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Increasing availability through advanced Gearless Drive

The Gearless Mill Drive system consists of the ring motor with its feeding cycloconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation sys-tem (for mill and motor) including HMI, monitoring and diagnostic system, MCC’s (for mill and drive auxiliaries),

Starting Cursale Gearless Mill Drive

Gearless Ball Mill Drive. Finally a 4500 kw ball mill is used to analyse the startup process with different torque caused by dead time in the current control of a highpower gearless mill drive the drive motor of the large ball mill is usually required to start with

Gearless Mill Drive Sales Rev Up to Meet Demand

Gearless mill drives are becoming the drive system of choice on large AG, SAG and ball mill installations for new ... Synchronous motors have a high inrush starting current—400% to 600% of nominal current. The starting torque depends on the motor design and can’t be adjusted later on.

Increasing Availability through Advanced Gearless Drive

start the motor and to vary speed during operation, which means that it satisfies both requirements. The comparison of a conventional drive train to a gearless drive for a grinding mill is shown in Fig. 1. Figure 1 – Top view of SAG-Mills with alternative drive options; left side: dual pinion drive including

Current issues on high power cycloconverter Fed gearless

starting with full torque within limited short-circuit level, ... “15000-HP gearless ball mill drive in cem ent-why not!”, ... of this dead time in the current control of gearless SAG mills. View.

TYDP Series Direct Drive amp Gearless PMSM enneng

TYDP Series Direct Drive & Gearless PMSM. ... Directly driven by electric power, large starting current; The volume of power supply transformer is increased, and the running is not stable when starting, which causes a certain impact on the belt; ... For the ball mill of A type synchronous motor, the transmission efficiency can be improved by 15 ...

ABB Gearless Mill Drive Users Meet in Peru E amp MJ

ABB reported that it held the most recent of its Gearless Mill Drive (GMD) User Meetings in Lima, Peru, during October 23–24. The conference, a cooperative event between ABB Switzerland and ABB Peru, was the fourth meeting of its type, following a global event held in Switzerland in 2007 and after two regional events in Santiago de Chile and ...

PDF Operation of High Power Cycloconverter Fed Gearless

The gearless drive and the CCV must be designed to resist the short-circuit current and the generated high torque. The feeding circuit breaker of the drive must provide a …

US3272444A Gearless rotary mill Google Patents

US3272444A US305076A US30507663A US3272444A US 3272444 A US3272444 A US 3272444A US 305076 A US305076 A US 305076A US 30507663 A US30507663 A US 30507663A US 3272444 A US3272444 A US 3272444A Authority US United States Prior art keywords mill rotor motor receptacle gearless Prior art date 1963-08-28 Legal status (The legal status is an assumption and is not a legal …

Preprint 13 050

Presently the gearless drive is more costly than the complete mechanical portion (mill rotating element and accessories supplied by the mill manufacturers) and hence the customer/consultant needs to have two parties to deal with from the start of any project. There is an interface between the mill vendor and the gearless motor supplier.

WO2013113803A1 A gearless drive for a rotating

A gearless drive for a rotating electrical machine comprises a rotor (12) in the form of a hollow rotatable body (10) and having an axis of rotation and a stator (14) surrounding the rotor (12). A plurality of pole bodies (16) are independently mounted circumferentially around the rotor (12) by a pole mounting arrangement (18). The stiffness of the pole mounting arrangement (18) in the radial ...

siemens.com mining SIMINE Gearless Mill Drives

The SIMINE Gearless Mill Drives now starts the mill directly from this unbalanced position. This mode allows inspec-tion of different points on the mill shell or inside the mill quickly one after the other without the need to balance the mill in between. The operator can even change the direction of rotation at the local control panel and let the mill turn in the other direction.

Ring geared mill drives Grinding ABB

Soft-starting – Smoothly starts the mill without mechanical shocks and limits the current drawn from the network, avoiding unexpected downtime due to voltage unbalances. Frozen charge remover – Avoids human contact with the mill and speeds up the re-start of the system after the frozen charge is detected.

Revolutionary Drive Controller for Gearless Mills

The Cycloconverter is a frequency changer which converts a poly-phase voltage with the frequency f1 into a single or poly-phase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from 0.3 Hz up to about 6 Hz. Energy can be transferred in either direction directly without a DC link. Consequently, the Cycloconverter is classified in the group of line …

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