UPDATE Archive • Rotors with buried magnets



UPDATE EDITION 03/2018

Rotors with buried magnets

By manufacturing rotors with buried magnets, not only is SycoTec expanding its own portfolio but also giving customers additional room for manoeuvre in the design and construction of their drives.

More power for favourable conditions
Classic electric motors use bowl-shaped surface magnets arranged in a ring on the rotor and fixed in place with a bandage of glass or carbon fibre composite. They are particularly well suited for high speeds of up to approx. 300 m/s. Compared to the simple rotor arrangement, permanent magnets have a more complex shape, which results in the use of more materials.
Rotors with so-called buried magnets, also known as Integrated Permanent Magnets (IPM), take a different approach. Here, bar-shaped permanent magnets are glued into punched cut-outs in the rotor plates. The additional reinforcement needed when using surface magnets is no longer required. The normally required choke is also unnecessary in most cases. This and the simpler magnet shape reduce the manufacturing costs for large quantities.

The customer has all the advantages
The main technical advantage, however, lies in the improved field-weakening capability and overload capability. In practice, this means: constant power over a larger speed range. This allows more power motors to be manufactured, especially at medium circumferential speeds of up to 100 m/s. For SycoTec customers, the expansion of the product range is therefore a gain in every respect: more possibilities, more power and more favourable series production conditions.