motor

  1. mikeatron

    single phase motor reversing itself

    evening all ive got a single phase AC fan motor running normally however occasionally on start up it starts in reverse. i have 4 no fans, and this is happening to 2 occasionally. now these are in a fresh air chambers and i was starting to think that the airs blowing over the fans causing reverse...
  2. B

    Scooter Dc motor windings

    I have a 24 volt 350 watt scooter motor that need rewound. The specs say 3000 rpm no load. Does anyone know how many turns are on each coil?
  3. Lucien Nunes

    Motor cable - style question

    I'm about to replace the cable from a starter to an existing 2hp 3-phase 3-wire motor adjacent. The motor is rigidly bolted to a bed and has a direct shaft coupling, i.e. it is not on slide rails. Normally, I would use stranded singles in steel conduit with a flexible conduit link to the motor...
  4. Rockingit

    Motor maths - this makes no sense

    I've got a large USA artist music tour starting soon across Europe so we're having to sort out lots of reducer transformers etc, no big deal. But this has me stumped.... A USA manufacturer of a moving platform is requesting a 208v transformer @ 30A for the platform, but having doubled checked...
  5. jolb72

    black screen when fridge motor or heater starts

    Hi there I’m looking for some help as I have what seems to be an electrical issue. It seems to relate to my computer PC, the fridge freezer in my kitchen and my electrical heater. My computer PC tower is connected to my smart TV so I can use my TV as a PC monitor as well as a TV. The problem...
  6. i=p/u

    Single phase motor humming and heating up.

    Hi, morning EF. I was looking at a single phase motor yesterday attached to hydraulic pump for cardboard bailing machine that seems to be temerpemental with stop and starting and making humming sound. I checked the contactor was working first and voltage was going to motor, I clamped the cable...
  7. C

    How to wire an instant reversing motor

    I need some advice on how to wire this motor please! Its for a large clothing conveyor . 120 volt power . Its an instant reversing motor, controlling the direction with a dpdt toggle switch and a separate forward and reverse contactor. Thanks for any advice!
  8. M-B-Electrical-Services

    Recommended reading for motor control circuits

    Hi all. Just a quick one really. Some of my work has started to creep into the industrial sector and, as such, I'll need to do a bit of research in order for me to be able to fulfil my client's needs. The specific sector is Fire Sprinkler Systems so it'll be single/poly phase compressors...
  9. P

    What purpose is a capacitor in a motor circuit?

    So basically, if I wanted to increase the voltage across say a motor winding I would need to add a capacitor in parallel?
  10. bigspark17

    Ramp up down switch single phase motor

    Weired one. Looking for info or past experiences. Called to a garage very old ramp 40+ yrs old not working. Very old switcc looks like its burnt out, so before i take on finding a replacement i wanted to make sure motor ok. So bypassed up down switch and turned on isolator. (Single phase motor)...
  11. S

    Motor options for electric tug

    Hi Everyone I'm sorry if this is not in the right area. I am building my own small house, I need some help moving materials around the site, I like the electric tug type design in the pic attached. I am able to design and fabricate my own custom version. I want a off the shelf low torque...
  12. R

    motor overload for am2 need help!!!!

    Hi everyone, I’m doing my am2 and can’t seem to find a definite calculation to working out the overload this equation I = P/V/1.73/0.8 has popped up but not sure if it is correct
  13. L

    3Phase Motor breaker - overload schematic

    Hi all, I recently bought a CNC router and dust collector and need to connect it to my 3x380v+N power source. I want the CNC router connected to the under/over voltage protection and the motor also connected to the overload protection. Can someone please check if I connect the machines as in my...
  14. dlt27

    Motor and inverter problems

    Hi all, and thanks in advance for any help that can be given. I had a call out to a factory the other day to connect a new motor the maintenance guy had installed, he said the old one had given up. When I got there I connected it up, and it ran for a bit then stopped. After questioning the guy...
  15. Y

    Motor failure in vvfd application

    we are using two motors 93KW 740Rpm 50hz class H motor for a spray pump application also the pump parameters are 2500m3/hr,suction 400mm,delivery 300mm required motor 96Kw,rpm 740 .At first we used star delta starters for the motors, it went on smooth operation taken load upto 145A. Then we...
  16. J

    gG fuses and motor rated

    if I have a 20amp gG fuses and a 20M25 the continuous rating is the same but would the 20M25 behave more like a 25 amp fuse under earth fault and require a smaller ZS to operate in the same time as the gG fuse?
  17. C

    Help understanding AC motor diagram please

    hi can I anyone help me understand wiring one of these l, also what capacitor needed. I want to use with a speed controller. To be used on DIY reeling machine Any other tips thanks in advance.
  18. M

    Star delta motor overload

    Hi I got called out to a faulty star delta starter on an old Stenner band saw Monday (was getting stuck in star and blow fuses) - So I ordered a new one to suit the 22kw 400v motor having calculated the overload to be 22.04A going by the plated current saying 38A. 38*0.58 Fitted it all today but...
  19. T

    Motor Controls Challenge

    I"m a student learning motor controls and created a challenge for myself but am stuck. Here is the challenge: Challenge 1 A) Using a blower (compressed air) set to a min level so that it would keep the light bulb from turning on. No air or falls below the min level, and fail the light comes...
  20. N

    3 Phase Inverter Motor Vibration But Not Spin

    Dear All, My tool Carousel crashed last night and when I tried to initialize the Carousel, the Motor just vibrating (shake hard) but not spin. I am not sure if Break, Encoder or Resolver cause the issue. Please advise. Thanks, David

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