Power Factor correction, Motor starters and Variable frequency drives for induction motors.

50Hz Motors on 60Hz and 60Hz Motors on 50Hz
. You can run a 50Hz motor on 60Hz, and a 60Hz motor on 50 Hz provided you adjust the voltage and power ratings to keep the V/Hz constant.

Ezine Article Directory
 A collection of articles on many different topics.

Busbar Calculations
 Calculation of ratings for both Aluminium busbars and Copper busbars.

Brushless DC Motors
 An introduction to Brushless DC motors.

Compound DC Motors
 An introduction to Compound DC motors.

Dahlander Motors
 Dual speed Dahlander motors.

Discussion Topics
 Latest topics on LMP discussion groups.

Electrical Calculations Software  Busbar ratings, Cable ratings, Power Factor Correction calculations, Motor Starting and acceleration Curves, Enclosure Cooling, Genset sizing and numerous metric/imperial conversions.

Enclosure Ventilation  Guidelines for the correct cooling ventilation of switchboards and enclosures.

Energy Savers for Induction Motors  Energy Saving systems for Induction motors   Are they a sham?   Do they work?
There seems to be a resurgence in interest in the Nola energy saving algorithm for induction motors, with a number of manufacturers beginning to market "new" and "improved" versions of this technology.

Frequently Asked Questions  Frequently asked questions relating to motor control.

Genset Sizing  An introductory paper on the sizing of engines and alternators when used for motor starting supplies.

Guestbook  Sign our guestbook.

Induction Motor Control  A Paper on induction motor design covering many aspects of motor design and classification. Motor starting characteristics are explained. Worth a read.

Industrial IO  An introductory paper on industrial IO as applied to PLCs, and other electronic devices. Currently covering outputs only, Inputs to follow shortly.

Installing VFDs on Irrigation Pumps for minimum EMC  Suggested codes of practice for installing Variable Frequency Drives on irrigation pumps with minimum EMC problems.

LMP Technology Warehouse Technology Warehouse. A source of motor control technology including soft starters and variable speed controllers.

Induction Motor Calculations Formula for basic induction motor calculations.

Induction Motor Cogging and Crawling Induction motors will not accelerate to full speed if they either cog or crawl. This page covers the basic theory.

Motor Control Forum .  Join the Motor control on line forum to discuss motor control technology and problems with like minded experts. Post and answer questions on any aspect of motor control, starters, soft starters, variable speed drives, protection and design. NB this is independant of the email forum above.
Topics currently covered:
- Soft starters
- Variable Speed drives
- Power Factor Correction
- Motor Starting
- Motor Protection
- Energy Saving

Motor Control Mailing List  Join the Motor control email forum to discuss motor control technology and problems with like minded experts. Post and answer questions on any aspect of motor control, starters, soft starters, variable speed drives, protection and design.

Click to join ElecMotorControl

Motor Starters   A Paper on traditional Electromechanical starters including Direct On Line, Primary resistance, Autotransformer and star delta (wye delta) for induction motors illustrating how to use them and what characteristics can be expected.

News  Industry news feeds.

PID Control  An introductory paper on PID control.

Power Factor Correction  Power factor correction of A.C. Induction motors is often poorly understood and more poorly specified.

Power Factor Calculations  Power factor correction Calculations

Power Factor Controllers  Power factor correction Controllers for bulk displacement power factor correction.

Power Factor Correction for Domestic installations Power factor Correction does not save energy within domestic installations.

Secure Password Store  Program for saving encrypted passwords and registration data. Includes a free random password generator.

Series DC Motors  An introductory paper on series DC Motors which comprise an armature winding in series with the field windings.

Shareware Library
 Freeware and Shareware software Library.

Schrage Motors.
Schrage Motors are variable speed motors.

Shunt DC Motors
 An introduction to Shunt DC motors.

Single Phase Motors  Information and circuits of common single phase induction motor configurations including capacitor start and run, and induction start motors.

Software Download  Electrical Calculations software,
Atmel Programmer Software,
Energy Savings Paper,
LMFTP FTP client - Early Beta version

Slip Ring Motors  An introductory paper on slip ring motors and secondary resistance starters, their control and use.

Soft Starters .  An introductory paper on Solid State Soft Starters. - under construction!

Space Vector Modulation  An introductory paper on Space Vector Modulation Techniques for three phase inverters.

Star Delta Starters  Theory and applications of start delta (wye delta) starters.

Starting High Inertia Loads  Guidelines for selecting starter and motors for starting high inertia loads.

Stray Voltages from VFDs in Dairy Sheds  Stray voltages from incorrectly installed VFDs cause major problems with the dairy herd being milked.

VFDs and Harmonics  An introductory paper on VFDs and harmonics

Variable Speed Control  An introductory paper on Variable Speed Control. covering mechanical and electrical methods.

Variable Frequency Drives  An introductory paper on Variable Frequency Drives. This page is under construction.

VFDs and Unscreened Output Cables  Screened cables are used between the output of a VFD and the motor to reduce conducted emissions and stray voltages.

The Lighting Workshop
 An introduction to a very informative book for the keen photographer covering all aspects of natural and artificial lighting.

Contact Information

Telephone ++64 27 436 3067
FAX ++64 3 332 5220
Postal address P.O. Box 13-076, Christchurch, New Zealand

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Visits since 6 Aug 2002