Device and method for operating a technical unit, comprising an electric drive machine

A technical equipment, motor technology, applied in the direction of motor control, electric steering mechanism, transportation and packaging, etc.

Active Publication Date: 2013-06-19
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, the disadvantage remains that, if only one coil fails, the power assistance in the servo steering is also abruptly discontinued

Method used

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  • Device and method for operating a technical unit, comprising an electric drive machine
  • Device and method for operating a technical unit, comprising an electric drive machine
  • Device and method for operating a technical unit, comprising an electric drive machine

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Embodiment Construction

[0037] figure 2 The three star-connected coils of a three-phase AC motor are shown symbolically. A short circuit in these coils is indicated by a dotted line as a coil fault, where the fault occurs at one time on only one coil and at another time on both coils. According to the prior art, in both cases and of course when all three coils fail, the contacts of a common neutral relay are simultaneously opened, whereby the coils are deprived of current and the motor does not work, aside from Its inertia and its inherent friction aside. In short, figure 2 It has been shown that in the event of a coil failure, even if only one coil of the motor fails, according to the prior art, the entire servo support function is interrupted.

[0038] image 3 Indicates a number of measurements which show that there is no significant cause for the opening of the neutral point relay if only one motor coil is working with a fault. For the worst case where the servo motor is completely disconn...

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PUM

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Abstract

The invention relates to a device and a method for operating a technical unit, comprising an electric drive machine (9) having at least three windings (Ru, Rv, Rw), to which current may be applied for providing a torque, wherein the current has different current phases for the windings (Ru, Rv, Rw), which can be associated with each of the windings (Ru, Rv, Rw) for generating a rotating field, and a controller (12) for actuating the electric drive machine (9), wherein the windings (Ru, Rv, Rw) are disposed relative each other in a star-like manner, and the ends of the windings (Ru, Rv, Rw) associated with the star point are connected to each other via a star point relay, wherein a diagnosis unit is connected to the windings (Ru, Rv, Rw) and monitors the electric drive machine (9) and / or the controller (12) to ensure that at least two of the windings (Rv, Rw) of the drive machine operate in a fault-free manner, and wherein the diagnosis unit disconnects the star point relay after determining less than two windings (Rv, Rw) operating in a fault-free manner.

Description

technical field [0001] The invention relates to a device and a method for operating technical equipment including electric motors, in particular servo steering systems. Background technique [0002] Such steering systems usually include a control loop whose control parameters depend at least on the steering wheel torque. A predetermined function stored in the controller is used to calculate a target value for the support torque, in particular the steering wheel torque, from the input parameters of the controller. [0003] figure 1 A typical structure of an electromechanically actuated servo steering system of a motor vehicle is shown, comprising a steering wheel 1 coupled via a first part 2 of a joystick 13 to a second part 3 of the joystick 13 by means of one or more ball joints 7 . The joystick 13 transmits the torque applied to the steering wheel 1 by the driver of the vehicle to the drive gear 6 , which meshes with a toothed rod 8 arranged horizontally with respect to ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B62D5/04H02P29/02
CPCB62D5/0487B62D5/0484
InventorC·布泽A·米拉尔克T·雅布龙斯基H·登克曼F·舍特勒
OwnerVOLKSWAGEN AG