Inductive brushless direct current motor drive method
A technology of brushed DC motor and driving method, which is applied in the direction of electronically commutated motor control, single motor speed/torque control, electrical components, etc., and can solve problems such as increased noise, decreased qualified rate of motor production, and position deviation of Hall elements. , to achieve the effect of improving reliability, improving yield rate, and reducing the influence of position error
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Embodiment 1
[0043] Such as Figure 1~6 As shown, the driving system of the present invention is composed of the coil of the motor and an H-type single-phase drive bridge, wherein the H-type single-phase drive bridge is composed of field effect transistor MOT1, field effect transistor MOT2, field effect transistor MOT3 and field effect The tube MOT4 is composed together, that is, the field effect tube MOT1 is connected in series with the field effect tube MOT3, the field effect tube MOT2 is connected in series with the field effect tube MOT4, and the drains D of the field effect tube MOT1 and the field effect tube MOT2 are jointly connected with the input voltage Vdd The source S of the field effect transistor MOT3 and the field effect transistor MOT4 is connected and grounded. The bridge point (i.e. the connection point) between the field effect transistor MOT1 and the field effect transistor MOT3 and the bridge point (i.e. the connection point) between the field effect transistor MOT2 an...
Embodiment 2
[0067] Embodiment 1 is to judge the conversion process between the sensory and non-sensory driving modes of the present invention according to the motor speed, and this embodiment is to determine the conversion between the sensory and non-sensory driving modes according to the PWM duty cycle control voltage The process, that is, the first embodiment uses the motor speed to adjust the starting mode, while the present embodiment uses the PWM control voltage to adjust.
[0068] Such as Figure 7-9 as shown, Figure 8 , Figure 9 The waveforms of the driving voltage when the duty cycle of the PWM in the driving area is 100% and 50% are respectively shown. The driving current formed by this method is naturally optimal.
[0069] Its specific process is as Figure 9 As shown, the following steps are involved:
[0070] (1) After turning on the power, the system automatically enters the sensored motor start mode, and then operates in the sensored drive mode;
[0071] (2) The syste...
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