★Why can't any BLDC controller and BLDC motor be connected at will to rotate normally? Why does the brushless DC have a phase sequence reversal?
Answer: Generally speaking, the brushless DC motor is such a process in actual motion: the motor rotates—the direction of the rotor magnetic field changes—when the angle between the direction of the stator magnetic field and the direction of the rotor magnetic field reaches an electrical angle of 60 degrees— ---Hall signal change----The direction of phase line current changes----The stator magnetic field crosses 60 degree electrical angle forward----The included angle between the stator magnetic field direction and the rotor magnetic field direction is 120 degree electrical angle--- - The motor continues to turn. So we understand that Hall has six correct states. When a specific Hall tells the controller, the controller has a specific phase output state. So the phase reversal sequence is to complete such a task, that is, to make the electrical angle of the stator always step by 60 degrees in one direction.
★What happens if a 60-degree brushless controller is used on a 120-degree brushless motor? What about the other way around?
Answer: It will fall to the phenomenon of lack of phase and cannot rotate normally; but the controller used by Jieneng is an intelligent brushless controller that can automatically identify 60-degree motor or 120-degree motor, so that it can be compatible with two kinds of motors. Makes maintenance and replacement more convenient.
★How can the DC brushless controller and DC brushless motor pour out the correct phase sequence?
Answer: The first step is to ensure that the power and ground wires of the Hall wire are well connected with the corresponding wires on the controller. There are 36 ways to connect the three motor hall wires and the three motor wires to the controller. The simple and stupid way is to try each state one by one. When switching, it can be carried out without interruption, but it must be carefully and in a certain order. Be careful not to twist too much each time. If the motor does not rotate smoothly, this state is not right. If the handle is twisted too much, it will damage the controller. If it reverses, know the phase sequence of the controller. In the case of the controller, the Hall lines a and c of the controller are exchanged, and the phase A and B of the click line are exchanged with each other, and the reverse rotation can be reversed. Finally, the correct way to verify the connection is that it is normal during high current operation.
★How to control 60 degree motor with 120 degree brushless controller?
Answer: A direction line can be added between the b-phase of the hall signal line of the brushless motor and the sampling signal line of the controller.
★What is the intuitive difference between a brushed high-speed motor and a brushed low-speed motor?
Answer: A. The high-speed motor has an overrunning clutch, which is easy to turn in one direction and exhausted in the other direction; the low-speed motor is equally easy to turn the bucket in both directions.
B. The high-speed motor makes a lot of noise when the car rotates, and the low-speed motor makes less noise. It is easy for an experienced person to identify by ear.
★What is the rated running state of the motor?
Answer: When the motor is running, if each physical quantity is the same as its rated value, it is called the rated running state. When working under the rated running state, the motor can run reliably and has the best comprehensive performance.
★How is the rated torque of the motor calculated?
Answer: The rated torque output on the click axis can be represented by T2n, which is the rated value of the output mechanical power divided by the rated value of the transfer speed, that is, T2n=Pn where the unit of Pn is W, and the unit of Nn is r/min 、 The unit of T2n is N.M, if the unit of PNM is KN, the coefficient 9.55 is changed to 9550.
Therefore, it can be concluded that if the motor's rated power is equal, the lower the motor's speed, the greater the torque.
★How is the starting current of the motor defined?
Answer: It is generally required that the starting current of the motor should not exceed 2~5 times of its rated current, which is also an important reason for the current limiting protection on the controller.
★Why are the motor rotation speeds on the market getting higher and higher? and what impact?
A: The supplier can increase the speed to reduce the cost. It is also a low-speed click. When the speed is high, the number of coil turns will be reduced, and the silicon steel sheet will be saved, and the number of magnetic steel will be reduced. The buyer thinks that the high speed is good.
When working at the rated speed, its power remains unchanged, but the efficiency is significantly lower in the low-speed area, that is, it is powerless to start.
The efficiency is low, it needs to be started with a large current, and the current is also large when riding, which requires a large current limit of the controller and is not good for the battery.
