive, eddy current drive and ,...

07-01-2010 0183 32 Take that figure and divide by 60 That gives me of RPMs per Hz Multiply it by the HZ to get RPM for example 1725 RPM motor / 60 = 2875 2875 90 hz = 2587 RPM Now if your intent is to display motor RPM instead of HZ, then that is dependent on the VFD maker 12-07-2009, 08 22 AM 6...

Slip ring induction motor is one of the types of 3-phase induction motor and is a wound rotor motor type Because of various advantages like low initial current, high starting torque, and improved power factor, it is used in applications that require high torque, cranes, and elevators The rotor windings consist of more number of windings ....

converting slip ring motor to vfd Slip ring motor conversion to VSD driven standard 2016-3-29 Slip ring motor conversion to VSD driven standard squirrel cage ac motor By J van Niekerk, Zest WEG Group Over a number of years slip ring motors have largely been replaced by standard squirrel cage ac induction motors, often in conjunction with ac Variable Speed ,...

07-05-2008 0183 32 Converting a generator to a motor Hey Folks, I m new here to the forum and new to electric vehicl I am planning to build or do a conversion in the near future and am now in the learning and research phase I have access to a marine generator, its a 75KW slip ring unit built back in the late sixtys I was thinking of trying to convert it ....

03-08-2017 0183 32 vfd on slip ring wound rotor motors Variable Speed Feb 07, 2008vfd 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 Get Price Bangladeshi M/S ARAMIT CEMENT LIMITED ....

19-02-2021 0183 32 If using a wound rotor induction motor with a VFD, you would just need to short the outputs of the slip rings, ie turn it into a normal squirrel cage induction motor and control the RPM with the VFD instead of variable resistors across the rings...

25-10-2016 0183 32 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 brushes can be removed allowing maintenance-free operation but this is never really a difficult procedure...

21-11-2002 0183 32 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 cost...

21-05-2017 0183 32 May 20, 2017 4 Not really the way a VFD generates its output phase interleaved PWM it highly dependant on it being sent to a three phase motor with interconnected wiring and magnetic fields on one motor core That, and common single phase induction motors large enough to work with a VFD are not speed controllable to any significant degree ....

Can a slip ring motor run through a variable frequency , Know More 25-10-2016 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 brushes can be removed allowing maintenance-free ,...

07-02-2008 0183 32 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 ....

Slip Ring or Wound Rotor Motors The slip ring or wound rotor motor is an induction machine where the rotor comprises a set of coils that are terminated in sliprings to which external impedances can be connected The stator is the same as is used with a standard squirrel cage motor By changing the impedance connected to the rotor circuit, the ....

10-02-2012 0183 32 We are intending to short out the rotor prior to the Slip rings so as to ensure there will not be any sparking and resistance changes on the rotor circuitUsing a Open Loop Vector drive, , Vfd s And Slip Ring Motors Vfd s And Slip Ring Motors By Merlin26860, May 26, 2011 in Variable Speed Driv...

09-07-2013 0183 32 Re Slip Ring Induction Motor- VFD Starting 07/05/2013 7 23 AM Check if the motor was designed for converter supply If not, this is the reason for the failure The insulation system of the motor is subjected to higher dielectric stress when converter fed than in the case of a pure AC sinusoidal source...

It is doable to set up a VFD to work with the 2 speed motor and switch motor connections and VFD settings using a rotary switch , VFDs do work with older motors, but you are usually limit in the variable speed range that the motor will maintain constant torque and I would not run it above the base speed...

21-11-2002 0183 32 Yes, you can replace the slip ring starter with shorted rings and a vfd It is quite common to short the rings on the rotor itself and remove the brush assembly The torque will not necessarily be as high as can be achieved by a slip ring starter, but if you really need to have greater than 120 torque at the lower speed ranges, then use a vfd rated for higher currents ,...

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 / duty cycle exactly through precise programming...

How To Use Vfd In Slip Ring Motor In Crusher Application How To Use Vfd In Slip Ring Motor In Crusher Application Nov 21 2002nbsp018332Yes you can replace the slip ring starter with shorted rings and a vfd It is quite common to short the rings on the rotor itself and remove the brush assembly The torque will not necessarily be as high as can be achieved by a slip ring ,...

19-12-2016 0183 32 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 motor...

22-12-2015 0183 32 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 insulation...