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Current detection device

A current detection device and current technology, which are applied to measurement devices, electromechanical devices, and only current measurement, can solve problems such as current detection errors and mixing, and achieve the effect of improving control accuracy.

Pending Publication Date: 2022-04-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the magnetic sensor of each phase, the disturbance magnetic flux caused by the current of the other phase may be mixed, and a current detection error may occur

Method used

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Embodiment approach 1

[0036] The current detection device according to Embodiment 1 will be described with reference to the drawings. figure 1 It is a schematic configuration diagram of the AC rotating electric machine 1 and the control device 10 according to the present embodiment. The current detection device is incorporated in the AC rotating electrical machine 1 and the control device 10 .

[0037] 1-1. AC rotary motor 1

[0038] The AC rotating electrical machine 1 includes a stator 18 and a rotor 14 arranged radially inside the stator 18 . The first group of n-phase armature windings and the second group of n-phase armature windings (n is an integer equal to or greater than 3) are wound around the iron core of the stator 18 . In this embodiment, n is set to 3. That is, the stator 18 is provided with a first set of three-phase armature windings Cu1, Cv1, and Cw1 of U1, V1, and W1 phases, and a second set of three-phase armature windings of U2, V2, and W2 phases. Cu2, Cv2 and Cw2. The thre...

Embodiment approach 2

[0210] A current detection device according to Embodiment 2 will be described with reference to the drawings. As in Embodiment 1, a current detection device is incorporated into AC rotating electrical machine 1 and control device 10 . The description of the same structural parts as those in the above-mentioned first embodiment is omitted. The basic configurations of the AC rotating electrical machine 1 and the control device 10 according to this embodiment are the same as those of the first embodiment, but the phase difference Δθ between the armature windings of the first group and the armature windings of the second group is different from that of the first embodiment. , and accordingly, the setting of the inclination angle θt of each magnetic sensor is different from Embodiment 1.

[0211] In this embodiment, if Figure 11 As shown, the phase difference Δθ in electrical angle between the positions of the three-phase armature windings Cu2, Cv2, and Cw2 of the second group r...

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Abstract

Provided is a current detection device that detects a current flowing through a plurality of sets of multi-phase armature windings by means of magnetic sensors disposed at positions where magnetic fluxes radiated radially from a rotor intersect, the purpose of the present invention is to suppress deterioration in control accuracy of output torque due to a current detection error caused by the magnetic flux of a rotor. The inclination angle of the magnetic flux detection direction of each phase magnetic sensor of each group with respect to a radial orthogonal plane, which is a plane orthogonal to the radial direction passing through each magnetic sensor, is set such that the sign of the ripple component of the first group is different from the sign of the ripple component of the second group.

Description

technical field [0001] The present invention relates to current detection devices. Background technique [0002] For example, there is a current detection device that detects the current of each phase winding of an AC rotating electrical machine having two sets of three-phase windings using a magnetic sensor. However, in the magnetic sensor of each phase, disturbance magnetic flux due to the current of another phase may be mixed, and a current detection error may occur. Various structures for reducing this error have been proposed. [0003] For example, in the current detection device described in Patent Document 1, the current path of one phase is formed in a U-shape, and the first magnetic sensor and the second magnetic sensor are arranged on the first opposing portion and the second opposing portion where the current directions are opposite to each other. sensor to reduce current detection errors due to external disturbance flux. [0004] prior art literature [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/20G01R19/00
CPCG01R15/20G01R19/0092H02K11/27H02M1/0009H02P6/10H02P6/08
Inventor 古川晃
Owner MITSUBISHI ELECTRIC CORP