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Power Factor correction, Motor starters and Variable frequency drives for induction motors.
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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. Busbar Calculations Brushless
DC Motors Compound
DC Motors
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? Genset Sizing An introductory paper on the sizing of engines and alternators when used for motor starting supplies. GSM Alarm GSM Alarm relays can be used to provide alarm text messages from eight channel monitoring and single channel control via text messaging. GSM Control GSM Control relays can be used to provide basic two channel monitoring and control via text messaging. Harmonic Filters Harmonic filters are used to reduce the harmonics generated by the input rectifier of VFDs. 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. Invertek Drives Now available in New Zealand. |
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. Logic relays Programmable Logic relays are an easy way to create a flexible and low cost control system using minimum components. 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. 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. 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. PID Control An introductory paper on PID control. Horner PLC Horner OCS are industrial PLCs with an integrated graphical HMI panel. 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. Pressure Transducers Pressure transducers are used to measure the pressure/vacuum of liquids and gasses and convert this to an electrical signal which is typically 4-20mA or 0-5V. Pressure transducers are commonly used in pump control systems in conjunction with a VFD to regulate the pressure, but can also be used in conjunction with appropriate logic to provide under and over pressure protection. Secure Password Store Program for saving encrypted passwords and registration data. Includes a free random password generator.
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Series DC Motors An introductory paper on series DC Motors which comprise an armature winding in series with the field windings. Schrage
Motors. 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. Smart relays, or Logic relays, are essentially a simplified PLC with limited functionality. They are designed to replace a number of standard electromechanical and electronic relays as found in machine automation where the task does not require a full PLC. 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!
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. VFDs and Energy Saving Using VFDs to save energy. VFDs and EDM Using VFDs and reducing EDM (Electrical Discharge Machining) bearing damage. |
Contact Information Telephone
++64 27 436 3067
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| Visits since 6 Aug 2002
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© L M Photonics Ltd | P.O. Box 13 076, Christchurch, New Zealand | phone : (NZ) +64 274 363 067