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three phase electrical motor”的博文。
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显示标签为“
three phase electrical motor”的博文。
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Cast Iron electrical motor auto spare parts
Specifications
1. 20 years manufacturing experience
2. competitive price,high quality
3. Delivery Detail:within 10 days after receiving deposit
Micro current transformer is similar to the transformer is also according single phase motor to the principle of electromagnetic induction to work, is the voltage and the micro current transformer of transformer transformation transform is current. As shown in figure measured current winding N1, called the primary winding (or the original winding, primary winding); Winding N2 measuring instrument, electric motor price known as the secondary winding (or) vice winding and secondary windings. Micro current transformer primary winding current I1 and I2 secondary winding current ratio, than the actual current K. Micro current transformer in the motor electric rated electric current work shed than called current transformer rated current ratio, expressed in Kn. Micro current transformer can be roughly divided into two classes, measuring current transformer and protection current transformer.
Rated current I = P30KW U0.38 KV / 1.732 * * 0.2 = 227.9081 A, but electric motor 12v 500w 30 kw motor power factor can't be so low ah, do you want to calculate no-load running current of motor. The question you ask is problematic. ac three phase motor 30 kw motor power factor should be above 0.75. If according to the capacity of current rating: I = P30KW U0.38 KV / 1.732 * * 0.75 = 60.7755 A. Teach you two formula, very useful: "capacity divided by the number of kv, dealer by coefficient of seventh. "A kw, two current" can estimate the rated current of three-phase motor. Low power factor, then the acmotor2.blogspot.com motor should be banned the example of the net. Line current of three-phase ac asynchronous motor I material 2 P, P - power, kw. I material 2 x 60 kw motor current 30 = 60 a.
Sampling resistance and HCPL - 7840 connections, sampling resistor R1 is end connected to the Vin +, the negative terminals of fan cover the sampling resistor connected to the Vin? The real-time motor current is converted into analog voltage input chips; At the same time Vin? GND1 connection, and the return path of power supply and the sampling line connected to the negative terminals of the sampling resistance, because www.dongfeng-motor.com it is a lot of current when motor at work through the sampling circuit, parasitic inductance in the circuit can produce a large current spike, but this kind of connection can take these transient noise as a common mode signal, not for the sampling current signal interference; In addition, to eliminate the high frequency noise, sampling current input signal sampling resistor small diesel generator on the voltage signal have been collected by the R2 and C3 of low-pass filter into the chip.
