Wound Rotor Motor Mill Drives

Wound rotor motor Wikipedia

So, we are able to control the speed of this type of motor easily. A wound-rotor motor can be used in several forms of adjustable-speed drive. Certain types of variable-speed drives recover slip-frequency power from the rotor circuit and feed it back to the supply, allowing wide

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BALL MILL DRIVE MOTOR CHOICES artec-machine

the wound rotor motor was preferred. In the late 1950s, when mills approached 2500 HP, the center drive mill arrangement with the enclosed geared drive using a high-speed synchronous motor became quite popular. In more recent times the wound rotor motor with the liquid rheostat has come into use in

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MOTOR TECHNOLOGY Saving energy TMEIC

mills. In fact, until about 1985, a wound rotor induction motor was the only large ac motor that controlled starting characteristics and adjustable speed capability. Stator R ot r Slip Rings 3-Phase stator connections 3-Phase rotor connections to ex tr nal si c Figure 1: wound rotor induction motor Starting duty rated Utility Interface

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liquid rotor starter for ball mill YouTube

28-6-2019· The method of powering mills such as AG, SAG and Ball has a Fixed speed drives, with wound rotor motors or synchronous machines, were the Liquid Resistor Starter (LRS) are containing agitated mechanical parts requiringCHAPTER CHAPTER CHAPTER(wye-delta) starter, auto transformer or other forms of reduced-voltage .. Ball mill. 30–50.

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vfd on slip ring "wound rotor" motors Variable

7-2-2008· 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. .

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Wound Rotor Induction Motor The Engineering

Wound Rotor Induction Motor is used in applications which require smooth start and adjustable speed. Some of the applications of this motor include cranes, mills, hoists and conveyors. Wound rotor induction motor is also used in fans, blowers and mixers. They are used in large pumps in water industry.

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Can a VFD run a wound-rotor motor?

The wound-rotor motors use resistor to connect the rotor windings. The resistance can be adjusted to control the speed/torque characteristis of the motor. To use a variable frequency drive with a wound-rotor motor the resistors would need to be shorted. It is also recommended to use a dv/dt filter on the output of the drive to smooth the PWM.

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Specialty Products and Services Benshaw

Wound Rotor Motor Starters. Wound rotor motors are typically used in application requiring high starting torques, a limited number of operating speeds, Benshaw has successfully applied a 480VAC 700HP AC Variable Frequency Drive for positioning a MV synchronous motor driven ball mill.

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What We Do: Drives Synergy Eng

Commonly used for low-speed reversible high-power motor drives, cycloconverters generate inter-harmonic currents to reduce network disturbances and voltage distortion. Applications for cycloconverters include steel rolling mills, rock crushers, and conveyors for material handling. Wound Rotor Induction Motor

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What We Do: Drives Synergy Eng

Commonly used for low-speed reversible high-power motor drives, cycloconverters generate inter-harmonic currents to reduce network disturbances and voltage distortion. Applications for cycloconverters include steel rolling mills, rock crushers, and conveyors for material handling. Wound Rotor Induction Motor

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Can a VFD run a wound-rotor motor?

The wound-rotor motors use resistor to connect the rotor windings. The resistance can be adjusted to control the speed/torque characteristis of the motor. To use a variable frequency drive with a wound-rotor motor the resistors would need to be shorted. It is also recommended to use a dv/dt filter on the output of the drive to smooth the PWM.

Get Price

Specialty Products and Services Benshaw

Wound Rotor Motor Starters. Wound rotor motors are typically used in application requiring high starting torques, a limited number of operating speeds, Benshaw has successfully applied a 480VAC 700HP AC Variable Frequency Drive for positioning a MV synchronous motor driven ball mill.

Get Price

Slip ring motors

MENZEL slip ring motors, also called wound rotor motors, are available in all current motor cooling and protection types for low-voltage from 75 kW as well as medium and high voltage up to 15000 kW. They set technical standards in terms of size, performance, economy and reliability.

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TECO-Westinghouse Wound Rotor Motors

What makes the wound rotor motor a unique induction machine is its rotor. Instead of a series of rotor bars, a set of insulated rotor coils is used to accept external impedances. The rotor windings are similar to those found on a DC armature, with the coils connected together to a set of rings that make contact with carbon-composite brushes.

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Use of variable frequency drives with wound rotor

The slip ring or wound rotor induction motor (WRIM) has been used in a variety of applications. Many of these applications use the WRIM’s high starting torque capabil­ity while limiting current to start and run very high inertia loads such as hammer mills, rolling mills, centri­fuges, and rotary kilns.

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Wound Rotor Induction Motors AC Motors

31-12-2019· 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 brushes. 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

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75kW Wound Rotor Control For Steel Rolling Mill

75kW Wound Rotor Control For Steel Rolling Mill; 75kW Slip Ring Fed Wound Rotor Motor Control For Steel Rolling Mill. MCW were asked to produce a control system for 75kW slip ring fed, wound rotor induction motor that was being used to drive a steel rolling mill via a Radicon gearbox.

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Starter of SAG Mills with rotor resistance

17-9-2013· wound rotor motor is not the best option for SAG mills becuse the slip rings always are a problem even with liquid resistors.Best option is synchronuos motor in combination with variable frequency drive. However if you already have the wound rotor motor the ERS operation is simple.

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Slip ring Induction Motor, How it works ? YouTube

18-9-2018· Induction motors have been ruling the industrial world for many decades. In the induction motors used in lift and hoists, you will see a type of rotor called a slip ring rotor, whereas in most of the other applications you will see a simpler, squirrel cage type of rotor. Why are there two different designs of rotor

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Can a VFD run a wound-rotor motor?

The wound-rotor motors use resistor to connect the rotor windings. The resistance can be adjusted to control the speed/torque characteristis of the motor. To use a variable frequency drive with a wound-rotor motor the resistors would need to be shorted. It is also recommended to use a dv/dt filter on the output of the drive to smooth the PWM.

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Starter of SAG Mills with rotor resistance VFD AC

Each mills have two motors of 8000 kW at 13.8 kV. A: For large mills requiring variable speed, the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW. Above 16MW, the gearless drive (cyclo-converter) is typically used because gearboxes and pinion gears reach their present limit in size.

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Torque Capabilities of DC and AC Drives in the

Torque Capabilities of DC and AC Drives in the Constant Horsepower Range Using a Wound Rotor Motor Replacement as a Typical Application Example To use a wound rotor motor as an adjustable speed drive, the rotor control resistors must be rated for continuous current.

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WikiZero Wound rotor motor

So, we are able to control the speed of this type of motor easily. A wound-rotor motor can be used in several forms of adjustable-speed drive. Certain types of variable-speed drives recover slip-frequency power from the rotor circuit and feed it back to the supply, allowing wide

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Changing wound rotor drive with VFD Entries

Dear all, i have task to change two motor drives of wound rotor type with new VFD drives, data about old drives is given in atachments, i need some sugestions which drives should be

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Slip ring Induction Motor Fundamentals

Slip ring Induction motor is also known as wound rotor induction motor. Slip ring motor has main two parts as we know: Stator and Rotor. The stationary part of the motor is called stator and rotary part of the motor is called rotor. The works of the stator is common in all motor to develop a magnetic field.

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Wound Rotor Induction Motor Slip Power Recovery

Wound Rotor Induction Motor Slip Power Recovery. Large wound rotor induction motors (WRIM) have been used in some industries for decades. In the cement and mining industries, high horsepower WRIMs are used on large grinding mills, where they have the advantage of controlled starting characteristics and adjustable speed capability.

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Wound rotor motor All industrial manufacturers

Find your wound rotor motor easily amongst the 66 products from the leading brands (GE Motors, SIEMENS, ABB,) on DirectIndustry, the industry specialist for your professional purchases. cement ball-mill twin drives Slip Ring or other wound type rotor motors are used all over the world.

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CoE Open-pit Mining Cottbus ECOSS Electronic

Slip-ring motor 3. S h o r t-c i r c u i t C c o n t a c t o r C o n t r o l a a c t i o n s F e d d b c k s i g n a l s Profibus PWM Snubber module Starting resistors Snubber resistors Drivers Permanent slip resistor R e c t i f i e r I G B T R e s i s t o r s RDCU drive control unit D

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LCI'S AND SYNCHRONOUS MOTORS APPLIED TO ROLLER MILLS

asynchronous and synchronous motors have been utilized. Many mills are powered by wound rotor induction motors (WRIM) with some form of secondary control. A benefit associated with variable secondary resistance, for a wound rotor induction motor, is the reduction in starting current. This can be

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