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Three-phase sensored bldc motor drive system and its drive method

A technology of driving system and driving method, which is applied in the direction of electronic commutator, etc., can solve problems such as the failure of the driving system to work normally, and achieve the effects of overcoming the failure of the system to drive normally, convenient production and application, and a wide range of applications

Active Publication Date: 2016-12-28
FORTIOR TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the current three-phase BLDC motor drive system that when any one of the Hall sensors fails, the entire drive system will not work normally, and to provide a method that not only has simple results, but also can completely overcome When any Hall sensor fails, the entire drive system cannot work properly. Defective three-phase sensored BLDC motor drive system

Method used

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  • Three-phase sensored bldc motor drive system and its drive method
  • Three-phase sensored bldc motor drive system and its drive method
  • Three-phase sensored bldc motor drive system and its drive method

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Effect test

Embodiment 1

[0054] Figure 1~3 As shown, the system of the present invention is composed of a commutation processor 1 , three Hall sensors 2 with the same structure, and a three-phase drive circuit 3 . Among them, the three Hall sensors 2 are all arranged near the rotor magnetic steel of the three-phase BLDC motor; the three-phase drive circuit 3 is composed of three groups of field effect transistors with the same structure, and each group of field effect transistors is composed of two It is composed of two field effect transistors connected in series, and the connection point between the two field effect transistors in each group of field effect transistors is connected to one phase winding of the three-phase windings of the three-phase BLDC motor, that is, these three The three connection points in the field effect transistor group respectively correspond to a phase winding. When in use, the rotor position signals detected by the three Hall sensors 2 are processed by the commutation p...

Embodiment 2

[0058] Such as Figure 4 As shown, this embodiment is based on Embodiment 1, and the driving implementation method when any Hall sensor fails, and the specific steps are as follows:

[0059] (1) The drive system detects whether there is a damaged Hall sensor, and if there is, the problematic Hall sensor is shielded; if not, it is driven according to the normal driving method with a Hall sensor;

[0060] (2) Generate the motor rotor current according to the TH-1 starting method, and keep the current until the Hall sensor generates a new state change signal;

[0061] (3) Determine whether the new state change signal is the first state change signal; if yes, then return to step (2); no, then perform step (4);

[0062] (4) Calculate the time interval Δt of the previous two new state change signals;

[0063] (5) Determine whether the damaged Hall sensor should logically generate a state change signal within the past Δt, if yes, then generate a new current switching signal accordi...

Embodiment 3

[0083] Such as Figure 6 As shown, the difference between this embodiment and embodiment 2 is that embodiment 1 is a start-up method when one Hall sensor fails, and this embodiment is when two Hall sensors fail at the same time. The start method, the specific steps are as follows:

[0084] (1) The drive system specifies and shields the Hall sensor in question;

[0085] (2) Generate the motor rotor current according to the TH-2 starting method, and keep the current until the Hall sensor generates a new state change signal;

[0086] (3) Determine whether the new state change signal is the first state change signal; if yes, then return to step (2); no, then perform step (4);

[0087] (4) Generate a new current switching signal according to the current current distribution state and the signal processing logic under normal conditions;

[0088] (5) Calculate the time interval Δt of the previous two new state change signals, and use the Δt / 3s second time value to update the 60° t...

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Abstract

The invention discloses a three-phase sensored BLDC motor drive system, which is characterized in that it mainly consists of a commutation processor (1), three Hall sensors (2) arranged near the magnetic steel of the three-phase BLDC motor rotor, and Composed of a three-phase drive circuit (3) connected to the three-phase windings of the three-phase BLDC motor, the rotor position signals detected by the three Hall sensors (2) are processed by the commutation processor (1) and sent to To the control terminal of the three-phase drive circuit (3). The invention can not only overcome the defect that the system cannot operate normally when one Hall sensor fails in the traditional three-phase BLDC motor drive system, but also overcome the defect that the system cannot drive normally when two Hall sensors fail, so the application range is very wide , easy to promote and apply.

Description

technical field [0001] The invention relates to a motor drive system, in particular to a three-phase sensored BLDC motor drive system and a drive method thereof. Background technique [0002] At present, the use of Hall sensors to detect the position of the motor rotor can not only make the start and operation of the three-phase BLDC (brushless DC motor) very robust, but also enable the motor to have a wider speed regulation range. However, traditionally, three-phase BLDC must use three Hall sensors. Once any one of the Hall sensors fails, the drive system will not be able to accurately obtain the rotor signal and will not work. In practical applications, the Hall sensor is a very sensitive and fragile device, and it has very strict requirements on the conditions of use and the environment in the application. Therefore, how to make the three-phase motor still work when some Hall sensors are damaged is a problem of great concern in many applications, but so far people have n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/16
Inventor 毕磊
Owner FORTIOR TECH SHENZHEN
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