Electric vehicle motor maintenance tutorial and explanation of power and principle

The main function of the motor is to generate drive torque as a power source for electrical appliances or various machines. The electric motor's motor provides the power source for the electric vehicle. What should I do if there is a problem with the motor? Any machine failure, we must first understand the principle of the machine, and then deal with the fault. This article will explain the power and principle of electric motor, and provide a motor vehicle maintenance tutorial, I hope to help everyone.

[Electric vehicle motor] electric vehicle motor maintenance tutorial electric vehicle motor power and principle

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Electric motor power and principle

Motors are devices that convert electrical energy into mechanical energy. The electric motor principle is to generate a rotating electric field by using a coiled coil (that is, a stator winding) and to act on a rotor squirrel-cage closed aluminum frame to form a magnetoelectric rotational torque. The electric motor is divided into a direct current motor and an alternating current motor according to the use of the power source. The electric motor in the electric power system is mostly an alternating current motor, and may be a synchronous motor or an asynchronous motor (the stator magnetic field speed of the motor and the rotational speed of the rotor are not kept at the synchronous speed). The motor is mainly composed of a stator and a rotor, and the direction of the force-carrying wire in the magnetic field is related to the direction of the current and the direction of the magnetic induction line (the direction of the magnetic field). The working principle of the motor is that the magnetic field acts on the current to force the motor to rotate.

Electric vehicles with different motor powers are different. For example, the power of four motors with 12AH is 350W. This refers to the high-speed motor with gears inside. If it is a brushless gearless motor, the actual power it is 250W.

Electric car motor repair tutorial

In the case of normal engine conditions, failure of the starter or battery can make the engine difficult to start or even start. In this case, first understand the use of the starter and the battery, in order to roughly determine the fault location. If the battery has been used for more than one year, it should be checked for technical conditions. If the battery is used for a short period of time and the starter has not been repaired for a long time, it should be checked from the starter. Then analyze and process according to the fault phenomenon at startup:

1. When starting, only the “giggle” sound of the electromagnetic switch of the starter is heard, or the starter drives the crankshaft to rotate slowly for a few times, and then the starter electromagnetic switch “giggle” sounds, but the crankshaft does not rotate. This phenomenon generally belongs to the battery "breaking grid" fault.

2. Temporary parking can be started every time, but the parking time is longer or the cranking can only be turned when starting the next day. This phenomenon belongs to the serious self-discharge of the battery, and its plates and separators are seriously aging, indicating that the battery is nearing retirement.

3. When starting, the starter suddenly turns weak, accompanied by burning rubber smell or smoke from the battery. Most of them are pole piles and pole pile clamps are badly contacted and burnt.

4. If the starter drive gear and the engine flywheel ring gear make a idling sound when starting, there are two reasons: one is the deformation of the meshing and cutting plane of the flywheel ring gear; the other is that the gap between the starter drive gear and the flywheel ring gear is too large. . The two cannot mesh and the engine will not start.

5. When the main power switch is turned on, the starter drive gear is meshed with the flywheel ring gear. This kind of failure occurs. First, the holding coil of the starter electromagnetic switch is connected to the power supply terminal. Second, the three wires on the key switch are connected incorrectly. The judgment method is: when the key is in the “0” position, the machine drive gear is started. If it does not turn, start the motor drive gear to rotate with the flywheel ring gear when it is in the "2" position.

6. When the start switch is turned to the start position, the engine cannot be started, and there is no other phenomenon. The fault is that the key and the switch are not connected to the starting circuit due to wear; the second is that the starter relay is not turned on to the starter electromagnetic switch circuit; and the third is that the power switch is not turned on.

7. There is only a slight “beep” at the start, and there is no response. This is caused by the start relay issuing. At this time, just press the tail of the electromagnet and force the electromagnet to move forward, then the starting circuit can be turned on to start the engine.

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