Fig. 1 shows a picture of the SAG mill. Fig. 1 A Picture of a Semi-Autogenous Mill 2.1.2 Modelling Equations of the SAG Mill Driven Motor Generally, in the mathematical modelling of electrical machines, they are first of all described as coupled stator and rotor polyphase circuits in terms of phase variables. The next step is to transform the

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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.

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This paper presents the development of phase and qd space vector models of the 2-stator winding synchronous motor used in SAG mill drives. Using a space vector rotation transformation, the two ...

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The massive electric motors, with diameters of 40 and 28 foot respectively and with each stator quadrant weighing approximately 100 tons, are the largest M&C has helped install to date and ...

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• Structural stress impact of the magnetic pull to the stator after energizing the drive • Motor behavior during normal operation with a loaded mill The result is the design of a …

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Figure 1 SAG Mill and synchronous motor . ... motor heating from stator I. 2. R, Rotor I. 2. R, and core losses changes as a function of speed as shown in Figure 5. The

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Mill heads are key structural components of any grinding mill. They must carry the load. of the shell assembly, liners, media and material in process, and transmit it evenly to. the trunnion bearings to …

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The massive electric motors, with diameters of 12.2 and 8.5 m respectively and with each stator quadrant weighing some 100 t, are the largest M&C has helped install to date and probably the largest in Africa. ... Each SAG mill motor was completed in less than 25 days, while the ball mill motors were completed in less than 23 days.

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Typical drive configurations of high-capacity SAG mills uses a two-stator windings vector controlled synchronous motor, with 30º shift between the two windings, fed by a two secondary's delta-delta-wye power transformer and two 6-pulse cycloconverters. Paper presents and evaluates three different modeling options for the SAG mill drive. First …

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Cadia SAG Mill motor and ball mill gears 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 …

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Due to the great technical knowledge and safety protocols of Outotec in this type of work, Codelco Andina invited the company to participate in the change-out of two of its 7500 and 8500 HP SAG grinding ball mill motors in the interior of its underground operation. This was not a minor challenge considering the size of the components and ...

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• A Squirrel Cage Induction Motor is the most common 3 phase motor found in a mill or plant. It is both rugged and simple in design, making it both economical and reliable. • The SCIM has 2 basic components, a stator (the stationary component) and a rotor (the rotating element). In addition, a motor has bearings that allow the rotor to freely

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"Loose stator coils in synchronous motors will generate fairly high vibration at Coil Pass Frequency (CPF) which equals the number of stator coils x RPM (# Stator …

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This paper presents and evaluates three different modeling options for the SAG mill drive. The first option considers a complete model in phase and $qd0$ …

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1 x SAG Mill & Siemens Motor For Sale/Re-Assignment Mill Details Type of Mill SAG Mill Mill Dimensions 11,582 mm x 7,759 mm (38' x 26') (D x L) Default Mill Speed 7.5-8.0 RPM Mill Speed 7.56-10.08 RPM Liners Excluded Mill Drive Motor Type Wrap Around (included) Mill Drive Motor Size 19,400 KW (26,016 hp) Variable Speed …

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Paper presents and evaluates three different modeling options for the SAG mill drive. First option considers a complete model in phase and qd0 variables of the two-stator winding …

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Variable Speed Drives. Variable speed drives are not new. Many have been used in the cement industry on mills drawing up to 6,525 kW (8,750 hp). There are 39 gearless drive installations worldwide, but …

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There are two GE motors for SAG mill but unfortunately sometimes current draw exceeds more than 300 A in one of them and makes SAG mill shut down. I was not sure about process issues. ... it may well be that one of the motors has insulation problems on windings in either rotor or stator, or other issues that are influencing its performance ...

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Unlike more traditional ring-geared mill drives – where a ring-shaped gear encircles the mill and drives it through one or two pinions followed by conventional motors – GMDs work by mounting rotor poles directly to the mill body and surrounding it with the stator ring, meaning the mill itself is incorporated into the motor. The necessary ...

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Download scientific diagram | Construction of a SAG mill with the stator and the rotor separately mounted. from publication: Control of Large Salient-Pole Synchronous Machines Using Synchronous ...

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The rotation speed of a mill is an important factor related to its operation and grinding efficiency. Analysis and regulation of the optimal speed under different working conditions can effectively reduce energy …

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The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double winding, fed by two Three–Phased Cycloconverters. The rotor has salient poles without dumping windings …

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Abstract: Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30° shift between the two windings, fed by a two-secondary delta-delta-wye power transformer and two six-pulse cycloconverters. This paper presents and evaluates three different modeling options for …

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The control vector u includes voltages of stator, excitation current of the synchronous motor and the load torque reaction produced by the mill charge. It may …

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Fig. 1 shows the construction of a SAG mill [2]. It consists of a rotating hollow cylinder of about 12 m in diameter. Two sets of bearings in ring-shaped structures support the cylinder to let it ...

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Abstract: Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30 $^{circ} $ shift between the two windings, fed by a two-secondary delta-delta-wye power transformer and two six-pulse cycloconverters. This paper presents and evaluates three different modeling options for …

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one SAG mill (9.75 dia.(m)*3.88 length(m)) following two parallel ball mills (5dia.(m)*7lenght(m)). The aim of this research work was to investigate on the ball filling estimation of Miduk semi-autogenous (SAG) Mill via an utilized method. Miduk SAG Mill circuit is shown in Figure 1. Figure 1: Diagram of Miduk Copper Complex

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Hence, the development of modeling tools of SAG mill drive systems that help to analyze and prevent costly long-time outages, are of great benefit. This paper presents the development of phase and qd space vector models of the 2-stator winding synchronous motor used in SAG mill drives. Using a space vector rotation …

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Whether you're talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator. That's why we always design our Gearless mill drives drives to combine maximum performance with limited space requirements. Suitable foundation and adequate ground conditions Since our solutions have a low motor weight, this notice-

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A detailed evaluation of a SAG mill starting is presented using three different modeling options. First option considers a qd0 model of the two-stator windings synchronous motor fed by two 6-pulse ...

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According to the deployment of armature stators, MGPMs can be generally classified into three types, viz., MGPM with inner armature stator (MGPM-IAS), MGPM with outer armature stator (MGPM-OAS ...

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