Wound Rotor Motor Mill Drives

Wound Rotor Motor Mill Drives

Ball Mill Drives - Mineral Processing & Metallurgy

Several types of ball mill drives can be furnished, made up of various combinations of gearing, motors and transmission equipment. The correct combination to be selected takes into consideration power requirements, gear ratings, floor space, interference from other plant equipment and motor characteristics. The main types are described and illustrated on these …

wound rotor motor mill drives - aadvanderzwan.nl

Motor The GMD is a drive system without any gear where the transmission of the torque between the motor and the mill is done through the magnetic field in the air gap between the motor stator and the motor rotor The concept to drive the mill this way is relatively simple using the mill body as motor rotor and mounting the poles there [24/7 Online ]

Wound rotor motor - Wikipedia

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 speed range with high energy efficiency.


The choice of a wound rotor motor requires the use of power factor correction capacitors to meet the power factor requirements of the electrical utility. The cost of these capacitors needs to be included in the analysis of mill motor drive systems. These drives typically have an inrush of 150% - 200% during starting. The

Wound Rotor Induction Motor - The Engineering Projects

Oct 10, 2016 · 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.

Use of variable frequency drives with wound rotor motors ...

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.

Advantages of SER drives for SAG mills | GoHz.com

Dec 19, 2014 · 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 …

Wound Rotor Induction Motors | AC Motors | Electronics ...

A wound rotor induction motor may also act as a generator when driven above the synchronous speed. Since there are connections to both the stator and rotor, such a machine is known as a doubly-fed induction generator (DFIG).

Variable-frequency drive - Wikipedia

Wound-rotor synchronous motors can be run at even higher speeds. In rolling mill drives, often 200-300% of the base speed is used. The mechanical strength of the rotor limits the maximum speed of the motor.

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

Feb 07, 2008 · Rotor resistors alter the slip of the motor and produce high slip losses. At half speed, the power dissipated in the rotor resistors is equal to the power produced to the load. For normal applications, you can apply a VFDto a slip ring motor by shorting out the rotor (no resistors) and applying the VFD to the stator as per a normal induction motor.

Specialty Products and Services | Benshaw Advanced ...

Wound Rotor Motor Starters. ... Benshaw has successfully applied a 480VAC 700HP AC Variable Frequency Drive for positioning a MV synchronous motor driven ball mill. The Benshaw variable frequency drive powers the 4160Volt - 3500HP synchronous ball mill motor during positioning to smoothly rotate the ball mill and bring it to the proper position ...

Wound-Rotor Motors — High Torque and Adjustable Speed ...

Wound-rotor motors deliver speed control of heavy and high-torque loads.Whats 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

Whats the Difference? - LittleMachineShop.com

The HiTorque drive system on the mini lathe and mini mill incorporates a 500 Watt brushless DC motor and controller. The wound stator and permanent magnet rotor provide virtually constant torque over the entire speed range.

TECO-Westinghouse Wound Rotor Motors

Wound rotor motors are an extremely versatile breed of induction motors. Featuring a rugged design, these machines provide the unique ability to gradually bring up to speed high-inertia equipment and large loads smoothly and easily. Wound rotor motors also can develop high starting torque at standstill – while maintaining low inrush.


Wound rotor induction motors (WRIM) have been popular for decades in the cement and mining industry for starting and driving large grinding 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

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