How permanent magnet motor and full closed-loop control achieve the excellent performance of MRL Passenger Elevator

In the field of vertical transportation in modern buildings, MRL passenger elevator has become the preferred solution for high-rise buildings due to its advantages such as high space utilization and flexible design. The permanent magnet motor and full closed-loop torque, position and speed control technology give the machine room-less passenger elevator excellent performance, making it far superior to traditional elevators in terms of operating efficiency and comfort. ​
As the core power component of the machine room-less passenger elevator, the permanent magnet motor has a significant feature of high efficiency. When working, traditional motors need to generate magnetic fields through current excitation. In this process, a large amount of electrical energy is consumed in the excitation link and wasted in the form of heat energy, which greatly reduces the energy conversion efficiency. The permanent magnet motor uses high-performance permanent magnet materials to replace the traditional excitation winding, and does not require additional excitation current, which reduces this part of energy loss from the root. During the operation of the machine room-less passenger elevator, whether it is to overcome the dead weight of the car when going up without load, or to balance the huge weight when going down with full load, the permanent magnet motor can efficiently convert the input electrical energy into mechanical energy to drive the elevator. Taking the daily operation scenario of high-rise buildings as an example, with frequent elevator starts and stops and long-distance operation, permanent magnet motors can still maintain efficient energy conversion, greatly improving the overall energy utilization efficiency of elevators. ​
High torque is also an outstanding advantage of permanent magnet motors. Torque determines the ability of the motor to drive the load. In the actual use of machine room-less passenger elevators, the elevator load is always in dynamic change. From the heavy load of more than a dozen people during the early morning rush hour to the empty state of only one or two people riding late at night, the permanent magnet motor can always respond quickly and provide stable driving force with its powerful torque output. At the moment of elevator start-up, the powerful torque can quickly overcome the static inertia and achieve smooth and rapid acceleration, so that passengers do not feel obvious setbacks; when the elevator slows down and stops, it can accurately control the driving force to ensure that the elevator stops smoothly at the target floor, avoiding shaking and impact caused by insufficient torque or fluctuations, and creating a stable and comfortable elevator environment for passengers. ​
Low energy consumption is the key feature of permanent magnet motors that meets the needs of the times. At a time when energy conservation and emission reduction and green building concepts are prevalent around the world, this feature brings strong competitiveness to machine room-less passenger elevators. Since permanent magnet motors do not need to continuously consume a large amount of electric energy for excitation, and the energy conversion loss is small, the energy consumption during the operation of the elevator is greatly reduced. For large shopping malls, office buildings and other places with dense crowds and frequent elevator use, the energy-saving effect brought by permanent magnet motors is very considerable with hundreds or thousands of operations every day. It not only saves a lot of electricity expenses for building operators and reduces operating costs, but also reduces carbon emissions caused by energy consumption, actively responding to the concept of sustainable development. ​
The full-closed-loop torque, position and speed control technology provides guarantee for the excellent performance of machine room-less passenger elevators from the operation control level. The full-closed-loop control technology relies on high-precision sensors to collect elevator operation data in real time to form a complete feedback control system. ​
In terms of torque control, the full-closed-loop system will accurately adjust the torque output of the permanent magnet motor according to the real-time load, running direction and other states of the elevator. When a large number of passengers suddenly rush into the elevator at the bottom floor, the system will sense the load change in a very short time and immediately increase the torque to ensure that the elevator can still run upward at a stable speed; as passengers leave on different floors one after another, the load is reduced, and the system will automatically reduce the torque, ensuring smooth operation while avoiding energy waste. This precise torque control eliminates the elevator running jitter caused by torque fluctuations, allowing passengers to experience a stable experience during the ride. ​
In terms of position control, the fully closed-loop system uses high-precision sensors to continuously monitor the position of the elevator car. When the elevator approaches the target floor, the system accurately controls the elevator to decelerate according to the preset stop position. Whether it is stopping after high-speed operation in a 100-meter-high building, or in the use scenario of frequent start and stop in a multi-story building, the fully closed-loop position control can ensure that the elevator stops accurately at the level position with minimal error. This not only facilitates passengers to enter and exit the elevator safely, but also avoids the potential safety hazards caused by the deviation of the stop position, making passengers feel more at ease when riding. ​
Speed ​​control is also an important function of the fully closed-loop system. During the elevator start-up acceleration stage, the system controls the elevator to accelerate smoothly from a stationary state to the rated operating speed according to the pre-set optimal speed curve to avoid the feeling of weightlessness caused by excessive acceleration; during the operation process, real-time monitoring and resistance to external factors interfere with the elevator to maintain a stable speed; in the deceleration and stop stage, the speed is accurately controlled to drop so that the elevator stops slowly. Through precise control of speed, the discomfort caused to passengers by sudden speed changes is effectively reduced, greatly improving riding comfort.