mill drive failurewound rotor motor manufacturer Grasping strong production capability, advanced research strength and excellent service, Shanghai mill drive failurewound rotor motor supplier create the value and bring values to all of customers.
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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.
AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands.
pressure compensation valves makes up the innovative drive of the rotator. Gear teeth ensure a positive connection between rotor and shaft. The rotor has an external gear. Pressure chambers arise from the interaction between this external gear and the internal gear of the rotor ring. Distibutor plates are on both sides of the rotor.
a peripheral speed of 92 m/s is obtained from the rotational speed of the drive motor (n = 20,000 rpm) and the radius of the rotor used. The technical information on rotor speed mills often gives the idling speed. The equation above, however, always presupposes that there is material in the mill.
2 GEARLESS MILL DES The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor. Building a track record
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. .
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.
Right from the beginning we have high performance slow-running motors for the metal industry in our delivery program. After direct current motors having dominated for a long time, today dynamic, high-quality three-phase motors are used: for larger torques as synchronous machines as solid pole versions, for smaller torques as asynchronous squirrel-cage motors.
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 pages.
The 50 Failure Modes of Electric Motors. June 18th, 2014. ... This will ultimately lead to a rotor making contact with a stator and creating another point of failure. Again, improper rebuilding tactics, such as overheating, can damage rotor components as well. ... cycling and flexing, along with AC drive stress, round out the possible failure ...
Troubleshooting Induction Motors William R. Finley Senior Member Large Motors & Pumps ... • Motor has inadequate torque to drive the load. • Motor takes too long to start. ... that will produce excess heating in the stator winding and rotor bars, but will not produce useful power output. Derating of the
Pellet mill Type Paladin 1600 D The authentic and sturdy Paladin de-sign is constructed with a balanced twin drive system, where the trans-mission consists of a combination of V-belts and a toothed belt. The design of the main shaft and rotor allows maximum torque to be applied in the pelleting section. These features make the Paladin pellet mill
Aug 15, 1972· MOTOR DRIVE SYSTEM FOR ROLLING MILL BACKGROUND OF THE INVENTION This invention relates to a motor drive system for rolling mills of the type used to reduce the thickness of strip material passing through the mill. Rolling mills of the so-called four high type are widely used.
Torque Capabilities of DC and AC Drives in the Constant Horsepower Range Using a Wound Rotor Motor ... 1725 RPM wound rotor motor. A new drive was desired that would eliminate the seventy year old controls and motor. The replacement would be required to increase the speed of the machine so that the maximum possible production would be achieved ...
Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself becomes the rotor of the gearless motor.
Froment's "mouse mill" motor was an early form of electric motor, also known as the Revolving Armature Engine. It has similarities to both the synchronous motor and the contemporary stepper motor.. As the mouse mill motor was simple to construct and its speed could easily be governed, it was later used to drive automatic recorders in telegraphy.
• Drive 1 - A 5000 HP, 1200 rpm wound rotor motor with liquid rheostat and power factor correction capacitors to a dual pinion gear driven mill; • Drive 2 - A 5000 HP, 514 rpm synchronous motor with an air clutch and gear box to a center drive mill; a Drive 3 - A 5000 HP, 514 rpm synchronous motor with soft-start and an air clutch and
HiTorque Drive System: The SIEG drive on the mini lathe and mini mill incorporates a 350 Watt conventional wound rotor DC motor and PWM controller card. The gears provide two speed ranges to enhance low speed torque because the output torque of a DC drive like this falls off as the motor .
In the 1980s, a joint effort between EPRI and General Electric showed that 10 percent of motor failures were due to the rotor. The rotor, although a small percentage of the motor problems, can influence other fault zones to fail. When a motor is started with a broken or cracked rotor bar, intense heat is generated around the vicinity of the break.
Sep 10, 2014· Even the rotor poles of a ring motor are more complex than a mill structure. ... The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. The motor had to fit through a tunnel on the road to the site. ... Gearless motor failures – a mill designer's ...
ball mills, the starting torque restrictions of some of the newer mill drive When utility softness was a concern, the supersynchronous motor was used. chronous motor is seldom used in the small horsepower range because of its cost . Wound rotor motors are reliable drives for large ball mills, large . The synchronous motor is . Read more
Ac Squirrel cage motors draw around 500% to 900% of Full Load Current (FLC) during starting. This might not pose a huge concern when starting motors with low kilowatt (kW) ratings but as soon as one starts talking about mill drive applications where the installed motors are generally in the range of 800 kW up to 15 000 kW, it does become a concern.
Fig. 2 shows a variety of different rotor shafts used in typical electric motors. B. Motor Shaft Materials For most motor applications, hot rolled carbon steel is a good choice. When higher loads are present, an alloyed steel such as chromium–molybenum (Cr–Mo) is frequently used, and for applications with extreme corrosion or hostile ...
plied gearless drives for two 36-foot ring motors, de-veloping a 12,000 kW gearless drive for the Kennecott, Utah, SAG mill and a 11,200 kW gearless drive for the El Teniente, Chile, SAG mill. In a continued call for larger, even more powerful drives, Siemens kept pace. In .
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