DE2835945A1 - Actuator for lift doors - has two magnetic pole groups changed over for optimum door actuating torques - Google Patents

Abstract

The compact actuator for lift doors has rotating field magnets coupled to a drive. Two different groups of magnetic poles ensure optimum opening, closing and moving speeds of doors. The magnets are arranged as a change pole system. Pole change is ensured with e.g. a Dahlander Pole changing circuit. The magnetic system pole change is carried out with two windings with the different number of poles. Different torques are obtained by changeover of windings or by changing voltage with a phase shift control system.

Description

Drive device by rotating field magnets

Elevator cabins for cable elevators, but also for oil-hydraulic elevators are carried out inside the cabin due to the required safety regulations Doors located additionally protected. These doors are because of the limited space mostly designed as sliding doors that act on one or both sides.

These doors are driven electrically by means of a rotary electric motor in conjunction with appropriate base devices such as gears and the like. Rotating field magnets are often used to operate these doors. Rotary field magnets are drive units developed from normal three-phase motors, which are permanently or for certain periods of time under tension with the rotor locked. The torque characteristic of such rotating field devices shows a steadily decreasing characteristic depending on the speed.

The conveying capacity of passenger elevators is in addition to the travel speed and the driving periods for acceleration and braking, also for the idle times of the elevator The downtimes are determined by the speed, with which the doors inside the elevator car are opened and closed. That The command for opening and closing these doors is from the elevator control addicted. With single-speed three-phase motors or rotating field magnets is with a constant and fixed opening and closing speed for the doors in the elevator car to be expected.

The invention is based on the premise that for the opening, Closing and retraction speed of these doors in the elevator car optimal conditions can then be achieved if the rotating field magnets used for two different numbers of poles are carried out. This can be achieved on the one hand by the execution of the rotating field magnets with special windings z. B. Dahlander circuit or PAM circuit, on the other hand different due to the arrangement of two windings -ner number of poles in a rotating field magnet. With a winding for two speeds usually the number of poles or speed ratios of 1: 2, while with two separate windings, but partly also with the special winding with PAM switching unit Can achieve speed ratios of 1: 3 to 1: 6. According to the idea of the invention can now use the higher number of poles of the rotating field magnet for the lower speed when opening or closing or for a specific introduction in both processes (Opening and closing) can be used. Another variant is to use different numbers of poles and thus speeds for opening or closing possible. A jerky opening or closing of the doors in the elevator car to avoid the torques of the rotating field magnet by switching the winding depending on the assignment of the circuit type reduced or in different ratios be increased, e.g. B. It is possible in the basic delta connection with star connection to reduce the torques of the triangle connection to 1/3 0 With Dahlander connection in the low number of poles there is a possibility of variation in the ratio 1: 4 (Y / YY connection) or 3: 4 (/ YY connection) possible. You can also use a reduction the voltage at the terminals of the rotating field magnet, e.g. B. by a phase control, reduce the torques accordingly. Switching for the different Pole numbers or switching the winding circuit itself to reduce or The torque can be increased by mechanical switching elements, but also by Electronic switching devices are provided in connection with the elevator control will.

The invention is explained in more detail in the following example: The rotating field magnet (1) has a 12/6 pole Dahlander circuit winding. The inner circuit (2) the winding is with 6 connecting cables 3) to the terminal board in the connection box (4) of the rotating field magnet (1). By switching accordingly over mechanical switching elements (contactors) and / or an electronic switching device it is possible with delta connection (3a) of the winding 6 pole pairs and thus one 12-pole rotating field magnets. In contrast, it has the same rotating field magnet in the double-star connection (3b) 3 pole pairs and thus 6-pole.

If 9 or 12 winding ends are connected, there is also the Possibility of switching over in both numbers of poles.

In the lower speed stage (3a) it started with an increase in the number of terminals on 9 the winding can also be connected in star, then the rotating field magnet gives only 1/3 of the torque in triangular hold. At the high speed (3b) in Double star connection is a switch to triangle or star with 12 R terminals (low number of poles / high speed) possible. With the DreLeck circuit, a torque of 3/4 of the full torque and in the star connection of 1/4 the full torque of the double star circuit on the shaft of the rotating field magnet submitted.

Elevator operation significantly reduced and the annual comfort accordingly increase.

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Claims (5)

Claims Drive the feel for elevator cars with rotating field magnets in connection with gearboxes, that the Rotating field magnets are designed to be pole-changing and thereby. different locking, Reach opening and retraction speeds. 2. Drive of the doors for elevator cars in connection with rotating field magnets with gears according to claim 1. d a d u r c h g e k e n n z e i c h n e t that the Pole switching of the rotating field magnet with one winding, e.g. 3 '. Dahlander circuit or PAM circuit. 3. Drive of the doors for elevator cars with rotating field magnets with gears according to claim 1. d a d u r c h -g e k e n n z e i c h n e t that the Pole switching of the rotating field magnet with two windings with different numbers of poles he follows. 4. Drive of the doors for elevator cars with rotating field magnets with gears according to claims 1-3, d a -d u r c h g e k e n n n z e i c h n e t that different torques of the rotary solenoid due to the switch the respective winding or by changing the voltage with a phase switch control can be achieved. 5. Drive of the doors for lift cabins with rotating field magnets in connection with gears according to claims 1 - 4, d a "by c h g e k e n n n z e i c h n e t that the switching of the windings of the rotating field magnet for different speeds or torques through mechanical switching elements and / or through electronic switching devices he follows.