Sanjin Elevator: Elevator motor control strategy

Sanjin Elevator: Elevator motor control strategy: 1.basic idea of ​​vector control 1971, by the German company Siemens F.Blaschke proposed vector control theory of AC elevator motor contro...

Elevator motor control strategy

1.basic idea of ​​vector control
1971, by the German company Siemens F.Blaschke proposed vector control theory of AC elevator motor control theory to obtain the first qualitative leap, the theory first induction elevator motor control system to be successful, then introduced synchronous elevator motor control system medium. In the inverter case, the analysis of permanent magnet synchronous elevator motor, which is usually synchronous rotation d, q coordinate system under the Park model. In this model, synchronous motor voltage, current and flux can be decomposed into mutually decoupled d, q-axis component. The permanent magnet synchronous elevator motor output torque control can be attributed to the cross-axis current and direct axis current control. With vector control AC drive system, its performance can be achieved even more than DC elevator motor speed control performance.
2.The basic idea of direct torque control
1985 Germany's Ruhr University Professor Depenbrock direct torque control theory, the basic idea is to maintain a constant amplitude of the stator flux under the premise of the stator flux by adjusting the rotational speed of the space, and then adjust the slip frequency to control the elevator motor torque and speed. The method is analyzed in the stator coordinate system mathematical model of the AC elevator motor, the elevator motor torque emphasis on direct control, eliminating the vector rotation transform complex transformations and calculations.

Sanjin Elevator: Introduction elevator motor

Sanjin Elevator: Introduction elevator motor: The traditional elevator drive is to use multi-gear transmission, the elevator motor is mainly used in induction elevator motor . The main ...

Introduction elevator motor

The traditional elevator drive is to use multi-gear transmission, the elevator motor is mainly used in induction elevator motor. The main problem with the gear transmission is the use of worm gears or other mechanical planetary reduction mechanism, not only caused the system structure complex, maintenance work difficult, noisy shortcomings, and the efficiency of the gear transmission is very low, such as worm gear worm gear efficiency is only 70 percent, large energy consumption of the whole system running costs. Meanwhile, this transmission mode due gearbox and traction machine larger, require large-mounted engine room, not only occupied the building thereby increasing the effective area of ​​the construction costs, but also affects the overall beauty of the building facade
     To solve these problems, from the 1990s onwards, the elevator industry related companies began to explore for new tractor. March 1996, Finland's Kone (KONE) has introduced a shocking industry 3000MoooSpace MRL, its core is EcoDisc disc magnet synchronous traction machine, thus creating a gearless elevator a new era.
     Water magnet synchronous gearless traction machine with flat, disc shape, with axial magnetic field, the radial magnetic field rotor, outer rotor radial magnetic field three structures, large radial dimension of the elevator motor, and more on the pole, is a low-speed , high torque permanent magnet synchronous elevator motor. This elevator motor is short axial dimension, light weight, small size, compact structure, the stator winding has a good cooling conditions, availability of high power density. Meanwhile, the elevator motor rotor inertia is small, mechanical and electrical time constant, peak torque and high stall torque, torque mass ratio, low running smoothly, with excellent dynamic performance.

Sanjin Elevator: Elevator motor development overview

Sanjin Elevator: Elevator motor development overview: Making use of a permanent magnet elevator motor, has a long history, is the world's first electric elevator motor permanent magnet elev...

Elevator motor development overview

Making use of a permanent magnet elevator motor, has a long history, is the world's first electric elevator motor permanent magnet elevator motor, but early permanent magnetic material is low, permanent magnet elevator motor is very heavy, so soon to be replaced by a elevator motor excitation current . By the 20th century, 30 years later, with high remanence density Alnico materials and has a high coercivity ferrite permanent magnet material has appeared, permanent magnet elevator motor began to develop. But these two permanent magnet materials have weaknesses, the performance is not satisfactory, mainly for micro machine area. The late 1960s, the rare earth permanent magnet materials and various other performance continues to improve, and promote the rapid development of the permanent magnet elevator motor. Has three generations of rare earth permanent magnet materials, rare earth permanent magnet materials performance has been greatly improved. Of particular note is that our country is a big country of rare earth reserves of the world, our research in this area has also made great progress
The basic structure of permanent magnet synchronous elevator motor and the type of
    Permanent magnet synchronous elevator motor is a synchronous elevator motor by a winding evolved, its structure and winding synchronous elevator motor is basically the same. By a three-phase winding and the stator core structure, and often Y-shaped armature windings connected; structure of the rotor, permanent magnet synchronous elevator motors with permanent magnets instead of electrical excitation, thus eliminating the excitation coil, slip rings and brushes. Compared with ordinary elevator motor, permanent magnet synchronous elevator motors must also be equipped with a permanent magnet rotor position detector for detecting the magnetic pole position, and thus on the armature current control to achieve the purpose for PMSM servo control.
    Compared with other elevator motors, AC permanent magnet synchronous elevator motor structure is relatively simple, it is characterized by: a relatively high power factor and efficiency; effective material utilization is high; their output power; small; reliable operation. Since permanent magnet synchronous motor in certain technical performance is superior brushless DC servo elevator motors and induction elevator motors, so in high-performance permanent magnet synchronous elevator motor servo drive system (especially small and medium-power control system of all kinds) has been widely applications, such as CNC machine tools, industrial robots, LSI manufacturing, office automation equipment, flexible manufacturing systems, petrochemical equipment, manned spacecraft, power tools and household appliances and other fields.

Sanjin Elevator: Comparison of elevator motors

Sanjin Elevator: Comparison of elevator motors: Below these are several elevator motor speed control system to make a comparison.     2.1.1 and AC drive systems, DC speed control system is...