Slots In Motor
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Question is ⇒ In a 3-phase induction motor, the stator slots are, Options are ⇒ (A) equal to rotor slots., (B) exact multiple of rotor slots., (C) not exact multiple of rotor slots., (D) none of the above., (E), Leave your comments or Download question paper. Bonus Spins will be issued per member upon first qualifying deopsit, to be used on Starburst slot only. You will get the 25 bonus spins only if you deposit £25 or more. The maximum Bonus available to you Semi Closed Slots In Induction Motor will be the equivalent to.
Slots in motor are meant for winding around them. The lamination section surrounded by a coil forms a pole for motor. Number of such poles are decided by the windings, which in turm decide motor RPM and other characteristics. 4-pole 3-phase motor should have number of stator slots divisible by 4x3=12. If we were looking at the spectrum without knowledge of the physical construction, we could have deduced that 48x harmonics could be stator slot pass frequency but 40x and 46x probably wouldn’t be stator slot pass frequency.
Three new motors have arrived from Slot Car Corner for a quick testing. Each one of them have been chosen to fit a specific need for enthusiasts along with being easy on the budget.
Motor test results are listed by the average of 5 motors. The data provided should give you a decent glimpse into each one and aid you in your next motor choice.
BEST ADVICE: Test yourself.
At the low cost, the fastest and most accurate conclusion will come from your own testing. These are my findings based on our home track and simple test equipment. With the wide variety of tracks and test methods out there, only yours will give you the data you truly need.
Equipment:
I have a simple RPM test bench using a common laser tachometer.
Power is from an after-market adjustable supply.
An additional supply combined with a standard multi-meter is used for additional accuracy.
“JAWS 17.5K”
FK-180 Long Can Type (NC-5) Configuration
Average based on 5 motorsRPM’s (Tested @ 12 VDC)TorqueAMP Draw (No Load @ 12 VDC)Shaft DataNotes*18,450 (positive)
*17,500 (negative/reverse)270 g/cm 0.15 7.50 MM
(Length) Tapped Screw Mounts
This motor is not a neutral timed motor.
A motor with neutral timing means the motor will spin at roughly the same RMP’s regardless of how you hook it up (wire locations at motor tables). This motor has slightly advanced timing. This means that it has different RPMs depending on how you hook it up. In generic bench testing, hooking the red (positive) to the marked red side of the motor produces about 950 RPM more than the printed specifications.
Some of you might take advantage of this. It allows you to choose the speed you desire just by swapping the lead wires at either the motor or at the guide.
I wanted the LOWER end of this range. And the performance was just what I was hoping for. I wanted a motor that could tame my Sideways Group 5 models a little, without the major budget impact I have with the NSR Baby King. My track testing told me mission accomplished.
I installed this motor into one of my Sideways Porsche models. The motor shaft is a few thousandths longer than the Flat 6, but did not require any sanding/trimming.
Some motors just do not have a very smooth low end (low speed) feel to them no matter what you do. This motor just has that smoothness I prefer. It isn’t a weak motor my any means as it still has plenty of punch as well as very crisp braking action.
“GATOR 18K”
FC-130 “Standard” Can Type (Scalextric) Configuration
Endbell Drive – Splined ShaftRPM’s (Tested @ 12 VDC)Torque*Amp Draw (No Load @ 12 VDC)Shaft DataNotes 21,600105 g/cm .10Endbell Drive
Splined Shaft
9.75 MM (L) *1
This was the “surprise” in the group. I was not involved with prototype testing of this one so I had no idea what to expect. The testing went very well. The motor is very close in performance to the stock motors found in Scalextric models and should offer you a decent option for replacement.
As far as the rating goes, well that’s a whole different story. This really isn’t an 18K motor, but neither is the standard motor from Scalextric. However, Scalextric lists them as such in some of their published technical data. Some groups use this published data to set rules for legal motors. Given this fact, listing the Gator as 18K allows it to be included. It is after all, literally the same motor.
For advanced enthusiasts? Racers that do not use any such rule?
Here is your data. Refer and share often
Question is ⇒ In a 3-phase induction motor, the stator slots are, Options are ⇒ (A) equal to rotor slots., (B) exact multiple of rotor slots., (C) not exact multiple of rotor slots., (D) none of the above., (E), Leave your comments or Download question paper. Bonus Spins will be issued per member upon first qualifying deopsit, to be used on Starburst slot only. You will get the 25 bonus spins only if you deposit £25 or more. The maximum Bonus available to you Semi Closed Slots In Induction Motor will be the equivalent to.
Slots in motor are meant for winding around them. The lamination section surrounded by a coil forms a pole for motor. Number of such poles are decided by the windings, which in turm decide motor RPM and other characteristics. 4-pole 3-phase motor should have number of stator slots divisible by 4x3=12. If we were looking at the spectrum without knowledge of the physical construction, we could have deduced that 48x harmonics could be stator slot pass frequency but 40x and 46x probably wouldn’t be stator slot pass frequency.
Three new motors have arrived from Slot Car Corner for a quick testing. Each one of them have been chosen to fit a specific need for enthusiasts along with being easy on the budget.
Motor test results are listed by the average of 5 motors. The data provided should give you a decent glimpse into each one and aid you in your next motor choice.
BEST ADVICE: Test yourself.
At the low cost, the fastest and most accurate conclusion will come from your own testing. These are my findings based on our home track and simple test equipment. With the wide variety of tracks and test methods out there, only yours will give you the data you truly need.
Equipment:
I have a simple RPM test bench using a common laser tachometer.
Power is from an after-market adjustable supply.
An additional supply combined with a standard multi-meter is used for additional accuracy.
“JAWS 17.5K”
FK-180 Long Can Type (NC-5) Configuration
Average based on 5 motorsRPM’s (Tested @ 12 VDC)TorqueAMP Draw (No Load @ 12 VDC)Shaft DataNotes*18,450 (positive)
*17,500 (negative/reverse)270 g/cm 0.15 7.50 MM
(Length) Tapped Screw Mounts
This motor is not a neutral timed motor.
A motor with neutral timing means the motor will spin at roughly the same RMP’s regardless of how you hook it up (wire locations at motor tables). This motor has slightly advanced timing. This means that it has different RPMs depending on how you hook it up. In generic bench testing, hooking the red (positive) to the marked red side of the motor produces about 950 RPM more than the printed specifications.
Some of you might take advantage of this. It allows you to choose the speed you desire just by swapping the lead wires at either the motor or at the guide.
I wanted the LOWER end of this range. And the performance was just what I was hoping for. I wanted a motor that could tame my Sideways Group 5 models a little, without the major budget impact I have with the NSR Baby King. My track testing told me mission accomplished.
I installed this motor into one of my Sideways Porsche models. The motor shaft is a few thousandths longer than the Flat 6, but did not require any sanding/trimming.
Some motors just do not have a very smooth low end (low speed) feel to them no matter what you do. This motor just has that smoothness I prefer. It isn’t a weak motor my any means as it still has plenty of punch as well as very crisp braking action.
“GATOR 18K”
FC-130 “Standard” Can Type (Scalextric) Configuration
Endbell Drive – Splined ShaftRPM’s (Tested @ 12 VDC)Torque*Amp Draw (No Load @ 12 VDC)Shaft DataNotes 21,600105 g/cm .10Endbell Drive
Splined Shaft
9.75 MM (L) *1
This was the “surprise” in the group. I was not involved with prototype testing of this one so I had no idea what to expect. The testing went very well. The motor is very close in performance to the stock motors found in Scalextric models and should offer you a decent option for replacement.
As far as the rating goes, well that’s a whole different story. This really isn’t an 18K motor, but neither is the standard motor from Scalextric. However, Scalextric lists them as such in some of their published technical data. Some groups use this published data to set rules for legal motors. Given this fact, listing the Gator as 18K allows it to be included. It is after all, literally the same motor.
For advanced enthusiasts? Racers that do not use any such rule?
Here is your data. Refer and share often
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