Capacitance recognition

1,the capacitance in circuit "C" and is commonly used in digital representation (such as a capacitor C13 said Numbers for 13). Capacitor is made up of two pieces of metal film,close to the middle separated by electric motors 12 volt insulating material and components. The characteristics of capacitance communication mainly blocking circulation. The size of the capacitance is said to store electrical energy,the size of the capacitance effect is called the capacitive reactance of ac signal,it is associated with the frequency of the ac signal and capacitance.Capacitive reactance XC = 1/2 PI c f (f is the frequency of the ac signal,capacitance c said) is commonly used in telephone with electrolytic capacitor,the kinds of ceramics capacitors,SMD capacitors,monolithic capacitors,tantalum capacitors,polyester capacitors,etc. brake rotor 2,capacitance recognition methods: identification method of capacitance and resistance identification method of basic same,straight standard method,three kinds of color standard method and standard method. 

The basic unit of capacitance with ferrari (F),according to other units include: milli single phase electric motor method (mF),micro method (uF),sodium (nF),leather (pF).Among them: 1 q = 10 3 mm = 10 6 micro method = 9,10 = 10 12 leather method of large capacity capacitor on capacitance directly to mark its capacity values,such as 10 uF / 16 v capacity small capacitance of its capacity value with letters or Numbers on the capacitance letter notation: 1 m = 1000 uF p2 = 1.2 PF 1: n = 1000 PF digital wholesalemotor.blogspot.com representation commonly used three figures show that the size,two significant figures,said before the third digit ratio. Such as: 102 said 10 x 102 = 1000 pf pf said 22 224 x 224 = 0.22 uF pf 3,the capacitance error table F G J K L M allowed error of plus or minus 1% plus or minus 2% plus or minus 5% plus or minus 10% plus or minus 15% plus or minus 20%,such as: a ceramics capacitors for 104 J said capacity of 0. 1 uF,the error of plus or minus 5%.

Ac servo motor control

The structure of the dc servo motor as the common dc motor, and is done in order to reduce the moment of inertia of long and thin. It's exciting winding and armature respectively by two independent power supply. There is also a permanent magnet, namely the pole is a permanent magnet. Usually adopt the armature control, that is, f certain excitation voltage, establish flux Φ is also a constant value, and the control voltage in the armature Uc, institutional characteristics of the dc servo motor (n = f (T)) and dc separately excited motor, three-phase asynchronous motor under different control voltage (Uc control voltage rating) of mechanical characteristic curve. By the graph is: under certain load torque, when magnetic flux unchanged, if the rise in the armature voltage, the electric vehicle motor speed of the motor is higher; On the other hand, the lower the armature voltage, speed dropped; When Uc = 0, motor immediately halt. To motor reversal, can change the armature voltage polarity. Compared with dc servo motors and ac servo motor, it has mechanical properties is stiff, the output power is larger, rotation, large starting torque, etc The normal operation of the servo motor, as long as out of control voltage, the motor stop immediately. When servo motor loss control voltage, it is in single phase operation state, due to the rotor resistance is big, the rotation of the two opposite directions in the stator rotating magnetic field and rotor effect produced by the two torque characteristics (T1, T2 S1 S2 curve) and synthetic torque characteristics (t-s curve, with the ordinary single-phase asynchronous motor torque characteristics (T '-s curve). Then the synthesis of torque T is the brake torque, so as to make the motor stop quickly. Servo motor is single-phase runtime mechanical characteristic curve. 

A certain load, the control voltage Uc, the higher the speed is higher, in the control voltage, load, speed down. The structure of the ac servo motor stator is basically similar to capacitance split-phase single-phase asynchronous motor. On the stator winding with two position difference of 90 ° to each other, one is Rf excitation winding, it always pick on the ac voltage Uf; L, another is the control winding connection control signal voltage Uc. So is also called the two ac servo motor servo motor. wholesalemotor.blogspot.com Hollow cup rotor servo motor structure without control voltage ac servo motor, the stator is only produced by the pulse excitation winding magnetic field, rotor motionless. When a control voltage, stator and then produce a rotating magnetic field, the rotor rotate along the direction of the rotating magnetic field, in the case of constant load, the speed of the motor changes with the size of the control voltage, when the control voltage of opposite phase, servo motor will be reversed. The output power of the ac servo motor is 0.1 100 w. When the power supply frequency 50 hz, voltage is 36 v, 110 v, 220, 110 v; When the power supply frequency is 400 hz, the voltage have 20 v, 26 v, 36 v, 115 v, etc. Ac servo motor smooth operation, low noise. But control characteristic is nonlinear, and the rotor resistance is big, loss is big, efficiency is low, so compared with capacity of Y series motor, big volume, heavy weight, so is only applicable to 0.5 100 w small power control system. The working principle of ac motor fan servo motor with split-phase single-phase asynchronous motor, though similar, but the rotor resistance of the former is much larger than the latter, so compared with the single asynchronous motor, servo motor has three significant characteristics, due to the rotor resistance is big, the torque characteristic curve 1, with normal asynchronous motor torque characteristic curve, compared to 2 a significant difference between the two. It can make the critical slip S0 > 1, this not only makes the torque characteristic closer to linear mechanical properties, and has a large starting torque. Therefore, when the stator's a control voltage, rotor rotating immediately, which has the characteristics of starting fast, high sensitivity. The rate in the range of 0 to 1 S servo motor can stable operation.

The application of soft start the motor?

Widely used in coking production process equipment such as fan, water pump, and belt conveyor, generally need to directly under overloading starting motor, starting current is as high as 8 =; Times, power electric fan motor parts supply network voltage drop is too large, to be the impact of the driven equipment and control equipment failure rate is high. To solve the problem of high power motor start-up, generally USES the frequency-sensitive rheostat, since the lotus root transformer, B C % perkins diesel generator conversion and yanbian triangle startup mode, etc. But the traditional way of step-down start widespread starting equipment complex, small starting current and starting torque, etc. And the operation of the protection in motor, there are imperfect or insensitive. In recent years, with the development of power electronics technology and its related devices, three-phase asynchronous motor soft start technology has become increasingly perfect, and has been widely used. Soft starter is composed of microprocessor and high power thyristor, with microprocessor control thyristor conduction Angle, to control the output voltage. Therefore, the soft starter is actually can automatically control the step-down starter. Because you can adjust the output voltage and current closed-loop control, so be better than the series resistance and autotransformer such as traditional step-down starting way. 

And the failure rate is higher, the startup current impact on motor is extremely adverse. 3, soft starter start Soft starter starts, not only the operation is simple, and can be obtained from the motor initial starting torque, starting voltage can be increased. Selects the kick start function, can provide big promotion for motor torque, in order to overcome the inertia of load and quickly complete the boot process, the actual starting time of 261. By drum machine cold section in the practical application showed that the circulating water pump motor soft start technology not only can provide flexible start mode and excellent start features, can also provide soft start, soft start of belt optional kick start, current-limiting starting, double ramp up and started full pressure, etc. In addition, can provide various operations of protection, fault conditions directly read operation parameters www.dongfeng-motor.com of the motor, fault self-diagnosis function, with stepless regulating switch to eliminate the system of contact. Humanized menu interface can easily access or modify the parameters, to achieve centralized control through additional communication network interface. Also can effectively reduce the startup of mechanical stress, reduce the impact to mechanical transmission components.

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