vibrations on a gearless mill motor

(PDF) Current issues on high-power cycloconverter

Fig. 1, General scheme of a Gearless Mill Motor drive [24]. of the airgap is in the range of 15-17 mm. A tolerance of. +/- 3 mm is consi dered for setting alarm s and protections. The motor is fed ...

Remote Diagnostic Services for Gearless Mill Drives

The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names "wrap-around motor" and "ring motor" (see Figure 1). Its purpose is to generate a magnetic field in the air gap turning exactly with the desired speed of …

Current Issues on High-Power Cycloconverter

Fig. 1, General scheme of a Gearless Mill Motor drive [24]. of the airgap is in the range of 15-17 mm. A tolerance of +/- 3 mm is considered for setting alarms and protections.

Siemens' gearless drive technology powers high-capacity …

thyssenkrupp's overland conveyor is 4,700 m long, 1,830 mm wide featuring Siemens' dual 5.5 MW gearless drives operating at a design tonnage of nearly 11,000 tons per hour. Siemens also provides the e-house with MV and LV power distribution and the cooling system for motors and e-house.

TECHNICAL AND COMMERCIAL BENEFITS OF …

The first Gearless Mill Drive (GMD) with a power of 6.5 MW was installed 1969 in a cement milling process in the cement plant Le Havre in France. In the first few years, the GMD was only used in the cement industry. The GMD is also known as …

CONGA: THE WORLD'S FIRST 42 FOOT DIAMETER 28 …

mill from and a 28 Mega-Watt (MW) Gearless Mill Drive (GMD) from ABB for the Conga Project in Peru. The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft SAG mill circuit. This paper

Gearless mill drive training

Gearless mill drive training. ... The mill itself is the rotor of the motor and it is a variable speed drive, bi-directional, positioning without additional motor, power from 5 to 36 MW, sensorless speed control and full torque through the whole speed rang. ABB's design is furthermore based upon single rotor poles and each pole can be ...

Cadia GMD Stator: Preface

The remedial design of the stator of the gearless mill drive (GMD) of the 40 ft SAG mill at Cadia Hill was the project that defined the success of EAnD and the careers of its two engineering managers, Bill Lai and Chris Meimaris. ... When the motor vibrated, the vibrations were self-limiting due to the magnetic forces in the air-gap, unlike ...

Vibrations On A Gearless Mill Motor

Home Vibrations On A Gearless Mill Motor . The Case for Going Gearless - E & MJ - The Siemens 42ft gearless mill drive, still an ... At this time, the vibration frequency of the car is shown as the rated frequency of the motor: N/60*P is the extreme logarithm. Case: Six OH5000 MRL, 630KG, 1.0M/S, the main vibration frequency of the sedan is 19HZ.

QdX4 Mill Drive system

system, and one for the OPEN MILL gearing. • A wide variety of lubricants are available. Millmotor/drive High powered efficiency •Dual motor load sharing between two TMMetso QdX4 Mill Drives. • Low speed synchronous or induction. Motor with Variable Speed Drive (VSD) • Dual motor drives are capable of: – Inching and creeping

Instability in gearless mill drive motors | Semantic Scholar

Nevertheless, recent experience has shown that gearless mill drives (GMDs) are vulnerable to severe vibration at and just under twice the resonant speed. This paper proposes that the vibration mechanism is one of parametric instability as described by the Mathieu equation, which has very different characteristics from "classical" resonance.

Training Simulator for Gearless Mill Drives

sensors in the motor. A full range – from operations to fault simulations Your staff can completely simulate GMD operations – from starting and stopping the mill drive to running it in all operational modes. They can also train to program the software and change parameters. Another factor that has a direct impact on availability is ...

Mill drives – INFINITY FOR CEMENT EQUIPMENT

The gearless drive synchronous motor accelerates the mill from standstill up to operating speed. Within the range of 80- 100 0/o of the nominal speed, the best power factor can be obtained. The mill can for a limited time be operated at very low speeds for positioning the manholes of the mill shell; and no extra equipment is needed.

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS …

low speed motors connected to a pinion driving a ring gear, two low speed motors connected to two pinions and driving a ring gear, or a gearless motor mounted directly onto the mill. In addition, a gearbox can be used to reduce the speed of a high speed motor. This gearbox is then placed between the high speed motor(s) and pinion(s) and the

Increasing availability through advanced Gearless Drive …

Gearless Mill Drive (GMD) systems are characterized by having the motor wrapped around the mill like a ring. For this reason, they are often referred to as ring motors. The rotor poles are attached directly to the mill (head) flange, and hence the rotor becomes an integral part of the mill, as shown in figure 4.

Literature Review: Gearless Motor Failures – A Mill Designer's …

The complete characterisation of a ring motor requires strain gauging of rotor poles (about 8 gauge sets); strain gauging of the various stator components …

Gearless mill drives

Revamp and Modernization of Gearless Mill Drives. Technical and Commercial Benefits of Gearless Mill Drives for Grinding Applications. ABB's Gearless mill drive system is the most powerful mill drive …

How digitalized gearless drive technology …

Eleven 5MW gearless drives with synchronous motors running at low speeds (50-60rpm) drive three conveyors; two with four motors each and one with three. Two 20MW conveyors transport the ore from the open pit …

Cadia GMD Stator: Observed Behaviour and Modelling

The Cadia SAG mill diameter is 40 ft and the ring motor that drives the mill is rated at 20 MW. In 1998 when the mill and motor were commissioned both were the largest machines of their type in the world. The stator exhibited vibration excursions that appeared to be related to the mill speed. We determined the mode shape of the …

CHH624 – Gearless Mill Drive Operation and …

CHH624 – Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and in-formation …

Gearless mill drives

The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into …

High voltage motors for mills More for mining

is currently the gearless mill drive (GMD). In GMD systems the motor's poles are directly installed on a pole flange on the mill shell, and the body of the mill itself becomes the rotor. Ring-geared mill drive For mills with standard diameters or requiring less than 20 MW (approx.) of power, ring-geared mill drives (RMDs) offer the best solution.

vibrations on a gearless mill motor

CHH624 – Gearless Mill Drive Operation and …

CHH624 – Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and in-formation on safe operation and maintenance of the gearless mill drive (GMD) system. This training will help to enhance the operation and the maintenance of the GMD in order to ensure

A Mechatronic Solution Design and Experience with Large Gearless Mill …

In the mineral processing industry the use of large gearless cycloconverter drive systems for SAG-Mills has become more and more common in the recent years. Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimization of the process. The design of such large mill drive systems …

Gearless Mill Drive (GMD), para molinos

Normalmente el estator del motor, debido a su gran tamaño, viene seccionado en cuatro partes, donde cada una de estas pesa alrededor de 100 toneladas. En el caso de la División Andina de Codelco, es el único que no cumple con ese estándar, pues por ser subterránea se tiene el problema de limitaciones de espacio en el manejo de grandes …

Grinding Mill Foundations

2 – Difference between Geared and Gearless Mill Foundation Design. There is a key difference in system analysis of geared and gearless mill foundations. In gearless motor foundations, one of the main tasks is to ensure that the foundation prevents the motor from deflecting or vibrating excessively.

ABB's Gearless Mill Drive Ring Motor factory in Bilbao

Building on over 130 years of experience in the mining industry, ABB's Ring Motor factory located in Galindo provides the engineering and manufacturing of ring motors, the main component of ABB's Gearless Mill Drive (GMD) systems manufactured by ABB for the mining sector. The 20,000 m2 plant manufactured over 110 motors delivered in over 25 …

Increasing availability through advanced …

Gearless Mill Drive (GMD) systems are characterized by having the motor wrapped around the mill like a ring. For this reason, they are often referred to as ring motors. The …

The Case for Going Gearless | E & MJ

The conveyor, featuring a belt width of 1,370 mm and a belt speed of 6.2 m/s, can transport more than 5,000 mt of material per hour. Its gearless drive system is equipped with two low-speed synchronous motors with cyclo-converters (installed power of 3.8 MW, motor speed of 63 rpm, rated torque at 576 kNm) and a motor cooling system.