To promote efficient motor facing difficulties and solution:

Motor system in our country the total capacity of about 700 million kilowatts,but market is less than

3% efficient motor,motor drive system as a whole running efficiency is 20% lower than in developed

countries.Domestic production of highly efficient motor exported to abroad,long-term facing

"foreigner to eat meat,people drink soup".The cause of such an awkward situation mainly include: 1,the purchaser without the consciousness of energy conservation and environmental protection.220v ac electric motors Most of the current domestic buyers include companies and government agencies,not the consciousness of energy conservation and environmental protection,in the process of purchasing,will purchase cost as the main factors of choosing products.In addition,due to the separation of buyers and users of the motor is,don't understand the life cycle cost of motor and the importance of motor efficiency,it also caused the motor when the choose and buy focusing only on the initial cost,choose the cheap products.

2,more efficient motor due to the raw materials used,the cost about 20% higher than normal

motor.Efficient motor efficiency mainly depends on its use more materials,such as copper and

steel,and raw material prices are rising,caused the high efficient motor manufacturing costs,which creates a situation of the buyers tend to general motors.3,although our country also made the energy efficiency standards of ordinary three-phase asynchronous motor,the allowable value of the small magnet prices and medium-sized three-phase asynchronous motor efficiency and energy conservation value "(GB18613-2006),file regulation,below the level 3 energy efficiency of motor lock-up,and set a transition period of four years,after July 1,2011,ban to level 3 energy efficiency motors.Standards for nearly four years,the effect is not ideal.Country's implementation of the mandatory energy efficiency label,but also hope that the user can like to buy home appliance products,electrical products of choose and buy,according to the level of energy efficiency in order to impel the promotion of high efficiency and energy saving motor.In fact,the vast majority of terminal consumers generally can't see the logo of energy efficiency of the machine.At present,the energy efficiency label system in small and medium-sized motor enterprise promotion effect is very poor.

The deputy secretary-general of China energy conservation association Song Zhongkui hit the nail on the head to point out:"mandatory standard is not mandatory standard itself,but in the implementation of standards,should be clear which department is responsible for the

implementation of the provisions of the relevant also to refine and maneuverability,otherwise,the

mandatory is impossible".Experience from abroad,the implementation of the compulsory standards relating to both positive and negative aspects,one is the positive energy efficiency label system,2 it is to reverse the acmotor2.blogspot.com disciplinary system.For illegal behavior,energy efficiency label management center to China academy of standardization related businesses face fines of up to 100000 yuan,weaker penalties.At the same time,relevant departments of the enterprises to carry out energy efficiency label check mainly for motor,failing to strengthen inspections of motor products on the market.To continue production generator stator after 4 years of protection level 3 energy efficiency of the motor companies to adopt what kind of punishment measures,is still not clear.

In addition,recently,the national development and reform commission jointly issued by the

ministry of finance on the huimin engineering efficient motor energy saving products promotion notice of the detailed rules for the implementation,some enterprises put forward:in the notice requirements apply for promoting enterprise in domestic low-voltage three-phase asynchronous motor and the high voltage three-phase asynchronous motor promotion amount not less than 300000 kilowatts,or rare earth permanent magnet motor promotion amount not less than 10000 kilowatts.According to the condition,in the domestic promotion quantity is difficult to provide.In addition,there are enterprises to increase subsidies.Mentioned in the notice,within 30 days after the end of year,promote enterprise liquidation report on the annual subsidy funds are put forward,step by step to the Treasury.There are business people think that the cycle is too long,the enterprise capital is not drained in time."Visible,maneuverability of policies on promoting efficient motor remains to be improved.

good performance cheap high efficient ac induction motor

7.Why stepper motor torque will vary with the increase of rotational speed down? When stepping motor rotation,the motor of each phase winding inductance will form a reverse electromotive force;The higher the frequency,reverse electric The greater the potential.Under the function of it,the motor with frequency (or speed) and the phase current decreases,which leads to torque decline.8.Why can generator rotor and stator operate properly when stepping motor at low speed,but above a certain speed won't be able to start,accompanied by whistler? Step motor has a technical parameters: no-load start frequency,namely step by step Motor under no-load condition can normal boot pulse frequency,if the pulse frequency is higher than the value,the motor does not start properly,may be lost or blocked.In a load Under the condition,Start frequency should be lower.If you want to make the motor to achieve high-speed rotation,the pulse frequency should be to accelerate the process,the start frequency rate is low,and then in a certain high frequency acceleration to want (electricity Machine speed from low speed to high speed).9.How to overcome the two-phase hybrid stepping motor vibration and noise during low speed? 

Stepper motor rotates at low speed vibration and noise is its inherent shortcomings,can adopt the following solutions to commonly Overcome: a.if the stepper motor work on resonant zone,but by changing the reduction ratio and other mechanical transmission to avoid the resonance region;B.using with the function of subdivision drive,this is the most commonly used,The easiest way;C.to step away from the Angle brake rotor of smaller stepper motor,such as three-phase or five phase stepper motor;D.for ac servo motor,can almost completely overcome the vibration and noise,but become This is higher;E.add magnetic damper on the motor shaft,on the market for this product,but the mechanical structure change is bigger.10.The fine fraction of subdivision driver can represent accuracy? Stepping motor subdivision technology is essentially an electronic damping technology (please refer to the relevant literature),its main purpose is to reduce or eliminate the weak Eliminate the low-frequency vibration of the stepping motor,improve the operation precision of the machine is only a supplementary function of subdivision technology.

Such as in the step Angle is 1.8 ° two-phase hybrid stepping motor,if fine Points drives the fine fraction of set to 4,then the motor running resolution for each pulse 0.45 °,the precision of the machine can achieve or close to 0.45 °,still depends on the subdivision driver segmentation Other factors such as current control accuracy.Different manufacturers of subdivision drive accuracy

may vary widely;The more difficult it is to fine grade,the greater the precision control.11.With four

phase hybrid stepping motor drives the series connection and and what is the difference between the

connecting method? Generally consists of two phase four phase hybrid stepping motor driver to

drive,therefore,the connection can be used Series connection or parallel connection to connect two

phase using four phase motor.In series connection in place of motor speed electricalmotor1.blogspot.com is used commonly,the need to drive the output current for the motor phase current of 0.7 Times,thus motor heating small;And connection generally use in motor speed higher occasions (also called high speed connection),needed to drive the output current for the motor phase current of 1.4 times,and electricity Fever is relatively large.