Electrical engineer for the selection of step motor

 

Stepper motor can transform electrical pulse signal into angular displacement or linear displacement.In the range of the rated power of the motor speed depends only on the pulse signal frequency and pulse number of control,and not affected by load change,coupled with step motor characteristics of cumulative error is small,in areas such as speed,position with stepper motor to control becomes simpler.Stepper motor three kinds,mainly is the hybrid stepping motor is widely used.When choosing a stepper motor,must pay attention to the following parameters as the manufacturer (are supplied with the motor):Step 1) from the Angle of: after receiving a step pulse motor rotation Angle.The actual interval Angle and fine fractions of the drive.Generally the precision of the stepper motor to step away from the Angle of 3-5%,not cumulative.2) number: the inside of the motor coil set number.Step phase number is different,is apart from the different Angle.If using subdivision driver,'phase number does not make sense: change the fine fraction can change electric motor cooling fan interval Angle.3) keep the torque: also called the largest static torque.

Refers to the rated power flow speed is zero,the external force force needed for the rotor rotational torque.Keep the torque has nothing to do with the drive voltage and drive power supply,etc.Stepper motor at low speed torque close to holding torque.As a result of the stepper motor output torque and power increases with the speed and constantly changing,so keep the torque is measured step motor is one of the most important parameters.Although holding torque is proportional to the electromagnetic excitation ampere turn,with the air gap between the rotor teeth.But too much by reducing the air gap,increasing the excitation ampere turns to improve static moment is not desirable,it will cause heating of the motor and the mechanical noise.Keep the torque type determined as follows: Stepper motor dynamic torque a while it is difficult to determine,tend to make sure the static torque of motor.Static moment of choice was based on motor work load,the load can be divided into two kinds of inertia load and friction load.Single inertial load,and there is no single friction load.Order more (generally by low speed) when (suddenly) starting when the two kinds of load are to consider,when accelerating (slopes) starting main consideration of inertia load,constant speed run into as long as considering the friction load.In general,keep the friction load torque should be within diesel generating set 2 to 3 times as well,holding torque once selected,motor frame and length can be set down.

The purpose of the motor

Motor USES many to heavy industry,and a small toy,in its tracks.In different circumstances can choose different types of wholesalemotor.blogspot.com motor,the following are some examples: The wind device,such as electric fans Electric toy car,boat,etc Elevator,the elevator With electric powered vehicles,such as underground railway,trams Automobiles,jet and helicopter starting motor (starter motor) Factory with big lots of conveyor belt The electric automatic doors on the rotor balancing machine bus Electric roller shutter Consumer goods drive The printer The washing machine The water pump Disk drive Electric shaver The tape recorder Video camera CD players Industrial and commercial purposes Express elevator Machine tools (such as: machine tool) loom 8500w gasoline generator A blender.

Motor model parameters

Motor model is easy to use,design,manufacturing and other departments for business contact and

simplified technology files in the product name,specification,type of narration and referenced by a symbol.Product code is made up of motor type codes,codes of characteristics and design of the serial number of three section sequence.Motor type code with:Y-said asynchronous motor;T-synchronous

motor;Motor 220v electric motor characteristic code represent the performance of the motor,the structure or purpose and use of the Chinese phonetic alphabet. Such as explosion-proof type letters EXE (type) of increasing safety,EXB (flameproof),EXP (positive pressure type),etc.Design the serial number is high in center,core diameter,frame number,the flange 12v motor length,length of frame,core code,power,speed,or series of said.

Such as:Y2-160 M1-8 diesel generatorY:models,asynchronous motor;2:design the serial number,"2" for the first time based on the improved design of the product;160:high center,is the shaft center to the base plane height;M1:frame length specifications,M is medium,including footnotes "2" is the second M type core specification,type and "2" longer than "1" type iron core.8:pole,"8" refers to eight pole motor.Such as:Y 630-10/1180 Y said asynchronous motor;630 said power 630 kw;10,stator core diameter 1180 mm;The length of the frame adopt the internationally used symbol of letter;S is short frame type,M is the base type,type L is the length.Core length of letter with www.dongfeng-motor.com Numbers 1,2,3,in turn,said.

Town drainage pumping station inspection rules before starting the motor?

(1) of permanent magnet generator 5kw insulation resistance shall conform to the requirements of the safe operation of the motor winding;(2) open inside the motor should be without sundry;(3) the wound rotor motor slip ring gasoline generator spare parts and brush should contact is low speed permanent magnet generator good, the pressure of the brush should be normal;(4) electric tractor for tapping should be tightened;(5) bearing lubricating oil (grease) should satisfy the lubrication requirement;(6) must be reliable grounding device;(7) motor dehumidifying device power supply should be disconnected.

Motor selection guide

Mechanical motor selection directly affects the operation efficiency and service life of the machine, so choose a reliable motor manufacturer product is crucial to its roughly may refer to the following aspects: Voltage and frequency; Domestic voltage grade of 6 kv + - 5%, the power supply voltage within ac induction motor the scope of this change does not affect the performance of the motor parameters. Level of domestic frequency 50 hz + - 2%, power frequency within the scope of this change does not affect the performance of the motor parameters. Motor installation location, high altitude and working environment temperature; < > rotary motor norm and performance stipulated in GB/T755 able motor installation location is not higher than 1000 m above sea level, is not higher than 40 degrees Celsius temperature environment. If the installation environment does not exceed more than the environment can be carried out in accordance with the standard data operation, if more than the above range of the motor output, generally less than the power of the sample, contact the ac motor electric 65kw manufacturer. Choose according to environment protection grade; Cement plants, flour mills, mining and other dust field should be more choose IP55 / IP54 products; Environment better no dust occasions to select IP23 / IP44 products. And if there is a protective measures should be considered when outdoor use and prevent the combining practical considerations such as canopy product protection grade. The load of the motor types; Usually a fan, water pump, compressor, machine load appropriate chooses squirrel-cage motor, ball mill, crusher, mill type appropriate chooses type motor. If you need speed regulating motor according to the speed control mode or speed, such as feedback motor, frequency conversion motor, etc. Often use squirrel-cage motor load is light, general selection around the linear motor in the load. Motor auxiliary equipment. Can consider cold wind power, space heater, temperature measuring element (our configuration for high voltage motor temperature measuring element, please information sima in shaanxi province jindu motor www.dongfeng-motor.com co., LTD.), current transformer, thin oil station (our stand number more than 500 and 710 stand above the 2 pole motor motor basically equipped with pressure circulating oil lubrication sliding axis), vibration components, etc