Capacitor start motor

In capacitor start motor,start capacitance and start winding string together,thus forming a LC circuit,the circuit has good phase shift (and thus have a very good starting torque).The resistance for the motor will also increase the cost.Fixed phase capacitor motor Another motor is fixed phase capacitor (PSC) motor (i.e.,capacitor motor) up and running.This kind of motor operation mode is similar to the capacitor start motor described above,but it does not have the centrifugal switch,so

its secondary winding is connected to the grid.PSC motor is usually used in hair dryer,electric fans,blowers,and other need to change.Under the condition of invariable load by changing www.dongfeng-motor.com the running winding signal to achieve the purpose of make the motor run at different speeds.All six winding connection respectively,a three-phase motor can connect two winding together through the rest of the a winding capacitance connected to start winding to run into one capacitor start motor.The repulsion motor Repulsion motor is single-phase ac motor rotor winding,it is similar to ac/dc motor.In the repulsion motor armature with brush nipple rather than and in series with the magnetic field.

Already have a few kinds of repulsion motor into production use,but most of all,with repulsion start sensing (RS)-IR motor operation.RS-IR motor with a centrifugal switch all the short commutator connect together,so when it is up to full speed it will run in the form of induction induction motor sales motor.RS-IR was used in the motor under low temperature and low voltage per ampere provide large starting torque.In 2005,almost did not sell any type of repulsion motors.Single-phase ac synchronous motor Small single-phase motor can also be designed to be magnetized rotor.This does not require any motor in the rotor induction motor,so they will not be lower than the main frequency.Instead,they will be as the rotation frequency synchronization.Because of their high speed precision,this kind of motor is typically used in electric power mechanical clock,record machine and tape recorder; They are also used in such as ribbon machine and telescope driving mechanism requires precise time of equipment.Shaded pole type synchronous motor is one of them.Because of inertia,so it is difficult to the rotor from state stopped immediately accelerated to synchronous speed.This kind of motor usually need some special way to start.A variety generator rotor and stator of different Design with a small induction motor (it will share the same and the synchronous motor excitation coil and rotor) or one- way speed (guarantee the rotor startup positive speed) as the very light of the rotor.

Double speed three phase asynchronous motor winding classification

A single layer winding: Single-layer windings is each embedded in the stator slot only buy a coil winding, on the edge of effectively, so it only total coil motor half of the total number of slots. The advantages of the single layer winding is winding coil number less process is simple; Utilization of the interlayer not denied because trough increase; Single layer does not happen and breakdown failure, etc. Drawback is the winding of the electromagnetic wave shape is not ideal, motor iron loss and noise are large and starting performance also is a bit poor, so the single layer winding asynchronous motor only commonly used for small capacity. In accordance with the single layer winding coil shape and arranged termination local arrangement is different, can be divided into chain winding, cross chain, concentric windings and intersection concentric winding winding types, etc. www.facebook.com/dongfeng.motor 1 chain chain windings is by having the same shape and width of single coil components, due to its winding ends each coil like set up the link of the name. Should pay special attention to single chain winding of the coil pitch necessary for odd number, otherwise will not be able to arrange the winding arrangement. As per each phase 2 cross chain winding slot number nine is greater than 2 odd number will not be able to arrange the chain winding arrangement, at this time will need to use the intersection with single and double coil winding. Three concentric winding in the same group of extremely all coil around the same circle. When each phase slot number per level 4 Q is greater than 2 even can adopt the form of cross concentric winding. The advantages of ac synchronous motor single-layer concentric winding and cross concentric winding for winding, is relatively simple, embedding a long use wire end of faults is too much. Now except for useful in small capacity of 2, 4 pole motor, is now rarely use this winding form. 

Double cascading winding Single and double layer composite winding Star connection relationship with the Angle joint When the star of by change Angle: the original star connection wire diameter total cross-sectional area divided by 1.732 is equal to the Angle of the wire diameter total cross-sectional area. The Angle of by change star: when the original Angle joint line diameter when the total cross-sectional area multiplied by 1.732 is equal to the star connection wire diameter asynchronous motor of the total cross-sectional area. The difference of star connection with nature Angle joint When star connection line voltage equals 1.732 times the phase voltage, phase current is equal to the line current. Angle joint when the phase voltage is equal to the line voltage and line current is equal to the phase current of 1.732 times. With the power of the motor, when the star connection, wire diameter thick, less number of turns, the Angle joint, fine wire diameter, number of turns. When the Angle joint sectional area is 0.58 times of star connection. When the Angle joint line diameter when the total cross-sectional area divided by 0.58 is equal to the star connection wire diameter of the total cross-sectional area. When the star connection wire diameter total cross-sectional area multiplied by 0.58 is equal to the Angle of the wire diameter when total cross-sectional area) cross-section of wire diameter calculation formula: cross-sectional area S = square multiplied by 0.785 is the diameter of the motor internal connection with salient pole and ordinary pole, salient pole and ordinary pole is determined by the design properties of the motor can not be changed motor no-load current coefficient calculation

New technology of double speed motor

Because of the pump station drainage standard is low, and the drainage area and large variation range of water level, so often occurs in the pump station has been built for super lift was forced to stop. For this kind of pumping station renovation, such as simply to replace the existing high lift water pump water pump, although is can solve the problem of pumping station super head, but is likely to accompany a pump under low head gravely deviates from the high efficient www.facebook.com/dongfeng.motor area, causing new problems such as cavitation and vibration. Two-speed motor is new technology on the basis of the original water pump, by changing the line will be converted into motor with high and low two two-speed motor speed. Allows the unit to the there was a high lift pump station, corresponding to run at high speed, low in pump motor part station head, corresponding to the low speed running, which can run in the pump station super lift requirements under the premise of guarantee the magnet generator pump running in high efficient area for a long time. At present, the double-speed motor has got application in dongshen water supply project, at the same time by wuhan university of hydraulic and electric engineering of pump and pump station laboratory under the support of the department of the ministry of water resources, also have finished the old motor into two-speed motor research topic (the technology has been declared national patent), and using the new technology of double speed motor pump station created good conditions. Old motor modification two-speed motor method is to remove the old motor winding, and according to the original polar logarithmic nested new winding. When nested new winding, a new tap, derivation of new winding coil through the tap can be back together, so that the motor of the logarithm change, so that the motor has two logarithm, namely has the function of double speed.