PWM technology influences the characteristics of motor

Stator And Rotor ac induction motor parts 

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

3. Material: silicon steel
After the last illustrates the chopper battery and motor current is no longer the same physical process, the following mathematical expression is used to demonstrate the PWM influences the characteristics of motor. Motor PWM control theory is a familiar formula (power tube as an ideal switch device, it does not auto spare parts cause obvious errors), namely 3 phase induction motor the VD = rho VB (1), DVD - the average voltage of the motor VB - battery voltage. As long as the filter capacitance is large enough, the battery internal resistance is small enough, VB can be considered to be stable. Rho - control pulse duty ratio (0 ≦ rho ≦ 1). Chopper state rho for a decimal. (1) show that there are chopping, voltage of the rotor motor is reduced, this is the principle of speed regulation. Chopper is stable after, motor current waveform is cyclical approximate triangular wave, can be mathematically proved that the motor current average ID (if for the brushless motor, ID should be interpreted as the average of the conduction phase within the current). ID = IB/rho or IB = rho ID (2) that the average - IB battery current in motor current be amplified to the battery current IB 1 / rho times. With the current of battery, transform the big current of motor or motor torque, this is one of the important role of the controller, so, sometimes referred to as the converter controller. 


Y2 series high power China ac motor

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration 
At this time, acmotor2.blogspot.com the motor of the electric potential equation for VD R0 = ED + ID * (3) in R0 - motor diesel generator set coil resistance ED - the counter electromotive force. ED is proportional to motor speed locked-rotor when ED is 0, if the current limit of the controller is stable chopper technology, magnetic generator the above various remains valid. Type of motor can be obtained by (3) locked-rotor current IDmax, reuse (1) get IDmax = VD/R0 = rho t VB/R0 = rho tIB0max (4), IB0max = VB/R0 -- without stalling a motor current controller, also single phase induction motor called full pressure starting current rho t - design decision control pulse duty ratio. This shows that the maximum current of a motor is unlimited flow of rho t times, be reduced, which is exactly what we expect of current limit. Using (2) and (4), can be obtained after the battery generator current stable value (not the maximum reasons shall be described below), the motor current and full pressure maximum starting current relation between IBfinal = IDmax alternator generator rho t = 2 t IB0max rho (5) ac induction motor of these three values are measurable, the above relationship can also be verified. When rho = 1, the equivalent of the motor directly connected to the battery, so (4) into a VB R0 = EB0 + IB0 * (6) (3) and (6), respectively, described the motor is chopping and no chopping the potential equilibrium equation of state of the two. (6) of the motor current and back emf with index 0, with the state of the chopper motor current and back emf value is not the same.

Switch the application of two

generator Stator Rotor 

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

3. Accessories Series: stator and rotor 
 If the network utilization rate is over 40%, and the collision rate is greater than 10%, the switch can help you to solve any problem. With single phase motor 100 MBPS fast Ethernet and 10 MBPS Ethernet port switches can run full duplex mode, can set up a dedicated 20 MBPS to 200 MBPS connection. Not only the role of different switches under the network environment each are not identical, in the same under the network environment to add a new switch and increase the exchange of existing switch ports have different effects on network. Fully understand and grasp the network flow model is can rotor stator pump give play to the role of switch is a very important factor. 

CCC,CE Certification and Waterproof Protect Feature ac motor
Specifications
power range: 0.12-18.5 kW 
Centre height of frame: 63-160 mm 
Rated Voltage: 220V 

Rated Frequency: 50Hz or 60Hz 
For the purpose of the switch is as far as possible to reduce and filtering in the network data traffic, so if a switch in the network due to improper installation position setting, almost need to forward to receive all packets, switches will acmotortrading.blogspot.com not be able to play its role in optimizing the network performance, but reduces the data transmission speed, increased the network latency. In addition to installation location, if the load is small, low also blind add switches in the network information, also may have negative effects. The packet buffer size of processing time, switches and need to regenerate new packets, the influence of such factors as in this case is simple to use HUB to a more ideal than switches. Therefore, we can't think anything switches have an advantage than the HUB, especially when the user's network is not crowded, there are a lot of available space, use a HUB is more able to make full use of the existing resources of the network.

Sensorless brushless dc motor control - inductive method

  electric motor 20hp aluminum body 
Specifications
1. 20 years manufacturing experience
2. competitive price,high quality
3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

 Inductive method has two forms: one kind is used for salient pole permanent magnet brushless dc motor, another kind is used in the embedded magnetic steel structure of the permanent magnet brushless dc motor. The first inductive method mainly through applying detection in the process of starting the www.facebook.com/guohong.trading motor winding voltage to judge its inductance changes, it is used in "the potential laws" a starting technology. Because in a salient pole machine, winding, the self inductance L said into the axis of the winding and the rotor can be direct axis Angle between H times cosine function, by detecting the change electric motor fan cover of L, can determine the approximate location of the rotor axis, and then based on the change trend of iron core saturation degree determine its polarity, thus eventually get correct position signal. This method for implementation is difficult, and can only be applied to the salient pole machine, so the application is less now. 


Y series totally enclosed protect Asynchronous motor

Specifications
1. 20 years manufacturing experience 
2. 12 months guarantee 
3. low noise and temperature rise 
4. high starting torque 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

Compared with the first, the second form is the true sense of the inductive method. In an embedded type permanent magnet brushless dc motor, the winding inductance would occur because of the change of rotor position and corresponding change, by detecting the change, after a certain calculation again, can get the rotor position signal. When y connection of the three-phase winding inductance changes, including point potential V n will change. Assume in figure 3 a + T, T, b - conduction, when So, lamination detection of L b = L a moment, can detect the ec passing zero moment. This method put forward by foreign first, and on the air conditioning compressor control application, speed range might reach 500 ~ 7, 500 r/min. This method of detection precision, error is small, but the difficulty is bigger also, it needs to continuously the real-time detection of the winding inductance.