Crushing & Grinding Machines

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...

Hoists Crane Duty Motors Crane And Hoist Duty Motors

Introduction -Crane and Hoist duty motors from Bharat Bijlee are ideal for frequent starts / stops and reversing They are also used for applications such as materials handling weirs and sluices lifts of all types and auxiliary motors...

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 VFD...

Variable Frequency Drive in Hoist and Crane Industries

Compensatory externals to aid in starting torque generation for synchronous motors are also basically expense burdens that need not be borne The cost of the synchronous motor itself over the asynchronous motor with increased in frame size added copper and other materials is another base reason synch motors are seldom if ever used in the overhead hoist...

VFD driven motor in crane application GoHz

Oct 21 2015 0183 32 We are looking at an approx 90 efficiency rating using asynchronous motors with the proper VFD s With using regen instead of dynamic braking resistors both in deceleration in traversal motions and in the overhauling effect of the load to the motor in lowering mode the energy generated by the motor is channeled back to the line source instead of being dissipated away as heat...

Choosing motors for crane application

Jul 19 2011 0183 32 Old motors are slipring motors I will put drive for control too 1 If I choose squrrel cage motors should I predict to be 30 bigger motors then slipring I know that Tm/Tn of squerrel cage motors are much smaller then Tm/Tn on slipring motorsI don 180 t know how to calculate Tstart and wich motors have biger Tstart 2...

Application notes VFD Brake control KEB

As an example we will look at a system consisting of a KEB F5 VFD KEB induction motor with rear mounted KEB Combistop brake The application will be a hoist system in which a load is moved vertical in the upward and downward direction using volts/Hz control of the motor...

Premature motor winding failures on VFD driven motors in

Extreme altitude 4500m VFD applications required voltage derating to prevent corona at reduced atmospheric pressure - essentially 575V rated VFDs operated at 380V and motors wound with...

VFD Control of Hoist Motor and Break Automation

Jan 21 2019 0183 32 I have done lots of Hoist / Crane applications with VFDs specially Siemens MM4 Sinamics G120 S120 There are some features that allow Overlap between VFD holding the motor using DC injection brake and enabling the mechanical brake if you need more info feel free to contact me email protected...

VFD with encoder feedback for hoist application GoHz

Oct 05 2015 0183 32 A VFD with encoder feedback can also provide very good speed control at very low speeds for more precise positioning In quick summary you can make a VFD without an encoder work but this is a Hoisting application and it won t be as SAFE nor will it work as well as a suitable VFD...

APPLYING VARIABLE FREQUENCY DRIVES TO EXISTING

However if this motor is operated on a VFD the utility power line sees the reactive power level set by the drive incoming converter not the motor Therefore if the synchronous motor is being used for power factor correction to the plant this will not be a suitable application to power this motor from a VFD Positive Aspects of VFD...

VFD s and MOTOR STARTERS Mike Holt s Forum

Jun 13 2015 0183 32 VFD does essentially replace a motor starter in applications where they are used there still can be control schemes where a contactor may be used to interrupt power - typically only for occasional shut down situations and not as a routine control method - VFD...

Sizing VFD for Slip Ring Motor

Dec 22 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...

Best presentation on VFD Power Inverter Rectifier

main hoist/ creep motor auxiliary hoist / creep motor cross travel / creep motor long travel / creep motor range of eot cranes in ntpc 75 t 105 t conventional practice slip-ring induction motor employing resistance cut-in/ cut-out for speed control cabin /pendent control vfd...

Use of variable frequency drives with wound rotor motors

Jim McKee deceased Alabama Electric Motor Service Sheffield Alabama Technical Education Committee Member The slip ring or wound rotor induction motor WRIM has been used in a variety of applications Many of these applications...

Motion Scenarios Lifting and Hoisting Machine Design

Confirms Corey Morton Engineering Manager at B R Industrial Automation In a hoisting application the motor actually generates power back to the drive when the hoist is lowering its load...

Crane Duty Motors Slip Ring Crane Duty Motors Squirrel

Crane duty squirrel cage motors when used with inverter drives give better current control speed control improved operation Current control is similar or better than slip ring motors maintenance cost /efforts are less than equivalent slip ring motors Current control of VFD driven motors is better than standard squirrel cage motors...

What are the Benefits of a VFD Wolf Automation

Oct 10 2016 0183 32 Example A VFD controlling a pump motor that usually runs less than full speed can substantially reduce energy consumption over a motor running at constant speed for the same period For a 25 horsepower motor running 23 hours per day 2 hours at 100 speed 8 hours at 75 8 hours at 67 and 5 hours at 50 a variable-frequency drives...

PRABAL SERIES

Crane duty motors are used for following applications in majority Cranes hoists long travel drive cross travel drive main hoist auxiliary hoist Material handling equipments various conveyors Lifts Rolling mills Manufacturing range for cast iron slip ring crane duty motors...

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 to...

What are the important parameters while selecting AC motor

Oct 25 2008 0183 32 Slip-ring motors in hoist applications are often replaced with variable frequency drives VFDs and squirrel cage motors The new motor should be specifically rated for VFD use The most important reason for using a VFD rated motor is to make sure the motor insulation can withstand the voltage transients that are generated due to the VFD...

Replacement of Slip Ring Motor With Squirrel Cage Motor

Nov 05 2011 0183 32 The crane is having 4 motions long travel cross travel main hoist auxilliary hoist For all above purposes slip-ring induction motors are used I want to replace these motors with squirrel cage induction motors run by VFDs I am choosing the squirrel cage motor with same number of stator poles as that of slip-ring motor...

Application of Slip Ring Induction Motor

The Slip ring induction motor possesses a high Starting Torque and low starting current It is used mainly for - Conveyors Cranes Compressors Elevators and Hoist etc Advantages A slip ring 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...

VFD driven motor in crane application GoHz

Oct 21 2015 0183 32 We are looking at an approx 90 efficiency rating using asynchronous motors with the proper VFD s With using regen instead of dynamic braking resistors both in deceleration in traversal motions and in the overhauling effect of the load to the motor in lowering mode the energy generated by the motor...

VFD Fundamentals Troubleshootingppt

VFD Fundamentals Troubleshooting 1199--FFeebb--20102010 13 Aberdeen Way Elgin SC 29045 Cell 803 427-0791 By Timothy S Irwin PE Sr Engineer...

AC drives VFD for industrial crane and hoist movement

Crane applications served by Danfoss driv Hoist Lifting and lowering of the load Bridge gantry or long travel The part of an overhead crane consisting of girders trucks end ties walkway and drive mechanism which carries the trolley and travels in a direction parallel to the runway Trolley or cross travel The unit carrying the hoisting mechanism which travels on the bridge rails...

Variable frequency drive for Crane Hoist

VFD Derating Derating a variable frequency drive means using a larger than normal VFD in the application Derating is required when a VFD is to be operated outside the normal operating range specified by the What is the optimum range to test motor insulation If it s a 460V motor the 1000V range should give a good indication...

Hoists Crane Duty Motors Crane And Hoist Duty Motors

Application Slipring motors are used for systems specifying limitations on starting current for high inertia drives and for frequent starting The motors are eminently suitable for high mechanical and electrical stresses encountered under heavy duty conditions such as excavating machinery scrapers and winders straightening machines stone...

DBR VALUE CALUCULATION FOR VFD DRIVE

Dec 16 2013 0183 32 Hi friends i need dynamic braking resistor for 75kw simovert master drive Here this drive using for hoist application motor rating also 75kw- induction squirrel gage motor Anybody how to caluculate dbr value for certain vfd...