The characteristics of cars are characterized by frequent start, acceleration, deceleration, parking, etc.High torque is required at low speeds or climbing, and low torque is required when driving at high speeds.The characteristics of the changing cars have high requirements for motor performance. Below, lets take a look at the performance requirements of the car motor to meet.
Daily maintenance of car motor
1. The wiring of the motor: The four cable markers of the motor are as follows: the end of the A1 — The ECG Winding, the end of the A2 ——MAC Winding, the D1 (D3) — Strings of StringsWind end.D2 and A1 are connected, and the motor can be rotated between D1 and A2.If you want to return to any set of pairs of D1, D2 or A1, A2, it can be achieved.
2. There are 4 inspection windows on the electrocomputers for observation and maintenance of wiper and replacement of electric brushes.
3. The minimum allowable insulation resistance of the motor is (250V megaou table): The motor below 45 volt is 0.5MΩ, and the 45-100V motor is 1 MΩ.
4. If necessary, the brush should be replaced between the small groove between the small groove and the surface of the directioner.
5. The motor is not allowed to start at high speed.
6. Regularly open the 100 -page window inspection or whether the brush is normal and the brush is normal.
Common faults in car motors
1 Common fault in automobile generators -not charging
When the engine is above medium or above, the current meter pointer indicates that the indicator is not charged, and the charging indicator lights are on. First of all, consider the battery charging.
In addition to the loosening and slipping of the transmission belt, it is generally necessary to check that the generator itself does not generate electricity or the regulator failure, and the charging circuit disconnection failure.For example, the internal current of the generator or the bottom of the electrode wiring column is not connected with the diode component plate; the diode breaks through the short circuit to cause the stator winding;
Improve the engine rotation in the diagnosis; turn on the headlight, if the current deflection discharge direction of the current meter pointer is normal for the generator and the regulator, but the battery charging is sufficient;The machine or regulator should check whether the joints of the charging line should be good, whether the fan belt is too loose, the technical condition of the generator and the regulator.First verify whether the charging system does have a failure, and place the engine at medium speed. When the front light is turned on, the current meter pointer is biased towards the "+" direction or keeps the place.If the current table pointer is biased towards the "one" direction, there is a failure for the charging system, and it should be maintained.
2 Common faults in automobile generators -the charging current is too small
When the battery is insufficient, the engine speed is improved, and the current meter pointer indicates a small charging current, which is a small failure of the charging current.This is generally caused by insufficient voltage of the generator itself, poor technical status of the regulator, and increased resistance in the charging line.
It can be judged and excluded according to the following steps: Check whether the cord pillars and its wire connection of batteries, generators, regulators, and current meters are reliable.Check whether the fan belt is too loose and make the generator speed.When the above situation is normal, the limited voltage of the regulator can be checked under the mid -speed speed of the engine, and the disassembly of the generator has abnormal wear and damage.Check whether the tentacles of the regulator activity are obscured or there are oxygen, whether the activity contact arm and iron core gap and spring pulling force meet the technical requirements; the regulator wiring is loose.Finding abnormal phenomena should be repaired in time.When the engine runs above the medium speed, the front lights are connected. If the current still displays charging, it is good for the technical condition of the charging system; if the power table displays the discharge, the charging current is too small, and it should be maintained.
3 Common faults in automobile generators -too large charging current
The car current meter pointer is turned to the maximum charging current position; if the speed of the engine is high at night, the lighting and the instrument indicator will appear particularly bright.The bulb is easy to burn, the electrical contacts are obscured, and the battery electrolyte is consumed too fast.First check whether the tuning device fire line and the magnetic field two -wire wiring wires are error -connected, whether the activity contacts are obscured or adhered to the normal closed state.When checking the regulator, the magnetic field wiring can be removed. If the charging current is significantly reduced, it may be a regulator failure. It may be that the low -speed contact sintering is not open, and the coil has a disconnection. If the charging current is still large, it may be the magnetic field wiring and the magnetic field wiring andThere is a short circuit in the systemic wiring.First check whether the charging current is too large due to short circuit and severe power in the battery.
4 Common faults in automobile generators -unstable charging current
When the engine idle speed is running above the speed, the current meter pointer swings left and right to display intermittent charging (sometimes charging and sometimes non -charging). Generally, the end voltage of the generator is unstable.First, check whether each connected line head is loose and poor; whether the belt is too loose and the pole pile of the battery is loose.If there is no abnormality, check whether the contacts of the regulator are meticulous, dirty, and the coils or resistors are poorly exposed to the intercourse, and there is still no abnormality. If there is still no abnormalities, the technical conditions inside the generator should be disassembled and repaired one by one.When the generator runs above the medium speed, the current meter indicates charging, but the pointer continues to swing left and right. The charging current is large and small, and it should be repaired.
5 Common faults in car generators -generators are not generated
The main reason for the generator does not generate is: the rectifier diodes break through short -circuit or disconnection; the excitement winding short -circuit or disconnection; the three -phase stator winding is short -circuit or the iron;Pass in the frame.
Top 10 performance requirements for car motor
(1) High voltage.Within the allowable range, high voltage as much as possible can reduce the size of the motor and the size of the equipment such as the motor, especially the cost of reducing the inverter.The working voltage is increased from THSs 274 V to 500 V of THS B. Under the condition of unchanged size, the maximum power is increased from 33 kW to 50 kW, and the maximum torque is increased from 350 nm to 400onm.It can be seen that the application of high -voltage systems is extremely beneficial to the improvement of automotive power performance.
(2) High speed.The speed of the inductive motor used by electric vehicles can reach 8,000, 12 000 R/min. The size of the high -speed motor is small and the quality is light, which is conducive to reducing the quality of the equipment.
(3) Light quality and small size.Electric motors can reduce the quality of the motor by using aluminum alloy shells and other channels. The materials of various control devices and cooling systems should also be used as light -quality materials.Electric vehicle drive motors require high ratio (output power of the quality of the motor unit) and high efficiency in the wide speed and torque range to achieve the weight reduction and extend the continuous mileage; and the industrial driverElectric motors usually comprehensively consider the power, efficiency, and cost, and optimize efficiency near the rated working point.
(4) The motor should have a large startup torque and a large range of speed regulation performance to meet the power and torque required for starting, acceleration, driving, deceleration, and braking.The motor should have an automatic speed regulation function to reduce the drivers control intensity, improve the comfort of the driver, and can achieve the same control response to the accelerated pedal on the internal combustion engine.
(5) Electric vehicle -driven motor requires 4 to 5 times overload to meet the requirements of accelerating driving and maximum climbing in short -term, and industrial drive motors only require 2 times overload.
(6) Electric vehicle -driven motors should have high controllability, stable accuracy, and dynamic performance to meet the coordinated operation of multiple electric motors, while industrial drive motors only require a certain specific performance.
(7) The motor should have high efficiency, low loss, and can recycle brake energy when the vehicle is decelerated.
(8) The safety and control system safety of the electrical system shall meet the relevant standards and regulations.The working voltage of various power battery packs and motors of electric vehicles can reach more than 300 V, so high -voltage protection equipment must be equipped to ensure safety.
(9) Can work reliably under bad conditions.Electric motors should have high reliability, temperature resistance and moisture resistance, and have low noise during runtime, and can work in a harsh environment for a long time.
(10) Simple structure. Suitable for large quantities, easy to use maintenance, cheap price, etc.

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