motors | Page 4

motors

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  1. D

    Three phase motors

    I'm studying my HNC and I'm struggling a bit with motors, does anybody know much about three phase induction motors Cheers, Davey
  2. R

    Power consumption for a 3 phase connection

    Sir Can you pls what is Power consumption for a 3 phase connection compared to a single phase Thanking you, Sudesh
  3. R

    3 phase motor rating.

    Firstly, I'm not doing this, I'm getting someone else to. I'm just interested. I have a machine arriving which has a largish motor, the plate on it is the one below. The horsepower is 0.6 but the current stated is 2.4A. This to me doesn't work out, is this the in-rush current? The motor is...
  4. A

    tripping RCD when I use motors

    Hi, I cannot use any motor in my house, vacuum cleaner etc. the RCD trips all the time. I have had 3 electricians in, one replaced my whole board, still no difference. they have tested all plugs, everything seems to be in order. no problems with the lights I do have 1 plug in the house that I...
  5. B

    3phase motors

    Hi all Has anyone got any decent links for notes on 3 phase and single please motors?? All kinds? Cheers
  6. P

    3 phase cable calc and fuse sizes for motors

    Hi am currently employed as testing and inspection on a industrial site just wondered if you could give me some advise What it is I got a 110 kw motor 180 amp 100 m run full load now I got a 75 mm cable supplying it . I have checked table 4d4a in the regs as it is 3 core armoured . Ref method E...
  7. D

    Fault finding single phase motors

    Ok got called in regards to somebody's electrica gate not working. Power supply all seems good. After removing the motor i attempted to test the windings. ( i really havent done much with motors) the motor is single phase. Has a N , 2 feeds/supplys/windings. ? is this one :- Electric Gates...
  8. D

    Rcd selection

    I am rewiring a 2 bedroom outhouse which I've been made aware will include a supply to a shed. I'm told the shed will we used as a work shop using equipment such as rotary grinders, motors, welding equipment and other power tools. I know welding equipment can produces supply distortion's a I.e...
  9. A

    Motors

    I know little about motors, but ive just been told by a guy that i used to work with that if one of the phases is down on a 3-phase motor, you can link it out to a working phase inside the motor and the motor will run at half speed... This dosent sound right to me but like i said ive not really...
  10. J

    3 Phase Motors Speed Control

    Hi, Does anybody know of any alternative to governing the speed of a 3 phase motor than a frequency inverter? Thanks in advance, Jamie
  11. M

    overheating motors

    Can a motor overheat and short to earth if it is having to work to hard?There is no overload but the motor is protected by thermistors and a thermistor relay which cuts out on occasions. Its an intermittent fault but the Engineers that have watched the circuit say it trips the Main C/B. On a...
  12. I

    DC Motors

    Well expect many threads like this as i would like to know the in's and out's of them not just the crash course on what u need to know and pffff doesn't come up much so we won't go into detail. What would i like to know about them you may ask :P, well everything if possible within reason as i'm...
  13. S

    Display Cabinet Motors?

    Im after some replacement motors such as these -> Idea Showcases Motor , Display Cabinet Accessories Anyone know of any suppliers? Thanks
  14. O

    Practical differences between "Baker" testing and LEAP analysis?

    Does anyone have any experience with the validity of "Baker" Testing of a wound electrical device as opposed to LEAP anaysis? I have a conveyor magnet that is not going too well by the oil testing, and have been offered "Baker" testing by an NDT firm (can we use company names here?) but I have...
  15. J

    any motors experts on here

    hi guys currently doing some course work time served spark 4years. i have a theory question regarging squirrel cage motors and induction wound motor and the 2 differences in their construction, mabye im being blind in the notes but the answers i keep trying to pluck from them allways seem to...
  16. telectrix

    quick rule of thumb, 3 phase current

    now this is not exact, but comes close. say you have a 3 phase, 400v motor, given the kW, to get an approx. value for the current per phase, (can be done in your head), just multiply the kW x 1.5. e.g. a 20kW motor. I = 30A. ( not allowing for efficiency, pf etc. ) just to give a rough idea.
  17. W

    Anyone good with motors - for I, am poo

    Alright lads, As brief as i can - Screw auger dosing head, driven by a Carpanelli 0.37KW (1/2 HP) 3 phase 415V 1380max RPM induction motor . Under very little stress, is dosing a material into the feed heads, with a consistency of that of play doh or floury lard - soft and very pliable, can see...
  18. D

    3 Phase Motors & Control Gear

    I am wiring 3 3 phase motors, 1.1 KW each via 3 STOP/START manual starters. If one starter locks out for any reason, the others also need to close down simultaneously. I initially thought that I would have to have a relay in each starter connected in series but I've realised that won't achieve...
  19. beatboaby924y

    car trouble, anyone good with motors?

    Hi I have a 3 year old fiesta and sometimes when I turn the key to start the engine it doesn't start and makes a loud noise that sounds like the starter squeeling. The noise is similar to when you turn the key when the engine is already running and you get a loud squeel from the starter motor...
  20. K

    Voltage Optimisers.

    Has anyone come across a phase sequence fault when switching on a voltage optimiser for the first time. The system is a cheap chinese one I think with terrible instructions. Can a voltage optimiser know if your input wiring is black, grey, brown instead of Br, Bl, Gr? I ask because we don't...

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