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  • Users: Sparky2003
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  1. Sparky2003

    Brushless DC Motor

    Hi, Hope someone can advise here. I have a DC Brushless Motor controlled by a Motor Driver IC. The motor is used to drive a fan in refrigerator. There is a Current Limit and Over Temperature Protection (OTP) built into the motor driver IC. The problem is that on start-up the OTP is triggered...
  2. Sparky2003

    IC in Brushless Motor Application

    Hi - Hope someone can help. I have a IC motor driver in a brushless dc motor which rotates a fan. I have 2 type failure modes on same application with different internal circuitry - 2 different end applications. Failure 1: When I power the motor, it is stalled, there is large current been drawn...
  3. Sparky2003

    Power - Reactive Power

    Hi All - Hope you can help. I have 2 Transport Refrigeration Units. Unit 1 measures as follows: Kw: 6.59 Kva: 8.11 Kvar: 4.77 PF: 0.81 Unit 2 measures as follows: Kw: 5.28 Kva: 8.05 Kvar: 6.09 PF: 0.66 I need to advise which unit will heat cables less, or more and why. The customer in...
  4. Sparky2003

    FuseLink on Battery Control Wire

    On the Control wire from Alternator to Battery, I currently have a fuse link (14AWG)and teh Control wire is 10AWG. There is a significant voltage drop associated with the fuse link. Can anyone advise how I can reduce this resistance.
  5. Sparky2003

    Battery Qualification

    I have received a 92Ah Automotive Battery from Varta and I want to suitable qualify it for a Refrigeration unit which is driven by a Diesel Engine which is purely Automotive. Can you advise or suggest what type of tests I should perform. Thanks, Sparky
  6. Sparky2003

    Battery Specification

    I am developing a battery specification for an Automotive application which I can give to Battery suppliers and get them to advise Battery's that will meet this specification. Also within this spec, I want to deifine the tests that I the customer will perform to qualify the battery. Can I have...
  7. Sparky2003

    Battery Vibration Test

    I am currently looking at designing a Battery in a Transport Refrigeration unit application. Due to space constraints, I have to mount the battery vertically. As part of the vertical mounting, I will be doing a shaker table vibration test. How should I check the battery after the test and what...
  8. Sparky2003

    Alternator Test

    I am currently looking at qualiying an Alternator from a Vendor called Magneton. It is a 14V/37A. I am looking for guidelines on tests to be performed and measurements taken etc etc. Anything you can suggest will be helpful. Also, are there any good websites with theory on Alternators. Thanks...
  9. Sparky2003

    Motor Winding Temperature Measurement

    Can anyone explain in Detail the process for measuring motor winding tempertaure using the change in resistance method. I believe there is a formula to calculate same - hence if someone can provide and explain the formula and its parameters and also the process for taking readings. Many Thanks...
  10. Sparky2003

    Overload Relay Validation

    Hi all. Happy New year to everyone. I am in the process of changing overload relays on 15hp 3phase electric motor - reason is current relay is going end of life. Electrically the spec on the replacement is identical, however I guess I should be performing some sort of validation/verification...
  11. Sparky2003

    Laptop Purchased in US

    If I purchase a laptop in US for use in Europe - what are the areas I need to consider. What do I need to get for Voltage. Do I need to consider anything re. DVD Player. Is there anything else. Thanks.
  12. Sparky2003

    Sourcing vs Sinking Current

    Can someone explain the difference betwen sourcing and sinking current when powering components. Thanks.
  13. Sparky2003

    DC Motor Magnet Adhesive

    I am currently using a DC motor and the vendor has informed me that they will be changing the adhesive to bond the magnets to DC motor shell. I want to generate a Validation plan for this change. Anyone have suggestions on applicable tests. I was thing along lines of Life testing in operation...
  14. Sparky2003

    Mains Harness - Compliance with EU Directives.

    I currently have a mains power supply harness for an electric motor which is used on a Transport Refrigeration unit. Harness basically consists of a soft nylon hose as a conduit which carries individual 400VAC and Earth wires. THe power carrying wires are individually insulated but are loose...
  15. Sparky2003

    AC Induction Motor Theory

    Does anyone know of any good website giving free training or technical info. on the basics of AC Induction Motors. Thanks.
  16. Sparky2003

    Vibration Testing

    Does anyone know of a good website which gives good theory on Vibration testing using shaker tables etc. I will be doing some Vibration testing on an Electric Motor to simulate real life conditions, however I need to get the background to the test parameters conditions etc. What does Vibration...
  17. Sparky2003

    Single Phase Motor

    Is it possible to change the direction of a single phase motor and how do I do it?? Any help appreciated.
  18. Sparky2003

    Welding

    I need to do some welding on the frame of a refrigeration unit. The unit has a compressor driven by an Engine and also has a microprocessor controller and Battery. What do I need to disconnect when welding and what precautions should I take.
  19. Sparky2003

    AC Induction Motor Testing

    Does anyone know of any test facilities in Ireland who specialize in validation of Electrical components - primarily AC Induction Motor. Perform tests such as Winding and Bearing temp measurement, Overload and protector tests, Locked Rotor test, Staring tests @ different conditions, Insulation...
  20. Sparky2003

    AC Induction Motor - Voltage and Frequency Variance

    I am looking to perform some qualification testing on 15HP AC Induction Motors (3 phase). I need to vary the voltage from 200V up to 460V and the frequency between 50Hz and 60Hz. At the moment I am looking towards a Variac for the voltage and Generator for the frequency. Can anoyone offer some...

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