Every step of the way, from the mine to the finished product, variable frequency drives (VFDs) are used to smoothly start large motors and continuously adjust the speed as required by the machine or process. Induction and synchronous motors driving excavators, conveyors,mills, fans, and pumps use VFDs to provide high power and speed control, as well as generate significant associated energy and maintenance savings.
• Large draglines and shovels require drives to provide high power to all the motors running the machine with controlled torque and speed.
• Long conveyors require drives for starting and running, in particular to provide controlled starting torque to avoid belt slip, and the ability to adjust speed to match processing needs.
• Inomax ACS series VFD also well-suited for mine hoist applications.
• Drives are useful in soft starting large mill motors. Motor life is extended by eliminating inrush currents. Low currents at start also benefit the power delivery system by reducing voltage dips.
Grinding mills are crucial to mineral processing operations. As lower quality ore bodies are tapped, the tonnage processed per ounce of salable material will increase. This degradation in ore quality requires more power in the mill circuit, meaning larger motors and drives. Synchronous, squirrel cage induction, and wound rotor motors may be a good choice depending on the needs of the individual project. Variable frequency drives (VFD) can be paired with the motors for added benefits.
Benefits of Inomax Variable Speed Drive for your mining project
1,Power factor correction. By supplying leading VARs, regenerative drives can help correct poor plant power factor. This compensation can eliminate the need for expensive capacitor banks.
2,Speed control for added process efficiency. As ore bodies change, a variable speed mill will enable operators to adjust with changing conditions to maximize efficiency
3,Smooth starting on a weak power system. VFDs can eliminate voltage dip and other power quality problems associated with starting large motors across the line.
4,Inomax VFDs also provide full torque immediately for difficult loaded starting conditions motor coordination and load sharing for dual pinion systems. Large dual pinion mills need coordinated operation between the two driving motors to maximize gear and mill life.
5, For Induction motors, a VFD will compensate for poor power factor resulting from the motor operation.
Inomax regenerative drive family operates near unity power factor over a wide speed range. Multi-pulse front ends also eliminate concerns over harmonic content by performing better than IEEE 519 requirements.
Inomax regenerative drives are capable of operating a motor while simultaneously providing leading VARs back to the power system to counteract the lagging power factor caused by other inductive loads. This drive makes it possible to have variable speed operation and the leading power factor benefit from a synchronous motor.
Your message must be between 20-3,000 characters!
