Evaluation of Large Grinding Mill Drives for the Cement Industry

Hoffmann, Arthur H.; Trasky, John G.

doi:10.1109/tia.1972.349738

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…Gearing limitations due to excessive torque on the gear-teeth of gears used in high power grinding mills led to the emergence of twin-motor drive systems [1,2]. One critical issue in twin-motor drive systems is that the two motors must rotate coordinately [3].…”

Section: Introductionmentioning

confidence: 99%

“…A number of patents have also been obtained which propose solution to the load share problem between two synchronous motors coupled to a common shaft [7 -10]. In this era of high power solid state electronics, the use of converters and load sharing regulators are other possible solutions [1,2,4] To the best knowledge of the authors, the system proposed in [9] has not been analytically studied, theoretically or experimentally. It is a two-motor drive system with a special stator winding arrangement, which also involves the series stator winding connections of the two motor units, and the two motor units drive a common load through pinions coupled to a speed reducing gear train.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of load sharing capability of a series-connected twin synchronous motor drive coupled to a common load shaft by gearing

Onwuka

Obe

2019

Nig. J. Tech.

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Torque limitations on gear teeth led to the use of two motors on opposite sides of the gear to drive large grinding mills. For such systems, motor overheating and rapid gear-teeth wear have been observed, especially when using synchronous motors due to load imbalance between the two motors. This paper studied a drive system consisting of two separate three-phase synchronous motors whose phase windings are split into two sections in a manner that makes them appear as six-winding machines, and then each of the resulting six windings of one motor are connected in series with those of the other motor, with no phase transposition, such that only three terminals of each motor are available to be connected to supply. The field windings are connected in parallel to the same source. Again, the motors, running on separate shafts, are connected to a common load shaft through a speed reduction gear driven through pinions. A detailed mathematical model is developed in the q-d axis, and the system is implemented on the MATLAB/SIMULINK environment. A circumferential error in the girth gear was modeled to introduce load imbalance. It is observed that despite the load imbalance, the stator currents and the load torque seen by the two motors are the same. However, a variation is observed in their rotor angles. This suggests that while the motor units inherently share the mill load equally thereby removing the possibility of motor overheating, the varying rotor angle may represent a problem for the motor shafts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of load sharing capability of a series-connected twin synchronous motor drive coupled to a common load shaft by gearing

Onwuka

Obe

2019

Nig. J. Tech.

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Evaluation of capital cost data: Drives

Woods

Anderson

1975

Can J Chem Eng

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Capital cost correlations are given for electric and gasoline motors, steam, gas and combustion‐gas driven turbines, power transmission units and power converters. Correlations available in the literature and current data are compared on a consistent basis. Thirty‐eight graphs show the relative magnitudes of the different correlations and the recommended correlation for each type of equipment is summarized in a table.

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Annual review of size reduction—1972

Snow¹

1973

Powder Technology

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Evaluation of Large Grinding Mill Drives for the Cement Industry

Cited by 7 publications

References 6 publications

Analysis of load sharing capability of a series-connected twin synchronous motor drive coupled to a common load shaft by gearing

Analysis of load sharing capability of a series-connected twin synchronous motor drive coupled to a common load shaft by gearing

Evaluation of capital cost data: Drives

Annual review of size reduction—1972

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