Permanent magnet motors

Elvem PM motors allow you to:

• reduce electricity bills;
• achieve greater efficiency, especially at low load conditions;
• improve performance at speed, especially for speeds below the nominal rating.

6S4 – 7S4-series motors are efficient and innovative synchronous electric motors comprising rotors with rare earth permanent magnets, which generate a constant magnetic field. The rotor turns at exactly the same speed as the magnetic field generated by the stator windings, regardless of the torque demand from the shaft, while in your average asynchronous motor, the slip is proportional to the torque developed.

So with PM synchronous motors, there are no losses linked to the rotor’s magnetization: this translates into the motor using less electricity to produce mechanical energy and heating up less.

The frequency inverters inside deliver a constant torque over a wide range of speeds, kicking in even at lower levels, generating greater efficiency.

The synchronism thus improves the motors’ dynamic performance, offering constant torque over an extensive range of speeds, high performance even when operating at low frequencies (efficiency levels are vastly superior to asynchronous motors) and without the need to use forced ventilation.

Constant torque at various speeds of rotation can also result in a simplified kinematic chain, with all the ensuing advantages.