A method for detecting the power of a brushless motor
A technology for motor power and power detection, which is applied in the direction of electric power measurement by applying digital technology, can solve the problem of large motor power error, power consumption of power drive tube or field effect tube cannot be completely ignored, and resistance of positive and negative lead wires of power supply cannot be completely ignored. Neglect and other problems to achieve the effect of troubleshooting, avoiding burning out the motor, and eliminating errors
Active Publication Date: 2022-06-07
蓝海智能技术(杭州)有限公司
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Problems solved by technology
[0002] At present, most motor detection modules only detect the instantaneous value of the motor current. The default voltage value at both ends of the motor is the power supply voltage to calculate the motor power. However, when the motor current is large, the power consumption of the power drive tube or field effect tube It cannot be completely ignored, and the resistance of the positive and negative lead wires of the power supply cannot be ignored. At this time, the error of the motor power calculated according to the above method is relatively large.
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[0051] An embodiment of the present invention is:
[0052] A brushless motor power detection method, using such as figure 1 The shown motor power detection circuit detects and calculates the power value of the motor. The motor power detection circuit includes a drive circuit 101, a main controller 102, a Hall sensor 103, a motor 104, an inverter 106, a resistor network, and a power supply Vin , ground GND, the motor 104 includes motor windings, and the resistance network includes a voltage detection module 105 composed of multiple resistors and capacitors and a sampling resistor R 4 , the inverter 106 includes a first FET Q 1 , the second FET Q 2 , the third FET Q 3 , the fourth FET Q 4 , the sampling resistor R 4 connected in series with the second FET Q 2 and the fourth FET Q 4 between ground GND; the main controller 102 includes a main control chip and an analog-to-digital converter inside the main control chip; the voltage detection module 105 is connected in parall...
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The invention discloses a method for detecting the power of a brushless motor. In the prior art, the motor power is calculated by the voltage value at both ends of the motor, that is, the power supply voltage. However, when the motor current is large, the power consumption of the power drive tube cannot be completely ignored. And when the positive and negative lead wire resistances of the power supply cannot be ignored, the error of the motor power calculated according to this method is relatively large; the present invention provides a more accurate detection method, which first detects the instantaneous value of the voltage at both ends of the motor, and simultaneously detects the Voltage, further calculation to obtain the instantaneous value of current at both ends of the voltage, and calculate the power of the motor according to the instantaneous value of voltage and current. Accuracy of motor power.
Description
technical field [0001] The invention relates to the field of real-time detection of motors, in particular to a power detection method of a brushless motor. Background technique [0002] At present, most motor detection modules only detect the instantaneous value of the motor current. By default, the voltage value at both ends of the motor is the power supply voltage to calculate the motor power. However, when the motor current is large, the power consumption of the power drive tube or FET It cannot be completely ignored, and the resistance of the positive and negative leads of the power supply cannot be ignored either. At this time, the error of the motor power calculated according to the above method is relatively large. [0003] In order to improve the accuracy of detecting the motor power, the present invention calculates the motor power by detecting the instantaneous value of the motor voltage and the instantaneous value of the current. SUMMARY OF THE INVENTION [000...
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IPC IPC(8): G01R21/133
CPCG01R21/133
Inventor 张磊
Owner 蓝海智能技术(杭州)有限公司