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Home » BLDC Motor FAQ » Frequently Asked Questions (FAQ) about BLDC Motor
Frequently Asked Questions (FAQ) about BLDC Motor
Q: Why does the BLDC motor need the controller?
A: Since there is no electric brush and commutator between the stator and rotor between the BLDC motor, the controller provides the direct current from different current directions to realize alternation of the current direction of the coil within the electric motor.
Q: Why does the BLDC motor have three Hall sensors?
A: For the BLDC motor to rotate, the magnetic field of the stator coil and the magnetic field of the rotor’s permanent magnet should constitute certain angle. The rotor’s transmission process is a process in which the direction of the rotor’s magnetic field changes. In order to ensure certain angle between the magnetic field of the two, when the angle reaches certain value, the magnetic field direction of the stator coil should change. Then, how can one judge the necessity of changing the direction of the stator magnetic field? The three Hall sensors can help. The three Hall sensors is responsible for telling the controller when to change the current direction.
Q: What is the general scope of power consumption of the high torque BLDC motor?
A: The power consumption of the high torque BLDC motor generally ranges from 6mA to 20mA.
Q: How does the BLDC motor realizes phase shift?
A: When the brushless motor is rotating, the electrification direction of the coil within the electric motor requires alternation, thus ensuring sustainable rotation of the electric motor. The phase shift is finished by the BLDC motor.
Q: Under which temperature can the BLDC motor work normally? What is the upper limit of the temperature for the electric motor?
A: If the temperature of the electric motor cover is higher than the ambient temperature by more than 25°, it means that the temperature rise of the electric motor has exceeded the normal scope. Generally, the electric motor’s temperature rise should be controlled under 20°. The electric motor coil is wrapped by the enameled wire. However, the paint film of the enameled wire will drop when heating under the temperature of around 150°, thus causing the short circuit of the coil. When the coil temperature is above 150°, the BLDC motor shell will reach the temperature of around 100°. Based on the shell temperature, the BLDC motor can stand the highest temperature of 100°at most.
Q: Why is it that any BLDC motor controller and electric motor cannot be arbitrarily connected to ensure normal rotation and that the BLDC motor will cause inversion of the phase sequence?
A: Generally, the BLDC motor will undergo the following process in the actual movement process. The electric motor rotates→The rotor’ s magnetic field direction is changed→included angle between the stator’s magnetic field and the rotor’s magnetic field reaches the electricity angle of 60°→Hall signals are changed→current direction of the phase wire is changed→stator magnetic field spans forward by the electricity angle of 60°→included angle between the stator’s magnetic field and the rotor’s magnetic field reaches the electricity angle of 120°→electric motor rotates continuously.
In this way, we know that the Hall sensor has six correct states. When one Hall sensor informs the controller, the controller will be in a specific phase line output state. Therefore, inversion of the phase sequence is to finish the following task—to make the electricity angle of the stator to move at the rate of 60°.
A: Since there is no electric brush and commutator between the stator and rotor between the BLDC motor, the controller provides the direct current from different current directions to realize alternation of the current direction of the coil within the electric motor.
Q: Why does the BLDC motor have three Hall sensors?
A: For the BLDC motor to rotate, the magnetic field of the stator coil and the magnetic field of the rotor’s permanent magnet should constitute certain angle. The rotor’s transmission process is a process in which the direction of the rotor’s magnetic field changes. In order to ensure certain angle between the magnetic field of the two, when the angle reaches certain value, the magnetic field direction of the stator coil should change. Then, how can one judge the necessity of changing the direction of the stator magnetic field? The three Hall sensors can help. The three Hall sensors is responsible for telling the controller when to change the current direction.
Q: What is the general scope of power consumption of the high torque BLDC motor?
A: The power consumption of the high torque BLDC motor generally ranges from 6mA to 20mA.
Q: How does the BLDC motor realizes phase shift?
A: When the brushless motor is rotating, the electrification direction of the coil within the electric motor requires alternation, thus ensuring sustainable rotation of the electric motor. The phase shift is finished by the BLDC motor.
Q: Under which temperature can the BLDC motor work normally? What is the upper limit of the temperature for the electric motor?
A: If the temperature of the electric motor cover is higher than the ambient temperature by more than 25°, it means that the temperature rise of the electric motor has exceeded the normal scope. Generally, the electric motor’s temperature rise should be controlled under 20°. The electric motor coil is wrapped by the enameled wire. However, the paint film of the enameled wire will drop when heating under the temperature of around 150°, thus causing the short circuit of the coil. When the coil temperature is above 150°, the BLDC motor shell will reach the temperature of around 100°. Based on the shell temperature, the BLDC motor can stand the highest temperature of 100°at most.
Q: Why is it that any BLDC motor controller and electric motor cannot be arbitrarily connected to ensure normal rotation and that the BLDC motor will cause inversion of the phase sequence?
A: Generally, the BLDC motor will undergo the following process in the actual movement process. The electric motor rotates→The rotor’ s magnetic field direction is changed→included angle between the stator’s magnetic field and the rotor’s magnetic field reaches the electricity angle of 60°→Hall signals are changed→current direction of the phase wire is changed→stator magnetic field spans forward by the electricity angle of 60°→included angle between the stator’s magnetic field and the rotor’s magnetic field reaches the electricity angle of 120°→electric motor rotates continuously.
In this way, we know that the Hall sensor has six correct states. When one Hall sensor informs the controller, the controller will be in a specific phase line output state. Therefore, inversion of the phase sequence is to finish the following task—to make the electricity angle of the stator to move at the rate of 60°.
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