Abstract: Utilizing an asymmetric magnetic field caused by a mechanism design between a motor rotor and a stator to induce a BEMF, a method for starting a fixed rotation direction of single-phase sensorless DC brushless motor, includes: power-on starting a motor control circuit; if the motor is not in a rotating state before starting the excitation, executing a static starting procedure; then, if the motor rotation direction conforms to a predetermined direction, executing a normal driving procedure; otherwise, executing a static starting procedure. The static starting procedure, by discharging remnant energy of the motor, achieves the purpose of star-up by performing the steps of first phase excitation, stop excitation, and strong second phase excitation. In the normal driving procedure, the slope of BEMF signal of the first phase or the second phase is taken out periodically to detect the motor rotation direction.

Abstract: The invention utilizes an asymmetric magnetic field caused by a mechanism design between a motor rotor and a stator to induce a BEMF, and discloses a method for starting a fixed rotation direction of single-phase sensorless DC brushless motor, including: power-on starting a motor control circuit; if the motor not in the rotating state before starting the excitation, executing a static starting procedure; then, if the motor rotation direction conforming to the predetermined direction, executing a normal driving procedure; otherwise, executing a static starting procedure. The static starting procedure, after of static starting by discharging remnant energy of the motor, achieves the purpose of star-up by performing the steps of first phase excitation, stop excitation, and strong second phase excitation. In the normal driving procedure, the slopes of BEMF signal of the first phase or the second phase is taken out periodically to detect the motor rotation direction.

Abstract: The invention discloses a driving method for single-phase DC brushless motor using sensor only in start-up, comprising: power-up to activate a motor control circuit of a motor; confirming whether the motor is in a rotating state before activation of an excitation? If not, executing a static start-up procedure of using a sensor to detect magnetic poles of the rotor; calculating slope of the BEMF signal to determine the rotation direction of the motor; determining whether the rotation direction of the motor conforming to a predetermined direction; if yes, executing a normal driving procedure; otherwise, executing the static start-up procedure of using a sensor to detect magnetic poles of the rotor. The invention utilizes the present invention utilizes an asymmetric magnetic field caused by a mechanism between a rotor and a stator of a motor to induce a back electromotive force signal and a sensor detection to control rotation direction.

Abstract: A service requirement analysis system includes a service provider database and an analysis server. The service provider database stores multiple service provider data entries, and is connected to a client device. The analysis server receives a service requirement string, and performs segmentation and filtering to obtain requirement keywords. The correlation values quantifying semantic relatedness between any two of the requirement keywords are calculated to construct a requirement keyword connected graph for dividing the requirement keywords into one or more requirement keyword groups associated with one or more concepts in the service requirement string. A semantic hierarchical structure of each of the requirement keyword groups is constructed for searching the service provider database to obtain service provider data entries matching the service requirement string. The matched entries are displayed on the client device.

Abstract: A next generation sequencing analysis system and a next generation sequencing analysis method thereof are provided. The next generation sequencing analysis system receives a target gene input, and decides at least one gene group of the target gene input based on gene related information stored in a gene database.

Abstract: A service requirement analysis system includes a service provider database and an analysis server. The service provider database stores multiple service provider data entries, and is connected to a client device. The analysis server receives a service requirement string, and performs segmentation and filtering to obtain requirement keywords. The correlation values quantifying semantic relatedness between any two of the requirement keywords are calculated to construct a requirement keyword connected graph for dividing the requirement keywords into one or more requirement keyword groups associated with one or more concepts in the service requirement string. A semantic hierarchical structure of each of the requirement keyword groups is constructed for searching the service provider database to obtain service provider data entries matching the service requirement string. The matched entries are displayed on the client device.