Motor control circuit and method as well as brushless motor system

A motor control and circuit technology, applied in the field of motor control circuits, brushless motor systems, and motor control methods, can solve the problems of inconvenience, general products and methods without suitable structures and methods, etc.
CN101257271AActive Publication Date: 2008-09-03PROLIFIC TECH INC
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
PROLIFIC TECH INC
Publication Date
2008-09-03

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Abstract

The invention relates to a motor control circuit and a brushless motor system, and provides a motor control method, circuit and brushless motor. The motor includes a three-phase coil, the first terminal of each coil is coupled at a node jointly. The method includes: when no current go through a first specific coil in the three-phase coil, and when the current flows from the second terminal of the second specific coil to the second terminal of the third specific coil, detecting the voltage at the second terminal of the first specific coil as a first appointment voltage; detecting the potential drop of the DC sensing resistor as a second appointment voltage; estimating the zero-cross point by the first appointment voltage, the second appointment voltage and the DC voltage supplied to the motor so as to control the motor. The invention is capable of detecting the zero-cross point of the motor in the PWM-off state, which further controls the phase change of motor, in addition, the invention can detect the zero-cross point by conjunction with PWM-off, thereby decreasing the phase change error, which is very practical.
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Description

technical field

[0001] The invention relates to a motor control technology, in particular to a motor control method, a motor control circuit and a brushless motor system. Background technique

[0002] Adjustable speed motors are widely used in factory automation systems, ventilation systems, air conditioning systems, etc. The known adjustable speed motor is a motor in the form of a brush, and a brush-commutator is arranged on this motor. For the past century, commutation in brushed motors has been accomplished by graphite brushes touching an annular commutator mounted on the runner. However, the above-mentioned brushed motor is relatively bulky, generates a lot of noise during operation, and has low efficiency. With the advancement of technology, some people have developed a brushless motor (Brushless-Motor), and benefited from the advancement of design and material technology, its price has dropped sharply. Today, the cost difference between the two motor technologies is...

Claims

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