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How Important is Correct Motor Shaft Alignment?

08/07/2019

There are a few of us old timers still around who would say that straight edge or string alignment is good enough. At that time and for certain applications that was actually good enough. Now we have state of the art tools that we can use to get us a near perfect shaft alignment. But do I need near perfect? What will that extra bit of time get me and is it worth the time?

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 8) Final Assembly and Installation

07/31/2019

In the final post in this 8 part case study series, you will see Todd Hatfield explain the final assembly of the 5500HP, 13,200v, synchronous motor in the clip below from a presentation given at the 2018 RPM Symposium. 

The presentation below covers:

  • Assembling the rotor to the adapter base with the stator

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 7) Adapter Base

07/29/2019

For part 7 of this series, Todd Hatfield will be explaining the process of creating the adapter base in the 2 videos below. Video one explains the engineering of the adapter base design, while the second video explains the process of mounting the stator to the adapter base.

Video 1 describes:

  • Creating a CAD drawing to ensure the adapter base design was scaled to fit into the concrete pit

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 6) Stator Redesign and Rewind

07/25/2019

Below is a 2 minute clip of an hour long presentation given by Todd Hatfield during the 2018 RPM Symposium. Part 6 of this 8 part series focuses on the redesign and rewind of the stator for the 5500HP, 13,200v, synchronous motor.  

This video will describe:
  • The new engineered stator winding design and CAD drawing

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 5) Electrical Design of Rotor

07/23/2019

In part 5 of this case study, Todd Hatfield will be reviewing the electrical design of the rotor. Below is a short 3 minute video showing the steps involved in creating the new coils for this 5500HP, 13,200v, Synchronous Motor's Rotor.

 The video below will discuss: 

  • The decision to keep the coil design and duplicate it or to come up with a new and improved design

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 4) Mechanical Design of Shaft and Rotor

07/17/2019

Below is a 10 minute segment from an hour long presentation given by Todd Hatfield. In this clip, Todd Hatfield will go over the mechanical design of the shaft and rotor and how HECO assembled it all together.

The presentation below discusses:

  • Design assessment to see how to fit a larger shaft in the rotor and re-configuration

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 3) Electrical & Mechanical Redesign Engineering

07/15/2019

In part 3 of this case study, Todd Hatfield will be discussing how HECO re-engineered the electrical and mechanical design of the surplus motor to match the 5500HP, 13,200v original motor.

This 13 minute presentation will go over:

  • On-site laser measurements using FARO technology
  • Determining challenges such as
    • How the spare motor would fit into the existing pit 

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 2) Evaluating Surplus Motor Options and Initial On-site Application Review

07/11/2019

For part two of the series, Todd Hatfield will be reviewing the dismantled surplus motor and explaining some of the on-site findings for the 5500HP , 13,200v, Synchronous Motor.

In this video segment, you will see:

  • The replacement motor's shorting ring and it's unique placement on the motor
  • Data collected on the replacement motor's stator and rotor

Case Study 5500HP, 13,200v, Synchronous Motor: (Part 1) Problem Identification & Potential Solution

07/09/2019

The video below is a segment from an hour long presentation given by Todd Hatfield, Senior Electrical Engineer at HECO - All Systems Go, at the 2018 Reliability, Process, and Maintenance (RPM) Symposium.  

This is the first of an 8 part article series that will be coming out twice a week over a 4 week period. Each post will cover different points of the case, leading up to the final assembly and installation. Be sure to check out this article on how Synchronous Motors work before starting the series!

What is an AC Synchronous Motor?

07/02/2019

Below is a 5 minute video from an hour long presentation given by Todd Hatfield, Senior Electrical Engineer at HECO - All Systems Go, during the 2018 Reliability, Process, and Maintenance (RPM) Symposium. This clip covers the basis of synchronous motors and how they differ from induction motors.

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