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4 Tips for Applying Hall Sensor to BLDC Motor
The Hall sensor is a sensitive device that is sensitive to light, heat, and mechanical stress, except for magnetic sensitivity. Since the Hall sensor is the most sensitive and the most vulnerable device in the motor, many customers will encounter the problem of burning the Hall sensor. Therefore, in order to avoid damage to the Hall sensor, please pay attention to the following aspects during use:
Adopting Reasonable Peripheral Circuit
Suitable power supply voltage and load circuit are prerequisites for the normal operation of Hall sensors. The power supply voltage of Hall sensors shall not exceed the Vcc specified in the instruction. Most Hall sensors of BLDC motor are OC output switches. Therefore, the output response load resistance RL, RL value depends on the load current IOL size, should not be overloaded. When the motor works, because there is a strong electromagnetic field around the Hall sensor, the related wires will couple the electromagnetic field energy of the space down to the voltage value in the circuit and act as the Hall sensor. Because of the distributed inductance of the conductor in the load circuit, when the triode in Hall sensor is turned on and off, the overvoltage will also be generated due to the current transient in the circuit.
Avoiding Mechanical Stress
Because the mechanical stress will cause the drift of magnetic sensitivity of Hall sensor, the mechanical stress applied to the shell and lead of the device should be minimized in use and installation.
Avoiding Thermal Stress
When the ambient temperature is too high, the semiconductor materials inside Hall sensors will be damaged, resulting in performance deviation or device failure. Therefore, the welding temperature and time must be strictly regulated, and the operating environment temperature of Hall sensors must also meet the requirements of the specification.
Measurement Range and Temperature Calculations
Because Hall sensor is a sensitive device, its magnetic sensitivity drift at high and low temperature is normal. Under normal circumstances, the temperature changes by ±60°C, the temperature drift should be no more than 30 GS (high temperature devices are not more than 15 GS). Therefore, in the design of the magnetic circuit, a certain magnetic sensitivity margin should be released, that is, the magnetic field strength acting on the surface of the device should be higher than the actual BH-L50GS.
Adopting Reasonable Peripheral Circuit
Suitable power supply voltage and load circuit are prerequisites for the normal operation of Hall sensors. The power supply voltage of Hall sensors shall not exceed the Vcc specified in the instruction. Most Hall sensors of BLDC motor are OC output switches. Therefore, the output response load resistance RL, RL value depends on the load current IOL size, should not be overloaded. When the motor works, because there is a strong electromagnetic field around the Hall sensor, the related wires will couple the electromagnetic field energy of the space down to the voltage value in the circuit and act as the Hall sensor. Because of the distributed inductance of the conductor in the load circuit, when the triode in Hall sensor is turned on and off, the overvoltage will also be generated due to the current transient in the circuit.
Avoiding Mechanical Stress
Because the mechanical stress will cause the drift of magnetic sensitivity of Hall sensor, the mechanical stress applied to the shell and lead of the device should be minimized in use and installation.
Avoiding Thermal Stress
When the ambient temperature is too high, the semiconductor materials inside Hall sensors will be damaged, resulting in performance deviation or device failure. Therefore, the welding temperature and time must be strictly regulated, and the operating environment temperature of Hall sensors must also meet the requirements of the specification.
Measurement Range and Temperature Calculations
Because Hall sensor is a sensitive device, its magnetic sensitivity drift at high and low temperature is normal. Under normal circumstances, the temperature changes by ±60°C, the temperature drift should be no more than 30 GS (high temperature devices are not more than 15 GS). Therefore, in the design of the magnetic circuit, a certain magnetic sensitivity margin should be released, that is, the magnetic field strength acting on the surface of the device should be higher than the actual BH-L50GS.
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