Was established in 1998, is a collection of r & dproduction, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Was established in 1998, is a collection of r &d production, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Our machine including large CNC lathe, CNC machining center, CNC centerless grinding machine, CNC Incisive grinding machine, CNC cylindrical grinding machine, heat treatment machine.
What is a brush motor
When the motor is working, the coil and the commutator rotate, the magnet and the carbon brush do not rotate, and the alternation of the direction of the coil current is accomplished by the commutator and the carbon brush rotating along with the motor. motor shaft A brush motor has a larger force than a brushless motor, with fewer wires and a positive and a negative wire. If the motor is reversed, it can be done by simply swapping the positions of the two wires. In the electric vehicle industry, brush motors are divided into high-speed brush motors and low-speed brush motors. There are many differences between brushed and brushless motors. The easiest way to distinguish between them is as follows: Brushed motors have carbon brushes, and brushless motors do not have carbon brushes. However, there are large brush motor noise, brush motors have been basically eliminated.
What is a brushless motor?
The brushless motor is provided by the controller with DC currents in different current directions to alternate the direction of the coil current in the motor. There is no brush and commutator between the rotor and the stator of the brushless motor.
What is the difference between a brushless motor and a brushed motor?
How brushless motors and brushed motors work
First, the principle of a brush motor
The brush motor adopts mechanical commutation, the magnetic pole does not move, and the coil rotates. When the motor is working, the coil and the commutator rotate, the magnet and the carbon brush do not rotate, and the alternation of the direction of the coil current is accomplished by the commutator and the brush that the motor rotates.
In brushed motors, this process consists of arranging the two power input terminals of each group of coils into a ring, which are separated from each other by insulating materials to form a cylinder-like thing that is integrated with the motor shaft. A small column (carbon brush) made of two carbon elements presses two points on the ring cylinder's power input ring at two specific fixed positions under spring pressure to energize one set of coils.
As the motor rotates, different coils or different two poles of the same coil are energized at different times so that the NS pole of the coil generating a magnetic field and the NS pole of the nearest permanent magnet stator have a suitable angle difference, stainless steel shaft magnetic field anisotropic attraction, and the same sex Repulse, generate power, push the motor to rotate. The carbon electrode slides on the coil terminal, like a brush on the surface of the object, so it is called a carbon “brush”.
Sliding each other will rub the carbon brush and cause loss. The carbon brush needs to be replaced on a regular basis. The carbon brush and the coil connection will alternately open and close, sparks will occur, electromagnetic breakdown will occur, and electronic equipment will be disturbed.
The engine is powered by the combustion of fuel in the cylinder to generate power, the input fuel volume is limited by the amount of air drawn into the cylinder, the power generated will be limited, if the engine's operating performance has been in the best condition, then increase The output power can only increase the amount of fuel by compressing more air into the cylinder, improving the combustion function. turbocharger shaft Under current technology conditions, the turbocharger is the only mechanical device that can increase the output power of the engine without changing the operating efficiency.
The turbocharger is a machine consisting of a turbine chamber and a supercharger. The inlet of the turbine chamber is connected with the exhaust manifold, and the exhaust port is connected with the exhaust pipe; the supercharger air inlet and the air filter pipeline Connected, the exhaust port is connected to the intake manifold. The turbine and the impeller are respectively installed in the turbine chamber and the supercharger, and they are coaxially rigidly coupled.
The turbocharger is actually an air compressor that increases the amount of intake air by compressing the air. It uses the inertial impulse of the exhaust gas emitted by the engine to propel the turbine in the turbine chamber. The turbine also drives the coaxial impeller. The impeller pressures the air sent from the air filter duct to pressurize it into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase at the same time, the impeller will compress more air into the cylinder, the air pressure and density increase can burn more fuel, increase the fuel amount and adjust the engine's Speed, you can increase the engine's output power.
The turbocharger is installed on the intake and exhaust manifolds of the engine. Under the working conditions of high temperature, high pressure and high-speed operation, the turbocharger has a very harsh working environment and a relatively strict working requirement. Therefore, the turbocharger is required for manufacturing materials and processing technology. Very high. Among them, the most difficult to manufacture is the “floating bearing” that supports the operation of the turbine shaft. Its working speed can reach 100,000 rpm or more, and the ambient temperature can reach six or seven or more Baidu, which is by no means a general bearing. There is oil cooling between the bearing and the inner wall of the machine body, also called "full-floating bearing".
The turbocharger consists of a turbine wheel and a compressor wheel mounted on the same supercharger shaft. The supercharger shaft is supported on a bearing in the supercharger housing. The turbine wheel and the compressor wheel have many blades. Exhaust from the cylinder directly enters the turbine and drives the impeller and booster shafts to rotate, because the compressor wheel is fixed at the other end of the booster shaft, so the compressor wheel also rotates with the shaft.
The impeller of the compressor is installed in the intake duct. When the compressor impeller rotates, air is sucked into the intake duct and sent to the intake duct after being compressed by the compressor. Most supercharged engines are air-duct fuel injection engines. Fuel injected into the intake passage is mixed with compressed air to form a denser air-fuel mixture. As the amount of air-fuel mixture entering the cylinder increases, the engine power increases.
Turbocharged impellers rotate at high speeds in excess of 100 000 r/min, so impeller balance and bearing lubrication are very important. The supercharger shaft must reach a certain speed before the supercharger starts to pressurize the air in the intake pipe. Some turbochargers start to compress air at an engine speed of 1 250 r/min, and at 2 250 r/min. The maximum boost pressure is reached.
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