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Crane Electric Motor Pole Numbers

Electric motor pole numbers refer to the count of magnetic poles or windings within a motor, playing a crucial role in its performance. Common pole numbers include 2 poles, 4 poles, 6 poles, 8 poles, each having a significant influence on motor characteristics and applications.

Impact of Pole Numbers on Crane Performance:

  1. Output Power:
    • The pole number directly affects the motor's output power. By adjusting the pole number within certain volume and weight constraints, the motor's output power can be tailored. More poles result in lower magnetic field intensity and, consequently, decreased output power. Conversely, fewer poles lead to higher magnetic field intensity and increased output power.
  2. Rated Speed:
    • The motor's rated speed, the highest speed under rated voltage and load, is influenced by the pole number. More poles lead to slower magnetic field changes, resulting in a relatively lower rated speed. Conversely, fewer poles lead to faster changes and a higher rated speed.

Detailed Insights into 2, 4, 6, and 8 Pole Motors:

2-Pole Motor:

  • The simplest structure with one positive and one negative pole, the 2-pole motor features fast magnetic field changes, providing high speed and power density. Ideal for applications requiring swift operations such as household appliances, fans, and printers.

4-Pole Motor:

  • Comprising two positive and two negative poles, the 4-pole motor has a moderately slow magnetic field variation. Widely used in crane applications, particularly in the sizeable XYZ crane series with its three-in-one motor.
  • Learn more about the applications of our 4-pole motors in the hoist and trolley of European standard cranes.

6-Pole Motor:

  • Featuring three positive and three negative poles, the 6-pole motor exhibits slower magnetic field changes, offering lower speed and higher torque. Ideal for standard double-girder bridge crane motors, applicable to both lifting and trolley mechanisms.
  • Discover 6-pole motor applications in double girder overhead crane.

8-Pole Motor:

  • With four positive and four negative poles, the 8-pole motor experiences slower magnetic field changes. Suited for high-duty crane applications, such as metallurgical cranes, requiring substantial torque at lower speeds.
  • Learn more about our 8-pole motor applications in metallurgical crane.

Impact Beyond Speed and Power Density: Apart from differences in speed and power density, motors with varying pole numbers also affect torque fluctuation, noise, and vibration. More poles result in smaller torque fluctuations, as well as relatively lower vibration and noise.

In summary, the pole number of a motor determines its characteristics in terms of output power, rated speed, torque fluctuation, noise, and vibration. For more information on our crane products and their motor specifications, explore the individual product pages linked above. Contact us for personalized assistance in choosing the right crane model for your unique lifting needs.

Contact Kinocranes for more information. E-mail: [email protected].



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