drives
| Motor Power Measurement and Efficiency Diagram
Grinding circuit power is commonly used as a defining parameter in circuit design and analysis. However, the circuit power can be defined at a number of points, and depending upon the use of the power, different system losses must be applied to the power reported. Further, different comminution models report power measured at different locations.
[↑ read less ↑] [download]
Grinding circuit power is commonly used as a defining parameter in circuit design and analysis. However, the c...[↓ read more ↓] [download]
| Alex Doll | |
drives
| Choosing the Right Motors for your Mills
Slide presentation providing an overview of the process for selection motors for grinding mills. Motors are selected based on "mill overload" conditions that are more rigorous than the mill process conditions.
(Presented at Procemin 2010, Santiago, Chile)
[↑ read less ↑] [download]
Slide presentation providing an overview of the process for selection motors for grinding mills. Motors are se...[↓ read more ↓] [download]
| Alex Doll & Derek Barratt | |
drives
| The engineering and process effects of choosing a motor design speed
Many grinding mill owners choose a variable speed drive for their mill to cope with variations in ore hardness, plant throughput and other process considerations. Two important engineering decisions that owners must make before purchasing a variable speed drive system are the selection of the motor nominal design speed and the motor maximum speed.
The owner's choice of the knee point (motor rated speed) coupled with the owner's choice of the motor rated power define the rated torque of a motor. The electrical designers of motors use this rated torque to fix the size of the motor components. The price of a motor depends on the rated torque of the motor (more-so than the motor rated power and diameter), so for large mills a slight increase of the motor rated speed can result in substantial price savings. Operating at higher mill speeds can reduce operating costs by permitting operation at lower ball charges for a given mill power draw.
(Presented at SAG 2015, Vancouver, Canada)
[↑ read less ↑] [download]
Many grinding mill owners choose a variable speed drive for their mill to cope with variations in ore hardness...[↓ read more ↓] [download]
| Alex Doll & Kurt Tischler | |