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Its rotor is equipped with a magnetic pole using a high-performance NdFeB permanent magnet material, and the magnetic pole rotates with the rotor. Its rotor has no loss and no heat problem, so it is more efficient. And because it does not require reactive excitation current, the power factor is also high.
Since there is no mechanical deceleration mechanism, there is no corresponding mechanical loss, which improves the mechanical transmission efficiency (about 30% compared with the worm gear transmission). The total energy saving is about 40%.
Most of the noise of conventional geared traction elevators comes from the mechanical vibration generated by the gearbox and the noise and vibration of the motor itself rotating at high speed. Since the gearless traction machine does not have a mechanical reduction mechanism, there is no noise and corresponding mechanical vibration of the gearbox. At the same time, the motor rotates at a very low speed (rated speed 90-180r/min), and the noise and vibration of the motor itself are small, so that the noise of the entire elevator system is greatly reduced.
The performance-price ratio improves the cost of the motor itself due to the use of high-performance permanent magnet materials, but the gear reduction mechanism is eliminated, which simplifies the structure and reduces the manufacturing cost. At the same time, due to the improvement of motor efficiency and transmission efficiency, the capacity of the inverter for driving the motor is greatly reduced. For example, the elevator speed of gear transmission traction is 1.75m/s and the load is 1000kg. The inverter configuration generally requires a capacity between 18.5kW and 22kW. The traction elevator driven by the permanent magnet synchronous motor can only be equipped with a capacity of 11 kW to 15 kW. Therefore, while achieving higher performance, the manufacturing cost of the system has not been significantly improved, not to mention the long-term benefits brought about by saving energy. In the long run, the cost of a gearless traction elevator driven by a permanent magnet synchronous motor may be lower than that of a conventional product.