Ammeter pointer during no-load or load running back and forth

1),2) squirrel cage rotor broken bar,a phase winding rotor circuit (3),a phase of wound rotor type motor brush contact bad 4),wound rotor type motor Poor contact slip ring wholesalemotor.blogspot.com short circuit devices 9.The cause of motor vibration 1),2) unbalanced rotor,shaft bending head 3) 4),imbalance of pulley,pulley eccentric shaft hole 5),fixed the loose bolts 6) of the motor,fixed The acmotortrading.blogspot.com foundation of the motor not firm or uneven 10.The cause of the motor bearing perkins diesel generator set overheating 1),2) bearing damage,lubricating oil too much,too little,or oily bad with 3),bearing and perkins diesel generator set shaft too loose walk in circle or too close with 4),bearing and end cover too loose walk outside Or too close.5),sliding bearing ring rolling or slow rotation 6),on both sides of motor end cover or bearing cover is not flat 7),belt tight 8),coupling packed Not good.

General stepping motor

General stepping motor has eight root lead.It can be configured for single polarity can be configured to bipolar stepper motor.In resolution of this kind of stepper motor windings may cause some confusion,users because of wholesalemotor.blogspot.com the need to master the correct winding polarity and order.Usually,just rely on observation is unable to determine the polarity of the winding.Fortunately,you can through the electronic measurement method to infer it.1.Distinguish general stepping motor winding polarity In order to measure and determine the general stepping motor winding polarity,need a power supply or battery,and a digital multimeter.Please follow the following steps: (1) first of all,using a digital multimeter ohm file to find four leads,and to identify four windings.(2) choose two windings,and generator stator each choose a lead short answer to each other.Will switch to the digital multimeter AC voltage 20 v,connect the two pens and a digital multimeter to measuring the two ends of the winding.

3.Turn the motor shaft,if the get 2 v voltage reading,then found the same set of winding and also determine their polarity f figure of 81.If the multimeter reading is 0 v,as well as determine the polarity of the winding,the reverse polarity f they see electric motors price figure 9).Switch to the winding of the other fuses and short received another winding,in order to verify the previous assumptions.(4) with lead to indicate the polarity of the windings.As to which side as the above graphic mark of black spots in the end it doesn't matter,as long as you know how to group.2.The configuration method of general stepping motor polarity This section about configuration of general stepping motor polarity of three ways: single polarity,bipolar series and bipolar parallel.As shown in figure 10 configuration simulates a single polarity of single phase asynchronous motor the six winding stepper motor.Shown in figure 11 bipolar configuration can work at a relatively low frequency high torque.Its working frequency cannot is higher,because the series winding with high magnetic resistance,peak current,therefore,cannot fast.Dual polarity is shown in figure 12 parallel configuration the output torque is less than bipolar stepper motor cascade configuration,but it has higher operating frequency,because of the parallel winding configuration has a low magnetic resistance,peak current can be quickly.

The principle of three phase asynchronous motor

Creates a to synchronous speed n1 along the circle space inside the stator and rotor rotate clockwise rotating magnetic field.Due to the rotating magnetic field in the n1 speed rotation,the rotor conductor is still at the beginning of the rotor conductor will cut the stator rotating magnetic field and produce inductive electromotive force (judge the direction of the induced electromotive force with the right-hand rule) due to the rotor conductors sub is short circuit loop at each end,and  the effect of induction electromotive force,the rotor conductors will occur basic consistent with the direction of induction electromotive force induced current.Rotor current carrying conductor in the role of the stator magnetic field by electromagnetic force (force in the direction of the left small electric motors hand rule determine) electromagnetic force on electromagnetic

torque,rotor shaft drive Motor vehicle rotor spinning in the direction of the rotating magnetic field.By analyzing the working principle of the motor can be summarized as follows:

when the three-phase stator winding of the motor (the difference between a 120-degree Angle) to the balanced three-phase alternating current (ac),will happen in a rotating magnetic field,the rotating magnetic field cutting rotor winding,which occur in the rotor winding induced current (rotor winding is closed-cycle) rotor of current-carrying conductor in the stator rotating magnetic field under the action of electromagnetic force will occur,as to form the electromagnetic torque on the motor

shaft,motor rotation,and the motor rotation direction is the same as the rotating magnetic field

direction.

The winding of the motor faults

Winding is part and parcel of the motors, aging, be affected with damp be affected with damp, heat, erosion, foreign bodies, intrusion, the impact of the external force can cause damage to winding, motor overload, under voltage, over voltage, lack of phase operation can also cause winding fault. Winding grounding, short circuit, open circuit fault generally fall into winding, connection errors. 1, failure phenomenon Chassis charged, heat control circuit is out of control, winding short circuit, the normal operation of the motor. 2, the reason Make insulation resistance winding be affected with damp be affected with damp down? Motor overload for a long time to run? Corrosion of harmful gas? Metal foreign body into winding internal damage the insulation? Rewind stator winding Motor vehicle insulation damage when touch the core? Winding end touch end cover stand? , rotor friction caused insulation burn? Lead wire insulation damage into the shell? Overvoltage (such as lightning) insulation breakdown. 3, processing method, (1) winding drying should be affected with damp be affected with damp cause ground, when cooled to about 60-70 ℃, pour insulating paint again after drying. (2) the end winding insulation damage, in receiving is located in the back of the insulation and painting, dry again. (3) windings to place in the groove, diesel generating set should rewind or replace part windings components.