Brushless motor power detection method
A motor power, brushless motor technology, applied in the direction of electric power measurement by applying digital technology, can solve the problem of large motor power error, power supply positive and negative lead resistance can not be ignored, power drive tube or field effect tube power consumption can not be ignored. Completely ignore other problems to achieve the effect of eliminating faults and avoiding burning out the motor
Active Publication Date: 2019-04-16
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 invention is:
[0052] A brushless motor power detection method, using such as figure 1 The motor power detection circuit shown detects and calculates the power value of the motor, and 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 inside of the motor 104 includes motor windings, and the resistor network includes a voltage detection module 105 made up of multiple resistors and capacitors and a sampling resistor R 4 , the inverter 106 includes a first field effect transistor Q 1 , the second FET Q 2 , the third FET Q 3 , the fourth FET Q 4 , the sampling resistor R 4 in series with the second FET Q 2 and the fourth FET Q 2 and ground GND; the main controller 102 includes a main control chip and an analog-to-digital converter located inside the main control chip; the voltage detection module 105 i...
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The invention discloses a brushless motor power detection method. In the prior art, the motor power is calculated by the voltage value at two ends of the motor, that is, the voltage of a power supply,however, when the motor current is large and the power consumption of a power drive tube can not be completely ignored and the resistance of positive and negative lead wires of the power supply can not be ignored, the motor power calculated by the method has large errors. A more accurate detection method is provided: firstly, the voltage instantaneous value at two ends of the motor is detected, the voltage at two ends of a sampling resistor is detected at the same time, the current instantaneous value at two ends of the voltage is further calculated, the power of the motor is calculated according to the voltage instantaneous value and the current instantaneous value, the motor power detected by the detection method eliminates the power consumption of the power drive tube and the resistance of positive and negative lead wires of the power supply, and the motor power detection precision is improved.
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. 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 aforementioned 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 current. Contents of the invention [0004] The invent...
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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