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converting slip ring motor to vfd

Can a slip ring motor run through a variable frequency drive?

Oct 25, 2016· The main difference between slip ring and cage types is that the slip ring rotor generally has a much lower slip at full speed than the cage rotor if it is properly shorted directly at the rings. We need to check that the variable frequency drive (VFD) slip setting can go low enough.

vfd - How to determine full-load RPM of an induction motor ...

How to determine full-load RPM of an induction motor at any arbitrary frequency? Ask Question Asked 1 year, 11 months ago. ..., I am using a "VFD-B" variable frequency drive on my induction motor. (manual, website) ... How can I find the slip speed of a slip ring induction motor without knowing the rotor speed (rated RPM)

vfd on slip ring "wound rotor" motors - Variable Speed ...

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. .

Slip Ring Motors - lmphotonics.com

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.

Could we change Slip-ring Motor to Induction Motor? - VFDs.in

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 / …

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

Used MOTORS, A.C., SLIP RING, 60 CYCLE (Wound Rotor) For ...

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

Generate AC with Slip Ring Motor? - practicalmachinist.com

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 …

Single phase input, Three phase output VFD | ATO.com

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 ring motor conversion to VSD driven standard squirrel ...

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).

Variable-frequency drive - Wikipedia

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 ...

How to convert a slip ring motor into squirrel cage motor ...

May 13, 2017· With the advent of variable-frequency solid-state power supplies, speed variation can be provided by the more reliable, less expensive squirrel-cage motor. Users occasionally inquire as to the feasibility of converting an existing wound-rotor moto...

Change synchronous motor to induction motor - VSD

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 train.

Winding down not out - HOIST magazine

Nov 21, 2012· With the advent of variable frequency drives (VFD), converting wound rotor hoist and crane controls to variable frequency control systems is becoming a relatively commonplace occurrence. Generally, the motor conversion involves grounding out the wound rotor slip rings internally, allowing removal of the rotor brush and slip ring assemblies.

Is VFD system better than slip ring system in sq cage motor?

For high torque requirement, we need to over size both sq cage motor and variable frequency drive. Should we invest this solution? or operate the same system? sq cage Which reason sq cage motor and VFD system better than slip ring system? Some slip-ring motors can generate a very high starting torque, much higher than torque available at the output of squirrel-cage motors inverter driven.

Three Phase Slip Ring Induction Motor - My Tech Info

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 different.Stator winding can be either star or delta connected depending upon the design.

Mating New Variable Frequency Drives to Existing Motors ...

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 used.There are a number of potential problems that can become real when a variable frequency drive (VFD) is used to power an existing induction motor.

ABB drives - Technical guide No. 4, Guide to variable ...

the electric motor All of the machines mentioned earlier in this guide are com-monly driven by electric motors. It can be said that the electric motor is the workhorse of industrial processes. In this chapter, we will take a closer look at electrical motors - especially the squirrel cage AC motor, which is the most common motor used

Is it possible to use slip ring motor with Altivar 71 drive.

"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.

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 ...

Vfd's And Slip Ring Motors - Variable Speed Drives - LMPForum

May 26, 2011· Vfd's And Slip Ring Motors - posted in Variable Speed Drives: One for the Boffins, Has anyone had experience in using VFD's on Wound Rotor Motors? We are intending to short out the rotor prior to the Slip rings so as to ensure there will not be any …

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 …

Difference between Slip Ring Motor with Conventional Drive ...

bars and rings as a whole, they are much like an animal's rotating exercise cage, hence the name. In a WRIM (Slip Ring Motors), the rotor winding is made of many turns of insulated wire and is connected to slip rings on the motor shaft. An external resistor or other …

Slip power recovery system for variable speed operation of ...

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 ...

Motor - convert to VFD usage? [Archive] - The Home Shop ...

I found some info on the net and having the slip rings connected to the variable resistance seems to match this application, even to the way that it will only start with the controller above mid point, a characteristic of rotor control apparently. I think safest answer is to swap it all out for a new motor with VFD.

Using VFD with slip-ring motors - Electric motors ...

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 cost.

Can a VFD drive a slip ring motor? - szpowerdrive.com

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.

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

VFDs and Slip-Ring Induction Motors - CR4 Discussion Thread

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.

converting slip ring motor to vfd - royalcrescentgroup.in

Vfd's And Slip Ring Motors - Variable Speed Drives - … Wound rotor motor work well with inverter drives however. If this is a retrofit, fitting a VSD / VFD to a system originally operated with slip ring resistors retain one …