Commutation method suitable for large-power sensor-free DC brushless motor
A brushless DC motor and sensor technology, applied in the direction of electronically commutated motor control, electrical components, control systems, etc., can solve the problems of high cost and low reliability, and achieve the effect of avoiding false detection and simple and reliable methods
Inactive Publication Date: 2018-09-25
MIANYANG WEIBO ELECTRONICS
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[0006] The invention provides a sensorless DC brushless motor phase commutation method suitable for high power, solves the existing technical problems of low reliability or high cost at high power, and realizes accurate detection during normal operation To the zero-crossing point of the actual floating phase back EMF; during high-power operation, it can more accurately estimate the actual zero-crossing point of the floating opposite electric potential and avoid false detection; the method is simple and reliable, and does not need to occupy too many software resources, and does not require additional hardware resources
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[0023] The invention provides a sensorless DC brushless motor phase commutation method suitable for high power, solves the existing technical problems of low reliability or high cost at high power, and realizes accurate detection during normal operation To the zero-crossing point of the actual floating phase back EMF; during high-power operation, it can more accurately estimate the actual zero-crossing point of the floating opposite electric potential and avoid false detection; the method is simple and reliable, and does not need to occupy too many software resources, and does not require additional hardware resources .
[0024] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the condition of not conflicting with each other, the embodiments of the...
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The invention discloses a commutation method suitable for a large-power sensor-free DC brushless motor. The method comprises that a dead zone period in which the back electromotive force of a suspension phase is not detected is set after commutation of certain phase, the zero crossing point of the back electromotive force of the suspension phase is collected periodically after the dead zone period, and a zero crossing point time tcc of the back electromotive force is pre-estimated; when the rising edge of the back electromotive force of the suspension phase is detected, 30-degree commutation is carried out by taking the present tcc as the practical zero crossing point when the tcc is lower than time tb of a present period; when the falling edge of the back electromotive force of the suspension phase is detected, 30-degree commutation is carried out by taking the present tcc as the practical zero crossing point when the tcc is greater than time ta of a last period; the zero crossing point of the back electromotive force of the practical suspension phase can be detected accurately during normal operation; the zero crossing point of the back electromotive force of the practical suspension phase can be estimated relatively accurately during large-power operation; and the method is simple and reliable needless of occupying much software resources or extra hardware resources.
Description
technical field [0001] The invention relates to the field of phase commutation of a DC brushless motor, in particular to a sensorless DC brushless motor phase commutation method suitable for high power. Background technique [0002] Brushless DC motors are widely used in various fields such as industrial automation, agricultural automation, modernization of weapons and equipment, office automation, home modernization, automotive electronics, etc. With the continuous improvement of people's living standards and the continuous development of brushless DC motors, brushless DC motors The miniaturization of the motor has become an inevitable development trend. Sensorless DC brushless motors are often used in some high-power (high-speed and heavy-load) applications due to their advantages of easy installation and high reliability. Effective measures are urgently needed to ensure their reliability during high-power operation. [0003] A method is known to commutate by directly det...
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IPC IPC(8): H02P6/182
CPCH02P6/182
Inventor 张强陈志锦刘必标许永衡李正丽葛俊佐
Owner MIANYANG WEIBO ELECTRONICS