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A method and device for detecting phase current

A phase current and current technology, applied in current controllers, models/simulations for control purposes, etc., can solve problems such as large phase current errors and inability to directly measure phase currents, and achieve the effect of improving accuracy

Active Publication Date: 2022-07-19
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a method and device for detecting phase current, which is used to solve the problems in the prior art that the phase current cannot be directly measured and the calculated phase current has a large error

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  • A method and device for detecting phase current

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Embodiment Construction

[0064] A method and device for detecting phase current proposed by the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become apparent from the following description and claims. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

[0065] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings , is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated d...

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Abstract

The present invention provides a method and a device for detecting phase current, which calculates the phase current of each phase inside the motor in real time according to the measurable line current and the current current flow direction (ie, the current conduction state). Using an algorithm based on an accurate discrete mathematical model, the calculation of any phase current at the current sampling time is based on the phase current at the previous sampling time and the line current at the current sampling time, which can effectively improve the accuracy of the phase current calculation. The real-time phase current calculation of the motor is realized by combining the software line current sampling and the motor drive. The calculation model derived from the dynamic process of the motor can better restore the dynamic change process of the motor current during commutation.

Description

technical field [0001] The invention belongs to the technical field of motor control, and particularly relates to a method and a device for detecting phase current. Background technique [0002] figure 1 It is a schematic diagram of the electrical connection of the driving end of the brushless DC motor. The driving section is composed of a 3-phase 6-arm switch circuit, which is connected to the load through the U / V / W three-phase. Generally, the three-phase line currents iu, iv and iw flowing into or out of the motor can be obtained by installing a current detection device on the phase line side. figure 2 Schematic diagram of the internal stator side equivalent circuit for a BLDC motor as a load in a star connection. image 3 Schematic diagram of the internal stator side equivalent circuit for a BLDC motor as a load in a delta connection. Since the brushless DC motor is an inductive load, each phase can be equivalent to a RL series circuit of resistance and inductance. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/28H02P6/34
CPCH02P6/28H02P6/34
Inventor 张毅鸣
Owner UNITED AUTOMOTIVE ELECTRONICS SYST