Direct power supply pulls 4. silicon controlled rectifier use a system.
Variable voltage control of 5.VVVF frequency conversion procrastinates use a system.
The characteristic of each system introduces respectively below:
Everybody knows AC motor has a structure compact, maintenance is simple wait for a characteristic. Odd double fast AC motor procrastinates move a system to use control of open loop means, circuit is simple, the value is inferior, because this is current,still apply extensively on elevator. But its defect is intimacy poorer, be used on goods lift commonly so. Speed of elevator of pilot of this kind of system is in 1 meter / the second is the following.
AC motor stator is pressure regulating timing procrastinates move systematic abroad to already applied at elevator in great quantities. This kind of system uses timing of closed circuit of silicon controlled rectifier, impose the kind of apply the brake such as specific power consumption or backset, make elevator of its place pilot can be in in dc is replaced to be mixed quickly in great quantities inside low speed limits communicate pair of fast elevator. Its intimacy is good, smooth layer accuracy is tall, and cost is lower than dc ladder however, the structure is simple, safeguard easily, multi-purpose at 2 meters / the elevator under the second.
It is good that dc motive has timing property, the characteristic with timing big scope, because this early applies at elevator, use a dynamo - drive of electromotor form form. Speed of its pilot elevator amounts to 4 meters / second, but, unit structure volume is large, bad news report is big, safeguard workload bigger, cost is high, because this is commonly used at to speed, intimacy asks taller building is medium.
Direct power supply pulls silicon controlled rectifier move a system to have application early on industry, but use on elevator to solve intimacy problem. (Especially low speed paragraph) should this application is later, it applies at the same time with personal computer almost, compared with electromotor - the dc ladder of generation set form, it has a lot of advantages. Be like: ?5% of banter of earnestly of empty envy, weight is reduced 40% , energy-saving 25% to 35% . 10 meters of the top speed on the world / second elevator uses this kind of system namely, its speed ratio amounts to 1:1200.
At the beginning of 80 time, elevator of pilot of system of transformation of VVVF frequency conversion comes out. It introduces AC motor drive, can reach the level of dc motive however, at present control speed already amounted to 6 meters / second. Its volume is minor, weight is light, efficiency is tall, save the sources of energy to waited to include almost before all advantages of elevator. It is at present newest elevator procrastinates use a system.
Anyhow, from theoretic tell, elevator is the carriage tool of perpendicular motion, need not turning mechanism will procrastinate move, newer elevator procrastinates using a system is linear electric machinery procrastinates actually use a system.
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