converting slip ring motor to vfd

Applying VFDs to existing motors | Processing MagazineKnow More

Typical slip rings in a motor 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

How To Use Vfd In Slip Ring Motor In Crushing Equipment ,Know More

Vfd on slip ring "wound rotor" motors - Variable ? ? Motor Control? Variable Speed Driv 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 ,

Slip Ring/VFD - AutomationDirect Customer ForumKnow More

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 Many DC motors are either 90V or 180V armatures and the original slip rings may be rated for this

Starting Large AC MotorsKnow More

the motor will develop at synchronous speed with rated voltage applied at rated frequency and with normal excitation Pull-In Torque The pull-up torque of an alternating-current motor is the minimum torque developed by the motor during the period of acceleration from rest to ,

Adjustable-speed drive - WikipediaKnow More

Adjustable speed drive (ASD), also known as variable-speed drive (VSD), describes equipment used to control the speed of machineryMany industrial processes such as assembly lines must operate at different speeds for different products Where process conditions demand adjustment of flow from a pump or fan, varying the speed of the drive may save energy compared with other techniques for flow .

CHAPTER 3 INDUCTION MOTOR AND DIFFERENT SPEED ,Know More

Slip ring motors: In the slip ring motor, the windings on the rotor are terminated to three insulated slip rings mounted on the shaft with brushes resting on them This allows an introduction of an external resistor to the rotor winding The external resistor can be used to boost the starting torque of the motor and change the speed-torque .

Can a VFD drive a slip ring motor? - szpowerdriveKnow More

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

Single phase input, Three phase output VFD | ATOKnow More

A single phase VFD can convert 1-phase 220v-240v to 3-phase to power the three phase motor, also can reduce the inrush current of the motor during starting up The most important thing is, it's "Cheap" in ATO online store

Slip power recovery system for variable speed operation of ,Know More

Slip power recovery system for variable speed operation of slip ring induction motor , Package solution for slip ring induction motor with variable speed control 5 ABB Slip ring induction motors - features description 6-7 , The slip ring motors are used mainly for industrial applicaitons in cement, mining and water pumping .

Three Phase Slip Ring Induction Motor - My Tech InfoKnow More

Jan 31, 2015· The slip ring induction motor could be used for industrial wires where variable speed and high starting torque are prime requirements The stator of slip ring induction motor is very much the same as that of the squirrel cage induction motor, but the construction of its rotor is very much differentStator winding can be either star or delta connected depending upon the design

Slip ring motor conversion to VSD driven standard squirrel ,Know More

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 Drives (VSDs)

Slip Ring Motor Fundamentals - brighthubengineeringKnow More

One of the main classifications of Asynchronous motors are the slip ring induction motorsDo you know what happens to slip ring motor when external resistance is added? Also Know about the special constructional features of the rotor Also appreciate the external resistances and carbon brush arrangements with the slip rings and advantages of slip ring induction motor

APPLYING VARIABLE FREQUENCY DRIVES TO EXISTING ,Know More

For existing synchronous motors to be applied to VFD operation, the synchronous motor must have its DC fi eld available at zero speed to develop starting and accelerating torque • Two types of synchronous motor fi eld exciter designs that are suitable for starting and operating on a VFD use either DC slip rings, or an AC

Motor Starters :Types of starter, Working of starter and ,Know More

Slip ring motor starters Direct-On-Line (DOL) starter:- This is the simplest method to start the small induction motor up to 5-10 kilowatt In this method rated supply voltage is directly applied to the motorBut starting current would be very large, up to 5 to 7 times of rated current

Wound-Rotor Motors — High Torque and Adjustable Speed ,Know More

Wound-rotor motors deliver speed control of heavy and high-torque loadsWhat's special about the wound-rotor motor? This type of 3-phase induction motor has high starting torque, which makes it ideal for applications where standard NEMA design motors fall short The wound-rotor motor is particularly effective in applications where using a squirrel-cage motor may result in a

Wound Rotor Induction Motors | AC Motors | Electronics ,Know More

A wound rotor induction motor has a stator like a 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 (figure below)

Generate AC with Slip Ring Motor?Know More

Mar 24, 2007· Slip rings are not alone enough to identify what you have Slip rings in AC motors can mean either a Wound Rotor motor or a Synchronous motor There is essentially no difference between a synchronous motor and a synchronous generator other than the direction of ,

Changing wound rotor drive with VFD - Entries - Forum ,Know More

Jan 29, 2009· As they are both slip ring motors the start up torque/speed curve can be made to accept the high torque requirement with a large slip atstart up, by adjusting the resistors in the rotor circuit This provides a flexible drive system I cannot open the zip file to see thedrawing, can you re send it as a pdf without being zipped up?

Variable-frequency drive - WikipediaKnow More

A variable-frequency drive (VFD) , Torque generated by the drive causes the induction motor to run at synchronous speed less the slip If the load drives the motor faster than synchronous speed, the motor acts as a generator, converting mechanical power back to electrical power This power is returned to the drive's DC link element (capacitor .

What is the importance of slip in a 3-phase induction motor?Know More

in a three phase induction motor the if the case is wound rotor then slip ring are used The winding of rotor is 3phase winding one end is shorted to form the nutral point, it can be star or delta .

Used MOTORS, AC, SLIP RING, 60 CYCLE (Wound Rotor) For ,Know More

General Electric, Frame 17, slip ring, rebuilt, 440 V Clayton Electric Motor Repair, Elon College, NC 336-584-3756 (Email: [email protected] ) Jay Clayton 200 HP

Sizing VFD for Slip Ring Motor - CR4 Discussion ThreadKnow More

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 , Sizing VFD for Slip Ring Motor 12/22/2015 2:51 PM

can we replace any slip ring motor with an induction motorKnow More

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

can we replace any slip ring motor with an induction motorKnow More

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 reworked

Slip Ring Motors - LM PhotonicsKnow More

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

Mating New Variable Frequency Drives to Existing Motors ,Know More

Motors connected to VFDs receive power that includes a changeable fundamental frequency, a carrier frequency, and very rapid voltage buildup These factors can have negative impacts, especially when existing motors are usedThere are a number of potential problems that can become real when a variable frequency drive (VFD) is used to power an existing induction motor

Is it possible to use slip ring motor with Altivar 71 driveKnow More

"With a slip ring motor, it is necessary to short circuit the winding of the rotor You can short circuit the winding of the rotor with a cable (cable of the last resistor in case of retrofit) to have more standard characteristics because this kind of motor has a low slip frequency

VFDs and Slip-Ring Induction Motors - CR4 Discussion ThreadKnow More

Feb 20, 2012· Re: VFDs and Slip-Ring Induction Motors 08/13/2009 8:49 AM Normally for the EOT Cranes when slip ring motors are used with resistance the speed is controlled through master controller motor starts with slow motion and picks up speed slowly to avoid jerks

VARIABLE FREQUENCY DRIVES THEORY, APPLICATION, AND ,Know More

motors, the range of actual slip of Design E motors is likely to be lower for Designs A and B There are a number of considerations which must be observed with Design E motors: q Good efficiency - as much as 2 points above Design B energy efficient q Less Slip - Design E motors operate closer to synchronous speed

Could we change Slip-ring Motor to Induction Motor? - VFDsinKnow More

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 / ,