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  1. petronila

    How many hp or kW

    Dear All Please see attached picture. No data for hp or amps only volts, frequency and LRA any idea of the power rating? Thanks Petronila https://files.engineering.com/getfile.aspx?folder=0c8c55a3-c8a2-4f90-97d2-52a1d5af9f9c&file=York.jpg
  2. petronila

    Fuji Hirex 80 AVR Manual

    Hello Drivesrock, I believe you can try contacting a distibutor. See contact details below: info@alangstore.com or WhatsApp: +918264322525 Best Regards Petronila
  3. petronila

    motor rewinding from 480v to 575v

    Just note if the motor is redesigned to 575 V, the original nameplate should be replaced: 1 hp, 575 V, 1.55 A. Also, if the core dimensions allows, the rewinding give you the opportunity to increase the power output. Even though this is a simple redesign, for avoiding early damage of the new...
  4. petronila

    Induction Motor Oil Sump Heater Connection

    NomadicOwl, What Gr8blue is expaining is correct. However, regarding the space heaters connection just note the 120 V is a parallel connection (4 resistance connected in parallel)and the equivalent resistance is R/4; for 240 V connection the equivalent resistance is R (resistances connected in...
  5. petronila

    Want to rewind motor (single phase 220v 50 hz) into (single phase 220v 60 hz)

    Waross The problem with the centrifugal switch is real and it is a factor. You can not grant the Centrifugal Switch will works proper for the new speed. Adding a boost transformer is more expensive beceause you will need to size the transformer at leat 3 times the power of the motor and if this...
  6. petronila

    Want to rewind motor (single phase 220v 50 hz) into (single phase 220v 60 hz)

    nsalhieh, There are some important factor to consider due to incresing the RPM will increase the demanded power from pumps applications up to 1.7 tiems due to affinity laws thus even if you can redesign the winding from 50 Hz to 60 Hz you should trim the pump impeller. However, some of this...
  7. petronila

    Flexible damper winding jumpers

    Dear All, I have seen some OEM use flexible jumpers for connecting the damper winding of the synchronous motors/generators (see attached pictures). I would like to know your inputs of what should be the justification for such design. Thanks in advance Petronila...
  8. petronila

    Concentric to Lap Winding Conversion

    Zlatkodo, "How can the motor be more powerful when the number of turns per phase is increased?: It is because the Airgap density is increasing due to the interaction of the CF reduction and number of turns, thus the torque increases; at the same RPM the motor will be stronger. You will note...
  9. petronila

    Concentric to Lap Winding Conversion

    Hi Pete, Please see the attached Table. Mutu "For 12 turns (N in the table) single layer concentric with those pitches, equivalent double layer will have 7 turns with 1-19 coil span": That´s the reason why you should not use the 1-19 pitch because you will drop off the wire area and will be...
  10. petronila

    Concentric to Lap Winding Conversion

    Dear all, Converting to lap this concentric winding will have very few reasonable options available, rougly speaking about the AC motor redesign the key is to keep the magnetic densities in the airgap, back iron, and tooth in +/- 2 %. Normally the main guidance is the airgap density that varies...
  11. petronila

    Two speed motor connections

    Hi Wba1, Motor are connected in a Dahlander variable torque connection. Usually, for this connection, the 2 speed power output ratio is 1/4 that is, High speed power rating is 4 times the lower speed power rating. See attached file. Best Regards...
  12. petronila

    "New" starting method of 3-phase motors

    Dear All, These conection is also used for running motors delta rated @ 460 V at 575 V with a 15 % torque reduction. See the technical article: A closer look at winding conversions by reconnection. Regards Petronila
  13. petronila

    "New" starting method of 3-phase motors

    Hi Zlatkodo, What you are describing is not a starting method intended for reducing the inrush current this starting method is used for increasing the torque during the start, considering the rated current is Delta the motor will be starting as a "2Y connection" and the inrush current will be...
  14. petronila

    32-pole motor winding with 96 slots

    Dear All, This one should be a small motor so harmonics can be handled. It is possible to redesign to lap winding but with two different coils per slot you will need to add a separator and maybe there is not enough room in the slot for it. Even though the preferred pitch should be 1-4 the...
  15. petronila

    DC Motor leads Chart

    Dear All, Looking for a lead chart for DC motors based on Amp and temperature rating. Thanks in advance Petronila
  16. petronila

    Motor "type"

    Tmoose, The Type is a designation that belongs to the manufacturer itself for its own production control and it is not a factor to replace a motor. Althoug the name plate is showing all electric and mechanical parameters of the old motor there are at least two important considerations for...
  17. petronila

    Thermal protection devices fror stator windings

    Dear All, I would like to receive your inputs about how calculate/select this types of devices (thermistors, RTDs,thermocouples, etc.) based on insulation class of the stator windings. Thanks and Regards Petronila
  18. petronila

    P.A.M Winding Diagram 6 & 10 pole 90 Slots

    Dear All, I am looking for a 6 & 10 pole P.A.M Internal Connection Diagram. 90 Slots Thanks Petronila
  19. petronila

    Lead Chart for DC Machines

    Dear all, Some lead manufacturers provide tables with the ampacity chart for electric motors that have been used mainly for AC machines but what about DC Machines? Does someone can share an ampacity chart showing the led size for DC Machines? Thanks Petronila
  20. petronila

    COMPRESSOR MOTOR ALARM

    Hi oosani, You can start with 10 degrees below the insulation class temperature for the alarm and the temperature of the insulation class for setting the trip. That is if the motor is rated insulation Class F you should use 145°C for the alarm and 155°C for the trip. Once the motor is in...

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