Control of long-stator linear motor coils of long-stator linear motor stator

Abstract

The present invention provides a method and device for controlling the n LLM coils (L1, . . . Ln) of an LLM stator making it possible to change the polarity of the coil voltage (UL1, . . . , ULn) of the n LLM coils (L1, . . . Ln) more easily and with little circuit complexity. It is proposed to apply a first operating potential (Ub1) to n first input terminals (A1, . . . , An) of n half bridges (HB1, . . . , HBn), and apply a second operating potential (Ub2) to n second input terminals (B1, . . . , Bn) of the n half bridges. For each half bridge (HB1, . . . HBn), a first switch (S11, . . . , S1n) is connected between a center point (C1, . . . , Cn) of the respective half bridge (HB1, . . . , HBn) and the first input terminal (A1, . . . , An), and a second switch (S21, . . . , S2n) is connected between the center point (C1, . . . , Cn) of the relevant half bridge (HB1, . . . , HBn) and the second input terminal (B1, . . . , Bn). The center point (C1, . . . , Cn) of the n half bridges is connected in each case to n first terminals (L11, . . . , L1n) of the n LLM coils (L1, . . . , Ln), and the second terminals (L11, . . . , L1n) of the n LLM coils (L1, . . . , Ln) are connected in a control point (C) that is regulated to a predetermined potential (Ux).

Description

technical field [0001] The invention relates to a method and a device for controlling a plurality of LLM coils of an LLM stator. Background technique [0002] The stator of a long stator linear motor (LLM) consists of a plurality of LLM coils arranged side by side, which together form the stator of the LLM. The LLM coils are controlled individually or in groups, wherein it is often also desirable or necessary to change the polarity, ie to change the current direction of the LLM coils, during operation of long-stator linear motors. By controlling the LLM coils, a moving magnetic field is generated which cooperates with an exciter magnet (usually a permanent magnet) on the transfer unit of the LLM to move the transfer unit along the stator. Here, the basic structure and function of the LLM are sufficiently known and therefore not described in detail here. In order to energize the LLM coil to generate a magnetic field, an operating voltage may be provided between a first oper...

AI Technical Summary

Problems solved by technology

This results in high costs for the necessarily high number of LLM coils of the LLM stator as well as a high circuit-technical outlay due to the high number of switches

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