Elevator motor characteristics

Elevator Performance With computer control technology and development of inverter technology has greatly improved, but there is asynchronous frequency inverter elevator motor torque at low speed low enough to run smoothly thereby affecting the low-speed range undesirable drawbacks.
Replacement of permanent magnet synchronous AC induction elevator motor speed control elevator motor, asynchronous with synchronization frequency inverter can solve the low-speed alternative to paragraph shortcomings and start-up and operation of the jitter problems, make the elevator run more smoothly, more comfortable, while reducing the size of the elevator motor, reducing noise.
Using a gear elevator traction machine, when the elevator brake failure, the car generates free fall, you can take advantage of permanent magnet synchronous elevator motor current braking function ensures that the car slow slip car for elevator safety adds a security barrier.
Permanent magnet synchronous elevator motors and asynchronous elevator motors and features of the main differences
Due to the asynchronous elevator motor is to rely on the elevator motor rotor stator current excitation, and permanent magnet rotor with permanent magnets generate magnetic fields do not need direct electrical excitation. Therefore, permanent magnet synchronous elevator motor has a simple structure, reliable operation, small size, light weight, high efficiency, flexible shape and size and other characteristics.
AC permanent magnet synchronous elevator motor speed elevators main advantages
1, simple structure, reliable operation, because no excitation permanent magnet rotor, eliminating the coil or the cage, simplifying the structure to achieve a brushless, reducing the failure, easy maintenance, easy maintenance complexity factor greatly reduced.
2, temperature rise, a small volume of permanent magnet synchronous elevator motor and induction elevator motors, because no reactive excitation current, and includes:
(1), high power factor, close to 1.
(2), sinusoidal EMF reduces the amplitude of higher harmonics, effective solution to the interference of the power supply.
(3), reducing the elevator motor copper loss and iron loss.
Synchronous elevator motor heating temperature rise is small (about 38K), elevator motor shape, small size compared with asynchronous elevator motors, reducing one to two frame sizes.
3, ultra-high efficiency energy saving, because the high power factor (can be approximated as 1), but also eliminates the need for electrical excitation, reducing the stator current and stator rotor resistance loss, high efficiency (94 to 96%), full load starting current reduction than asynchronous half, so the energy saving effect is obvious, for the elevator, synchronous elevator motors can be saving more than 40% (after the user actually uses the test results), light load current is small, only about 10% of induction elevator motors, such as light load 11KW asynchronous induction elevator motor elevator motor current 10A, while the synchronous elevator motor light load current is only 0.7A.
4, wide speed range up to 1:1000 even higher (asynchronous elevator motors only 1:100 Note: Asynchronous elevator motor with speed sensor feedback is also up to 1:1000), high speed accuracy can be greatly enhanced the quality of the elevator.
5, the permanent magnet synchronous elevator motor at the rated speed elevator to maintain constant torque, for improving the operation of the lift stability is essential. Given curve can be done coincident with the operation curve, especially in the low frequency elevator motor, low pressure, low speed to provide sufficient torque to avoid jitter during the elevator starting retarder, the elevator start to improve comfort during braking.
6, the permanent magnet synchronous elevator motor starts running at full load current does not exceed 1.5 times the rated current, configure the drive without increasing power configuration, reducing the cost of the drive.
7, permanent magnet elevator motor constant torque and wide speed advantage, the elevator motor can be made into a multi-polar, for the removal of gear teeth of the car-free (ie, gearless traction machine) to create the conditions that promote the elevator technology.
8, the permanent magnet synchronous elevator motor EMF elevator can be designed into a sine wave, low loss, low vibration, low noise, environmental protection requirements.
9, the use of permanent magnet synchronous elevator motor dynamic braking functions, implementation of a tooth elevator secondary security.
10, the use of permanent magnet synchronous elevator motor of the elevator can save energy 40%, each annual electricity savings of nearly million dollars.
11, permanent magnet synchronous elevator elevator motors and drive system for driving the synchronous elevator motor drive components. Current synchronization frequency inverter with the same power compared to the price of the asynchronous equivalent, but the use of permanent magnet synchronous elevator motor drive power level lower than asynchronous machine, you can reduce costs.