2021 Electric Underground Mobile Drilling Rig.

A client developing a prototype electric underground mobile drilling rig with AC Variable Speed Drive requested services from Petro Min Engineers to provide the following:

  • Sizing and specifying bespoke components for the drive system (including DC capacitors and braking resistors).
  • Providing testing and measurement services for prototype testing. Determining steady state performance, system efficiencies, transient response.
    • DC Bus Voltage
    • Shaft RPM
    • Motor Current
    • Motor Voltage (phase to phase)
    • Generator Frequency
    • Generator Voltage (phase to phase)

Capacitors were sized and fitted, reducing the DC ripple voltage to within acceptable limits and reducing torque ripple in the system.

Figure – 1 – Drive Startup
Figure 2 – System Efficiency

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