Motor current and battery current

 AC motor aluminum 2800 rpm motor fan cover 
Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 
4. AC motor 
Using PWM technology speed of brush the power circuit of the controller. Would like to point out, brushless controller in a pair of upper and lower power tube conduction during the work, 3 phase induction motor also can get a form as a power circuit. So, the following discussion is based on figure 1, but the conclusion is also applicable to brushless diesel engine controller. According to different grid input signal, the power tube T there are three kinds of working state: 1. Fully closed. The Water pump motor does not turn, the battery current value is very small, weak current supply controller circuit. If ignore the weak current circuit power (for convenience, this hypothesis through the full text), motor and battery current and can be thought of as zero. 2. Complete conduction. The battery current flows through the motor, again through the power tube into the ground. Battery current and the motor current and power tube current are equal, all are smooth continuous dc current. Generally, transfer electric vehicle speed moving when the voltage spin to maximum, is this kind of situation. Ignore the power tube conduction pressure drop 3 phase induction motor equal to the motor directly to the battery. Electric characteristics is completely determined by the characteristics of the motor at this moment, has nothing to do with the controller. 3. The switch (chopped). Cycle the power tube grid input is the same, duty ratio control of variable pulse, three single phase motor phase induction motor so the squirrel cage induction motor power tube will continue in the open and disconnect between two states. 


Cast iron ac induction electric fan motor parts 

Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Type: iron body of AC electric motor 
Opening period, regardless of the opening of the transient current, battery current and the motor current and the instantaneous www.dongfeng-motor.com value of power tube current is equal; After disconnection, power tube current and battery current is zero. So, the battery current is pulsed current. And motor current situation is: power tube broken moment, according to Faraday's law of electromagnetic induction, the motor coil will produce self-induced electromotive force, its direction is by power tube end is positive, a negative side on batteries. As a result of the existence of stream tube D, to form a closed loop, the induced current. This process is a process of the original release of stored energy in the coil, the induced current will decrease over time until the next opening time of power tube. In other words, shut off during the current is induced current in the motor, it flows through the ac synchronous generator stream tube D, energy consumption in the motor coil resistance and flow pipe. Usually motor electromagnetic time constant is usually greater than the control pulse cycle, so shut off during the motor current will not reduce to zero. To sum up, said the battery are always equal, and the power tube current and battery and motor current in power tube only completely conduction is equal, in the state of chopper is not equal. During the chopper, battery is pulsed current, and the motor current is continuous, the former average average is less than the latter, and its size and the control of the conduction of pulse related to system parameters. The next section will give the relation between them.