PM Synchronous Motors

PM synchronous motors are an alternative particularly to asynchronous machines concerning special applications. They stand out due to a number of advantages. Higher efficiency and a more compact design are a clear asset over restrictions in potential operating ranges. Especially the sensitivity of the PM magnets regarding temperature, mechanical shock and flawed current supply of stator winding need to be highlighted.

ELIN Motors globally deliver PM synchronous machines according to customer specifications in various designs and performance levels, amongst others, to the following industry fields:

 

 

  • Wind Energy
  • Plastics Industry
  • Marine Industry

As a globally operating specialist for electric machines, ELIN Motors is your perfect partner for synchronous motors in any design and size.

PM Synchronous Motors According to Types

PM synchronous motors by ELIN Motors stand out due to their high levels of efficiency and reliability. The various types are classified by the following criteria:

 

Voltage Range:Low VoltageHigh Voltage
Winding System:Distributed Winding Tooth Coils
Rotor Design:Surface MagnetsBuried Magnets
Cooling Technique:Air CoolingWater Cooling

In general, PM synchronous machines are operated on the frequency converter. The corresponding requirements concerning the electric strength are considered in the design.

Surface Magnets

Surface magnets can be attached to the rotor via bonding techniques. Additional bindings generate further stabilization.

Buried Magnets

Implementing this design, the rotor carries the magnets below the rotor surface according to their recess. Due to the newly accumulated space, the magnets can be adjusted advantageously. As a result, the field weakening area can be used more efficiently.

Distributed Winding

This winding system is suitable for all types of induction machines. Most-widely implemeted are distributed windings as two-layer windings for polyphase voltage systems.

Counting Coil Design

The advantage of this design lies in the winding head’s compactness. Due to the shorter winding head and the higher line density of a PM synchronous machine, the required space for the drive can be further reduced.

Motor Details

Operating Principle
Technical Structure

The operating principle of any electric machine is defined by the reciprocal repelling of the magnetic fields of stator and rotor. In case of the PM synchronous machine, the permanent magnets in the rotor create a field. The power distribution in the stator winding generates itself again a corresponding magnetic rotating field repelling the rotor.

 

 

 

The most vital components of PM synchronous motors are:

  • Active parts (stator / rotor)
  • Casing
  • Shaft
  • Bracket
  • Support
  • Fan
  • Terminal box, auxiliary terminal box
  • Sensor system (temperature, vibrations, etc.)
  • Stand-by heating (optional)
  • Additional equipment according to customer requirements

Cooling Systems

Only the machine’s cooling system ensures the operating point in the required heating phase.

In the following you can find an example of the applied cooling systems: 

 

IC411Surface Cooling (heat derivation via fins and ribs on casing) – airflow is provided by a fan on second shaft end.
IC81WAir-Water Heat Exchanger
IC511Recooling via air-air heat exchanger (pipe machine)
IC611Recooling via air-air heat exchanger (external fitting)
IC7A0W7Water-Jacket Cooling
IC01Open Construction: cooling with ambient air
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