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Switching device and method for terminating a braking process of a three-phase ac motor

A technology of AC motor and braking process, applied in the direction of reduction device of AC motor, electric motor/converter plug, etc., can solve the problem of short circuit of the second thyristor, unable to restart the AC motor immediately, etc.

Inactive Publication Date: 2013-07-17
SIEMENS AG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

So the AC motor cannot be restarted immediately as this may cause a short circuit through the second thyristor (freewheeling thyristor)

Method used

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  • Switching device and method for terminating a braking process of a three-phase ac motor
  • Switching device and method for terminating a braking process of a three-phase ac motor
  • Switching device and method for terminating a braking process of a three-phase ac motor

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Embodiment Construction

[0042] figure 1 A schematic diagram of the first switching device 18 for terminating the braking process of the three-phase AC motor 1 is shown. The switching device 18 is electrically conductively connected to the individual phases of the three-phase AC motor 1 . The switching device 18 has a supply line 7 , 8 , 9 and an AC motor line 2 , 3 , 4 for each phase. The supply lines 7 , 8 , 9 are arranged on the input side on the switching device 18 and face the supply network and preferably each have a connection device so that they can be connected to the supply network by means of external lines. The individual alternating current motor lines 2 , 3 , 4 are arranged on the output side on the switching device 18 , facing the alternating current motor 1 . Since the switching device 18 is arranged outside the AC motor 1, the AC motor lines 2, 3, 4 each have a connecting device so that each phase of the AC motor 1 can be connected to the associated AC motor line 2, 3 by means of a...

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Abstract

The invention relates to a switching device (18) and to a method for terminating a braking process of a three-phase AC motor (1). In order to reduce the waiting time between the end of a braking process of an AC motor and possible restarting of the motor in the case of the AC motor (1), the invention proposes that the braking process of the AC motor (1) is performed by means of a first and second thyristor (5, 6), wherein, during the braking process of the AC motor (1), in a first step the first thyristor (5) is actuated in such a way that a braking current (20) is fed to the AC motor (1), and therefore a torque which brakes the AC motor (1) is produced, and in a second step the second thyristor (6) is actuated in such a way that, when the first thyristor (5) is quenched, the braking current (20) is taken on by the second thyristor (6) and the braking torque is maintained, wherein the two steps are repeated during the braking process, wherein the second step is suppressed during the braking process after a last actuation of the first thyristor (5).

Description

technical field [0001] The invention relates to a switching device and a method for ending a braking operation of a three-phase AC motor. Background technique [0002] For various driving purposes, AC motors are often used. These electric motors are activated by various mechanical or electronic switching devices and partially also deactivated in an efficient manner. Such a combination of an actuating device and a braking device or a device capable of both functions is typically used mainly in the woodworking industry. For safety reasons there is a requirement here to bring the sometimes noticeable rotating mass of machines such as milling machines, planers and circular saws to a standstill within a certain time after switching off. This requirement can mostly only be fulfilled by effective braking. [0003] Different methods are provided for efficient braking of AC motors. The commonly used method is DC braking. In addition, this method can be implemented by means of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P3/24
CPCH02P3/22H02P3/24
Inventor 迪尔克·赫兹约翰·塞茨斯特凡·齐茨勒
Owner SIEMENS AG
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