Performance parameter code, expressed in two-digit Arabic numerals
Product name code, with capital Chinese alphabet for seat number, shell diameter (mm) for
Product Name Code
SYT: Ferrite Permanent Magnet DC Servo Motor
SYX: Rare Earth Permanent Magnet DC Servomotor
SXPT: Ferrite Permanent Magnet Wire-wound DC Motor
SXPX: Rare Earth Permanent Magnet Wire-wound DC
SWT: Ferrite Permanent Magnet Brushless DC Servo Motor
SWX: Rare Earth Permanent Magnet Brushless DC Servomotor
SN: Printed Winding DC Servo Motor
SR: Switched Reluctance Motor
YX: Three-phase Asynchronous Motor
Electric vehicle motor is a component that converts battery energy into mechanical energy and drives electric vehicle wheels to rotate. The stator is the non-rotating part of a brushless or brushless motor. The motor shaft of hub type brushless or toothless motor is called stator, which can be called inner stator motor. The rotor is the part that rotates when the brushless or brushless motor works. The outer shell of hub brushless or toothless motor is called rotor, which can be called external rotor motor. Carbon brush is a kind of brush motor which is placed on the surface of commutator. When the motor rotates, it transfers electric energy to the coil through the commutator. Because its main component is carbon, called carbon brush, it is easy to wear. Maintenance and replacement should be carried out regularly and carbon deposits should be cleaned up. The brush holder is a mechanical guide groove which is installed in the brush motor and keeps the position of the carbon brush. In the brush motor, the commutator has strip metal surface with mutual insulation. When the motor rotates, the strip metal contacts the positive and negative poles of the brush alternately, realizing the alternating change of the current direction of the motor coil and completing the commutation of the brush motor coil. Magnets are commonly used as magnetic materials with high magnetic field strength. Neodymium iron boron rare earth magnets are used in electric locomotive motors. When the motor works, the coil and commutator rotate, the magnetic steel and carbon brush do not rotate, and the alternating change of coil current direction is completed by the commutator and brush which rotate with the motor. In the electric vehicle industry, brush motors are divided into high-speed brush motors and low-speed brush motors. There are many differences between brushless motor and brushless motor. It can be seen from the name that brushless motor has carbon brush and brushless motor has no carbon brush. Brushless motor is the alternating change of coil current direction provided by the controller in different current directions. There is no brush and commutator between the rotor and stator of the brushless motor. The efficiency of the motor is the ratio of the mechanical energy output by the motor to the electric energy supplied by the power supply. Use the letter. The direct cause of motor heating is caused by high current. Generally, it may be caused by short circuit or open circuit of coil and low efficiency of motor in magnetic steel demagnetization. Normally, the motor runs for a long time with high current.
Nowadays, electric bicycles can be divided into three categories. 1. DC wheelstock motor, including brush motor, two lead-out wires and external PWM controller. 2. AC hub motor, with or without Hall sensor, more than three leads, external frequency conversion controller. 3. DC brushless hub motor with electronic commutator and two lead wires. External PWM controller. Be sure to distinguish and not be confused.
According to the different use environment and frequency, the form is also different. Different types of motors have different characteristics. At present, permanent magnet DC motor is widely used in electric vehicle motors. The so-called permanent magnet motor refers to the motor coil using permanent magnet excitation, not coil excitation. This saves the energy consumed when the excitation coil works and improves the electromechanical conversion efficiency of the motor. For the electric vehicle with limited energy on board, it can reduce the driving current and extend the range.
Permanent magnet DC motor: composed of stator pole, rotor, brush, shell, etc.
The stator pole is made of permanent magnet (permanent magnet), including ferrite, Al-Ni-Co, Nd-Fe-B and other materials. According to its structural form, it can be divided into cylinder type and tile type.
The rotor is usually made of silicon steel laminated. The enameled wire is wound between the two grooves of the rotor core (three grooves are three windings). The joints are welded on the metal sheets of the commutator respectively.
Brush is a conductive component connecting power supply and rotor winding. It has two properties of conductivity and wear resistance. Permanent magnet motor brushes use single metal sheet or metal graphite brushes, electrochemical graphite brushes.
In the electric bicycle industry, motor generally refers to motor assembly, including motor center, deceleration mechanism, etc. Next we talk about the electric bicycle refers to the motor assembly.
I. Disassembly of Electric Machines
Before disassembling the motor, the lead of the motor and the controller should be unplugged. At this time, the one-to-one correspondence between the lead color of the motor and the lead color of the controller must be recorded. The site should be cleaned before opening the motor end cap to prevent sundries from being absorbed on the magnets in the motor. Mark the relative position of end cover and hub. Note: Be sure to loosen the screw diagonally so as not to deform the motor housing. The radial clearance between motor rotor and stator is called air clearance. The air clearance of general motor is between 0.25 and 0.8 mm. When the motor is disassembled and the motor fault is eliminated, the original end cover mark must be assembled so as to prevent the phenomenon of chamber sweeping after secondary assembly.
2. Lubrication of Internal Gears of Electric Machines
If the noise of the brushed hub motor and the brushless hub motor starts to increase, or if the gears in the motor are replaced, all the teeth of the gear should be coated with grease, generally using No. 3 grease or factory.