Permanent magnet traction machine
1. High efficiency and energy saving, with excellent dynamic performance from the drive system: The permanent magnet synchronous traction motor uses a multi-pole low-speed direct drive design, eliminating the need for large worm gear and worm reduction gearboxes that typically have an efficiency of only around 70%. Compared to induction motors, it doesn’t draw reactive current from the grid, resulting in a high power factor. Since there’s no excitation winding, there’s no excitation loss, leading to less heat generation, so no fan is required—no wind noise or friction, which contributes to higher efficiency. With field-oriented vector control, it delivers performance similar to DC motors, offering precise torque control. The starting and braking currents are significantly lower than those of induction motors, reducing the required motor power and inverter capacity.
2. Stable operation and low noise: The motor runs at low speed directly, minimizing bearing noise. Without a fan or worm gear, the overall noise level is reduced by approximately 5 to 10 decibels, contributing to a quieter environment and less noise pollution.
3. Space-saving design: There's no large gearbox or excitation winding, and the use of high-performance NdFeB permanent magnet material makes the motor compact and lightweight. This reduces the need for a machine room or even eliminates it entirely, making it ideal for modern building designs.
4. Long service life and high reliability: The absence of brushes and slip rings ensures a longer lifespan. Additionally, the lack of gearboxes means fewer oil and gas emissions, resulting in less environmental impact and improved safety.
5. Low operational and maintenance costs: With no brushes or gearboxes, the system requires minimal maintenance, making it cost-effective over time.
Compared to geared traction machines, the permanent magnet synchronous traction motor offers clear advantages in energy efficiency and environmental protection. This technology has been widely accepted in Europe and Japan for years and is now gaining attention in the Chinese market. Beyond the obvious benefits, it also enhances safety through a simplified structure and rigid straight-axis braking, providing continuous overspeed protection in both upward and downward directions. The back electromotive force of the permanent magnet motor enables self-locking functionality, adding multiple layers of safety for the elevator system and passengers. At the application level, its compact and slim design improves elevator layout flexibility and space utilization, allowing architects more freedom in their designs. Ultimately, this leads to better functionality and user experience within the built environment.
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