Motor Building Info-- 권선 관련 계산기 모음

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Motor Building Info

Tips and "How -To"s are on the FAQ page

Some useful information & tools for
designing and building outrunner motors

Winding Diagrams
CD-ROM The 'standard' Star diagram for 9-tooth stators & 12 magnets
Star (Wye) Connection Similar to the Star diagram above for 9-tooth stators & 12 magnets
Delta Connection The winding leads connected together in pairs to create a Delta connection
LRK For 12-teeth stators (10 or 14 magnets)
Distributed LRK For 12-teeth stators (10 or 14 magnets)
Winding Scheme Calculator For other combinations of stator teeth & magnets
Winding Scheme Table A very handy table showing winding schemes for teeth/pole combinations

Calculators, Spreadsheets & Tables
Wire Size Calculator (xls)
Airgap calculator for outrunner motors (html)
Magnet Coverage Spreadsheet (xls)
Wire Conversion Table AWG to Metric
Wire XS (cross sectional) Areas

DELTA vs STAR (WYE)

For the same number of turns and wire thickness:

DELTA gives 1.73 higher power and amp draw than STAR

DELTA Kv (RPM)  = 1.73 higher than STAR Kv while the Kt (torque) = 1.73 lower

With a STAR connection, 1.732 less turns need to be wound to get the same power (and Kv) as with DELTA

In case you're wondering: 1.73 = sqrt(3)

Tutorials
How to wind a typical CD-ROM motor This is the winding instructions for the Apex Mini300 motor, but winding a CD-ROM motor is exactly the same
ESC Max. RPM Limits Brushless speed controllers (ESC뭩) have maximum RPM limits that they can drive motors at. See this PDF file.
How to determine the Kv of a motor Method 1 (Power drill method) - quick and dirty method 1. Drive the motor with a power drill. 2. Measure RPM and voltage generated. 3. Kv = RPM / voltage   (also see Method 3) - - - - - - - - - Method 2 (Running the motor without a load) This method is not very accurate with brushless motors, because different ESC's will give slightly different results.  1. Run the motor without load at full throttle at various input voltages and measure the RPM and controller input voltage. 2. You can measure the no-load RPM by marking two stripes on the bell with an indelible pen. Then shine a torch on the rotating bell and tach the reflected light. 3. To find Kv either: a) Graph RPM vs Voltage, the slope of the line is Kv b) For each voltage divide RPM by voltage, and average your results. Theoretically, a) is more accurate. - - - - - - - - - Method 3 (Colin Dedman's formula) - this is my favourite method 1. Drive the motor with a drill press. 2. Measure RPM and voltage generated (by one phase). 3. Kv = RPM / (volts x 1.41 x 0.95) - - - - - - - - - Method 4 (Louis Fourdan's formula) 1. Run the motor no-load at full throttle at voltage V for a RPM in the good range. 2. Measure the no-load RPM and current (Io). 3. Find the internal resistance of the motor in ohms. It can be measured using the Kelvin (4-wire) method or taken from the specifications supplied by the manufacturer (some risk of error). 4. Kv = RPM / (volts - amps x resistance). 5. It's better to measure at 2 different voltages and average the results.

I post as Skylar on RCGroups.com
and also on LRK-Torquemax