Gear Ratio Of Each Range

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The relation between each element of the planetary gear set and the rotation speed is generally indicated in the formula:
(Z?_R +Z?_S )N?_C =Z?_R N?_R +Z?_S N?_S : (1)

Meaning of symbols
1. Z: Number of teeth
2. N: Rotation speed
3. R: Internal gear
4. S: Sun gear
5. C: Planetary carrier (pinion gear)
6. ?: Unit symbol
  
  Fig 1: Identifying Planetary Gear Components
  Courtesy of MAZDA MOTORS CORP.