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Motor starting state recognition method

An identification method and motor starting technology, applied in the direction of motor control, starting devices, electrical components, etc., can solve the problems of difficulty in accurately judging the state speed of the motor when starting, high hardware cost, easy damage to mos and motors, etc., to achieve improvement The effect of success rate and reliability, simple method and high accuracy

Inactive Publication Date: 2019-04-12
上海肖可雷电子科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the DC brushless motor scheme, it is difficult to accurately judge the state of the motor at startup and the speed at startup, so it is difficult to adopt a corresponding startup method for the state of the motor at startup
In the prior art, it is generally used to test the three-phase current by opening the third bridge to identify the speed and direction of the motor before starting, but there is a risk that the mos and the motor will be easily damaged by opening the third bridge when starting at high speed against the wind. method, but the hardware cost required by this method is higher

Method used

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Embodiment

[0028] Such as figure 1 As shown, the identification method of the starting state of the motor includes the following steps:

[0029] T1, through the level of the three phases, the conduction level corresponding to the three phases of UVW is obtained, that is, the three signals of Bemf_U, Bemf_V, and Bemf_W;

[0030] T20-T30, according to Bemf_U, Bemf_V, Bemf_W signals to judge the direction of rotation of the motor, that is, according to the direction of the motor and the actual direction of the motor to determine whether it is a downwind start, a headwind start or a static start;

[0031] T21-T31, according to Bemf_U, Bemf_V, and Bemf_W, the time for the motor to rotate a circle can be obtained, and the starting frequency can be obtained by calculating the rotation period of the motor, that is, the starting period.

[0032] Specifically, such as figure 2 , Figure 4 As shown, taking the single-resistor sampling of a three-phase brushless DC motor as an example, when the ...

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Abstract

The invention discloses a motor starting state recognition method. The method comprises the following steps of obtaining the three-phase conduction condition of a UVW through the running state of a motor; judging the starting state of the motor according to the high-low level obtained by the three-phase conduction; and according to the period of the high level and the low level obtained by the three-phase conduction, obtaining the rotating speed of the motor by combining an upper program of a microprocessor. By adoption of the motor starting state recognition method, the state of the motor before starting and the current rotating speed of the motor can be recognized effectively, so that the problem that the motor cannot be normally started or the starting success rate is low in an upwind state is effectively solved, and the problems that due to the fact that starting fails, frequent starting is caused, the abrasion of the motor is serious, the service life is shortened and the like areavoided; and the method is simple, the accuracy is high, and the success rate and reliability of system starting are effectively improved.

Description

technical field [0001] The invention relates to the technical field of DC brushless motors, in particular to a method for identifying the starting state of a motor. Background technique [0002] In the motor control system, for different states before the motor starts, different starting methods can be adopted to realize the normal start of the motor. For example, when the motor is in a static state when starting, the motor can be started to run according to the normal starting voltage; In the downwind starting state, the starting voltage can be lower than the normal starting voltage; when the motor is starting in the headwind starting state, the starting voltage can be greater than the normal starting voltage. [0003] However, in the DC brushless motor scheme, it is difficult to accurately judge the state of the motor at startup and the speed at startup, so it is difficult to adopt a corresponding startup method for the state of the motor at startup. In the prior art, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P6/20
CPCH02P6/18H02P6/20H02P2203/03
Inventor 郑灿
Owner 上海肖可雷电子科技有限公司
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