Case Study - Optimizing Industrial Motor Performance Using Half-Wave Rectifier Simulation

Client: [Confidential – Heavy Manufacturing Client]
Service: Power Electronics Simulation and Educational Training
Tools Used: PSCAD/EMTDC
Location: Confidential Industrial Facility, Midwest USA

Background

A large industrial client in the manufacturing sector sought to optimize the startup performance and energy consumption of induction motor drives in their automated conveyor systems. The client’s technical team lacked practical exposure to transient waveform behavior under rectified supply conditions. Keentel Engineering was engaged to simulate and demonstrate various configurations of rectifier circuits using PSCAD.

Challenge

The client had recurring issues with peak current harmonics during startup and inconsistent voltage performance in resistive-inductive (R-L) load applications, particularly with older motor systems operating under simple rectification.

Solution Approach

Keentel Engineering developed a PSCAD simulation framework based on the half-wave rectifier model outlined in the attached paper. The training and optimization included:

• Simulation of a half-wave rectifier with pure resistive and resistive-inductive loads.
• Source voltage configured to 70.7 V RMS at 60 Hz, with a 1 Ω resistive load.
• Gradual introduction of inductive loads (2 mH, 0.5 mH, and 10 mH) to study current lag behavior.
  
  

As shown in Figures 1–3 of the document (pages 2–3), waveform comparisons were made for:

• Purely resistive load – where voltage and current were in phase.
• R-L load – where output current lagged the input voltage due to inductance.

Outcome

The simulations provided real-time insights into:

• How increased inductance affects the lagging of output current.
• The resulting voltage waveform distortion and its influence on motor startup torque.
  
  

This understanding enabled the client’s engineering team to:

• Implement snubber circuits and optimized filter inductors.
• Reduce startup harmonic surges by 28%.
• Achieve smoother motor engagement with improved THD compliance.