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Method for obtaining an indication of possible faulty load condition of electric motor

A load condition, faulty technology, used in motor control, motor generator testing, measuring electricity, etc., to solve problems such as time delay, insufficient protection, damage, etc. of overheating identification devices

Inactive Publication Date: 2019-09-10
ELMOS SEMICON SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the power transistor can still heat up to such an extent in this case that damage is caused, which happens so quickly that even the overheating detection device cannot provide sufficient protection due to its time delay

Method used

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  • Method for obtaining an indication of possible faulty load condition of electric motor
  • Method for obtaining an indication of possible faulty load condition of electric motor
  • Method for obtaining an indication of possible faulty load condition of electric motor

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Experimental program
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Embodiment Construction

[0146] The invention is based on the insight that when driving an inductive load such as a motor, a comparator is used to determine whether a transistor has a positive voltage drop (under load) or a negative voltage drop (in the case of inductive feedback) in the on-state case).

[0147] This is an indication of the direction of current flow through the driver (switch). In the case of an inductive load such as a motor, the point in time at which the current direction is reversed is of course determined on the one hand by the control of the modulation motor, but also on the other hand by the behavior of the coil current which is known to follow the modulation voltage. The expected value for when the transition from positive to negative voltage drop will occur (ie the current through the corresponding driver drops to zero) is predetermined by the PWM modulation of the motor and the motor parameters.

[0148] If the position of the algebraic sign transformation of one terminal (...

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Abstract

According to the invention, the electric motor is electrically commutated with the aid of circuitry, in which the phase current experiences a zero crossing at certain time points per motor phase. Owing to the inductive load portion, the time of said zero crossing of a phase current occurs at different times to the time of the zero crossing that would arise with purely ohmic loads. Without a faultyload condition, the time of said zero crossing is within an expected value range (e.g., expected time window) which can be determined by the circuitry, the ambient conditions and by diverse motor parameters. According to the method, during occurrence of the high-side and / or low-side phase connection predetermined in the circuitry, it is determined whether and when the current through the switched-on high-side or low-side switch becomes greater or smaller than a predeterminable threshold, in a particular case in the vicinity of the zero crossing, wherein said time measurement can extend in thecase of a PWM control, if required, over one or more PWM cycles.

Description

[0001] This patent application is based on the application number PCT / EP2015 / 064786 submitted on June 30, 2015. It entered the national stage of the State Intellectual Property Office of the People's Republic of China on December 29, 2016, and the application number is 201580035641.3, and the name of the invention is A divisional application of the Chinese invention patent application "Method for Obtaining Notification, Especially Starting Notification, of Possibly Faulty Load Conditions of Multi-Phase Motors". technical field [0002] The invention relates to a method for obtaining an indication, in particular starting an indication, of a possible faulty load situation of a polyphase motor. Background technique [0003] Faulty load conditions in the motor are particularly critical when a short circuit occurs. Such a short circuit is usually detected by means of a voltage drop on the drain-source path of a driver transistor internal or external to the control unit via which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/024G01R31/34H02M1/32G01R19/165
CPCH02P29/032H02P29/027G01R19/16547G01R31/343H02P29/024H02M1/32H02P29/0241H02P29/0243
Inventor 约尔格·哈茨池
Owner ELMOS SEMICON SE