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  1. Minder

    how to test optocoupler using multimeter?

    If it is the style where the base has a pin, check with the method usually used on the meter diode range. From base to C & E with reversing polarity of the meter. M.
  2. Minder

    Where to find Single Phase Brushless DC Motor, or way of conversion

    You need to build a driver, there are some dedicated IC's for this made originally by Motorola MC33030 etc and a few others. You either need hall effect or sense current on power up and do a slight exercise of the motor to find the position of rotor. If you go the RC route, there are a few DIY...
  3. Minder

    Help with connecting&controlling THK kr20 Linear Actuator

    To size the stepper motor controller you will need to find out if it is Bi-polar or uni-polar. and motor characteristics, current/voltage etc. If you can find a driver a simple speed control can be made with a 555 bi-stable oscillator, there are many designs out there via Google. M.
  4. Minder

    Where to find Single Phase Brushless DC Motor, or way of conversion

    You change the rotation or direction of the energized stator fields. M.
  5. Minder

    MOSFET to replace a relay

    Look in the IR IRL series, the IRLZ44S for e.g. is 28milli ohm. logic gate. Max
  6. Minder

    Where to find Single Phase Brushless DC Motor, or way of conversion

    Although a BLDC motor is identical to a 3 phase PM motor it is reversed by changing the switching direction of the stator coils, of which only two of the three winding are switched at any one time. IOW you require 6 switching devices not an H bridge, DC brushed motors use these method. If you...
  7. Minder

    PCB for Dishwasher repair

    I would also check any valves or motors (pumps etc). They used to be simple AC motors but things have gone a little exotic in recent years so the motor technology might not lend itself to easy testing. M.
  8. Minder

    PCB for Dishwasher repair

    Looks like it might have a switching power supply, if so these are prone to fail in the power semi area. It is very seldom the very small SMT devices fail, apart from the devices mentioned, power resistors and relays are high on the list. SMPS power supplies can be tricky to fix, I have even...
  9. Minder

    12V DC Motor (RS-550PC-8516) had some problem

    The max suggested for that motor is 9.6vdc if you need 12v operation you need the VC version good for 14.4v. M.
  10. Minder

    90v/100a DC Power Supply

    If you don't yet know the motor load demand you may be oversizing the application. Building either a BLDC or a VFD of that size is not a trivial task. Many with extensive experience have struggled with the task. About the most value for a VFD is the Hitachi, There is the Chinese Hunayang, but...
  11. Minder

    Schematic capture software recommendation

    Kicad does it for me If no board layout and Gerber needed then for a simple schematic only there is Diagram Design and TinyCad. M.
  12. Minder

    90v/100a DC Power Supply

    From what you have said so far it seems like it is an academic exercise, if so and if you have limited experience resources, I can see it being a very long project, it depends on when and how you need to complete the project. If considering off the shelf solution at all the VFD may be a...
  13. Minder

    90v/100a DC Power Supply

    I am wondering why you passed up the opportunity on using phase vector VFD's and 3 phase motors on 240v 1ph. If by going to BLDC is because of positioning, then you would need some kind of feedback element such as encoder and controller. If just velocity control I would have thought VFD's would...
  14. Minder

    Help with connecting&controlling THK kr20 Linear Actuator

    All the sites that sell them appear to either sell with various manf, stepper motors or with no motor at all, I suspect that these are sold initially without motor and customized by the end user etc. OP, if the motor does not appear to have any brushes and shows more than 2 conductors, it is...
  15. Minder

    Help with connecting&controlling THK kr20 Linear Actuator

    Without the manuf. instructions you may have to do some reverse engineering, I would think you will have two conductors for the motor, the others being overtravel limits, could be hall sensors. It should be relatively easy to trace everything out if you have a meter. The speed will depend on...
  16. Minder

    90v/100a DC Power Supply

    Seems a rather ambitious project to build BLDC motors, especially of that power rating, do you have a source of rare earth magnets for the rotor? Or are these going to be outrunners like the Fischer-Paykel. M.
  17. Minder

    90v/100a DC Power Supply

    90vdc: so i assume you are using DC brushed motors? They are fairly large current rating for a 90v motor, do you have them yet? For 90vdc you would need around a 65vac source, if a regular linear supply. Are the motors going to be drawing maximum current simultaneously? The cheapest way would...
  18. Minder

    Toroidal Transformer

    Toroidal transformers are fairly rugged devices, and if there was a problem you most likely would have seen a heating problem with it. I suggest taking it in to any radio/tv/electronic repair shop, they should quickly be able to tell you if there is input and output of the transformer. They...
  19. Minder

    Can anyone here help me identify this capacitor?

    DigiKey stock this type. M.
  20. Minder

    50Hz sine wave

    ELM446. https://www.google.ca/search?q=ic+elm446&ie=utf-8&oe=utf-8&gws_rd=cr&ei=M4vPV4udOZ2zjwSWoLrgBw M.
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