How to choose capacitor for motors?

How to choose run capacitor for motors? 

1. C = 8 * J * S * (uF)
C: capacity, units of microfarads (uF); J: motor start winding current density, the general election 5 ~ 7A / mm2; S start winding wire cross-sectional area (mm2).

For example: Jinlong table fan motor windings after starting again around the system, measured start winding diameter is 0.17mm2, the cross-sectional area S = 0.0226mm2, J = 7A / mm2, so
C = 8 × 7 × 0.0226≈1.26uF
Actual optional parameter is 1.2uF ± 5%, voltage 500V capacitors. Also it should be noted that the value of the capacitor voltage must be higher than 400V, to prevent breakdown.

2. C = 1950 * I / U * cosφ
(I: Motor rated current; U: power supply voltage; cosφ- power factor of between 0.7 to 0.8)
For example: a single-phase motor, rated at 4.8A power is 750W how to choose its capacitance value?
C = 1950 × I / U × COSφ
= 1950 × 4.8 / 220 × 0.8≈34 (μF)
For example: seeking 140W motor rated current: I = P / U × cosφ (normal operation by capacitance compensation improves the power factor, cosφ is 0.9) I = 140/220 × 0.9≈0.7 (A)
Capacity of run capacitor: C = 1950 × 0.7 / 220 × 0.75≈4.7 (μF)

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