How do electric bicycles have brush and brushless motors?

How do electric bicycles have brush and brushless motors?

Brushed motor, this motor is reversible. The angles of all the windings are fixed and phased by the brush. In order to reduce the difficulty in manufacturing the armature, the three sets of coils are connected in parallel, and all are 3N in the future, that is, the angular interval of each coil is 120 degrees. It is not difficult to use this kind of motor to generate electricity, but Xiaobian does not know how the questioner wants to use it. Where is it used? This kind of motor power generation will increase with the increase of the speed. If the speed exceeds a certain value, phase-to-phase arcing will occur. If the speed is stable, a stable DC output can be obtained by adding a bridge rectifier circuit.

Brushless motors, as the name implies, have no brush commutation, and the commutation of the motor is phase-shifted by the Hall element sensing magnet. Such a motor cannot be used directly for power generation because the commutation circuit has unidirectional conductivity. If you ignore the phase control signal line of the brushless motor, it will cause the motor coil to short-circuit until the motor coil is burnt. The brushless motor wants to generate electricity and must be modified. First, the control signal line is removed, and the communication and switching relationship between the coils is changed by the electronic circuit. But this cost is not small.

Electric vehicles have the function of anti-charging. Some people want to be able to recover the brake power to generate electricity, yes. However, when the power is off, you can feel almost no obvious motor braking effect. The main brake is still by the brakes. During the braking process, although the motor is in the power generation state, the switching time is short due to the rotation speed problem. (Refer to the effect of motor braking when going downhill in the case of high-grade and low-level power failure.) In view of the speed of the electric vehicle, it is determined that the braking distance will not be too long. If you want to recover as much energy as possible, increase the motor speed in a short time.

However, the electric vehicle cannot be changed while driving, which requires a separate system to recover energy, and the system should be connected to the walking system by clutching. However, the weight of the equipment required for this part of the energy recovered greatly depletes the energy loss during normal driving.

It will be 3N in the future, which means that the angular spacing of each coil is 120 degrees. It is not difficult to use this kind of motor to generate electricity, but Xiaobian does not know how the questioner wants to use it. Where is it used? This kind of motor power generation will increase with the increase of the speed. If the speed exceeds a certain value, phase-to-phase arcing will occur. If the speed is stable, a stable DC output can be obtained by adding a bridge rectifier circuit. If there is no rectifier voltage regulator circuit

According to the left-hand rule and the right-hand rule, the direction of the coil current is correct. However, the motor does not stop rotating as it stops, it will always rotate and output power. The reason is that the current that causes the coil of the motor to be subjected to the ampere force is generated by the applied electromotive force. When an external electromotive force is forced to cause the coil current to flow in one direction, the electromotive force generated by the electromagnetic induction at this time has a tendency to weaken the coil current. It is never possible to overcome the addition of electromotive force, otherwise there will be an ideal state without any energy loss.

Some people want to be able to recover the brake power to generate electricity, yes. However, when the power is off, you can feel almost no obvious motor braking effect. The main brake is still by the brakes. During the braking process, although the motor is in the power generation state, the switching time is short due to the rotation speed problem. (Refer to the effect of motor braking when going downhill in the case of high-grade and low-level power failure.) In view of the speed of the electric vehicle, it is determined that the braking distance will not be too long. If you want to recover as much energy as possible, it must be improved in a short time. Motor speed

Position sensor and other components. Brushless DC motors are characterized by brushless, semiconductor switching devices (such as Hall elements) for electronic commutation, that is, electronic switching devices replace traditional contact commutators and brushes. It has the advantages of high reliability, no commutation spark, and low mechanical noise. The position sensor commutates the current of the stator windings in a certain order according to changes in rotor position.

Combined with brushed DC characteristics, it can be used for reversible operation of power generation, and the generated electricity is DC. Its output voltage is comparable to the rated input voltage when the motor is running.

When generating electricity, the rotor of the motor is wound with an electromagnetic coil and connected to the outside through a commutator. Cutting magnetic lines of force when the rotor coil makes a rotational motion on the circumference of the stator

 

 

 

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