Induction motor drive system

Asynchronous motor is characterized by simple structure,strong and durable,low cost,reliable operation,low torque ripple,low noise,do not need to position sensor,high speed limit.Induction motor vector control speed regulation technology is mature,the asynchronous motor drive system has obvious advantages,so the earlier was applied in electric vehicle drive system,the current is still the mainstream of the electric vehicle drive system products,but have been other new type of brushless permanent magnet traction motor driving system is gradually replaced.Biggest disadvantage is that driver circuit is complex,high cost; Relatively permanent magnet motor,induction motor efficiency and power density is low.2.The brushless permanent magnet synchronous motor drive system three phase induction motor Brushless permanent

magnet synchronous motor can use cylindrical radial magnetic field structure or disc axial magnetic

field structure,due to the power density and high efficiency and magnet prices wide speed

range,development prospect is very broad,is a strong competitor in the traction motor of electric

vehicle,had been used in a variety of electric vehicles at home and abroad.

Built-in permanent magnet synchronous motor,also known as hybrid permanent magnet reluctance motor.The motor on the www.dongfeng-motor.com basis of the permanent magnet torque superposition of the magnetic resistance torque,the existence of the magnetic resistance torque to improve motor overload capacity and power density,and easy to weak magnetic speed regulating,expanding the scope of the constant power operation.Built-in permanent magnet synchronous motor drive system design theory is increasingly perfect and further,with flexible structure,design degrees of freedom,is expected to get high performance,suitable for electric

cars,high efficiency,high density and wide speed traction drive.These cause the attention of the

peers in the major car companies,especially the Japanese car company colleague's favor.

At present,the American car companies peers in new model design mainly USES the built-in permanent magnet synchronous motor.generator stator Surface; also called permanent

magnet torque motor type permanent magnet synchronous motor,against the built-in permanent magnet synchronous motor,its weak magnetic speed range is small,low power density.The structure of the motor dynamic response is fast,and is expected to get low torque ripple,suitable for used in automobile electronic servo drive,such as automotive electronic power steering servo motor.Sensorless permanent magnet synchronous motor drive system is currently a hot topic in the research of permanent magnet synchronous motor drive system,will become the development trend of the permanent magnet synchronous motor drive system is one of the potential competitive advantage.Permanent magnet synchronous motor drive system often adopts vector control at low speed,high speed with weak magnetic control.

Before starting the phase asynchronous motor preparation and checking

1,check the brake motor and boot device grounding is reliable and complete,wiring is correct and in good condition.2,check the motor nameplate is shown in the voltage,frequency and power supply voltage and frequency.3,the newly installed or discontinued for a long time before starting the motor windings should check relative phase,the relatively insulation resistance.Insulation in the group should be greater than 0.5 ohms,if lower than this value,should be the winding drying.electric vehicle motor 4,should check the collector ring on the wound rotor on the brush device can work normally,brush pressure is in line with the requirements.5,check whether the motor rotation is flexible,whether within the sliding bearing oil reaches the oil level.6,check whether the rated current of fuse used motor meets the requirements.7,check the motor and installation bolt fastening bolt are on tight.After the above checks all meet the requirements,can start the motor.Motor starts,no-load running for 30 minutes,observe whether there are abnormal phenomena,such as noise,vibration,fever found abnormal situation,should take measures to stay is eliminated,can be put into operation.

When start the wound motor,should will start the rheostat connected to the rotor circuits.For motor with brush lifting mechanism,should put down the brush,and disconnect short circuit device,close the stator circuit switch,pull (rheostat.When the motor is close to the rated speed,brush,close the short circuit device,motor start over.The wholesalemotor.blogspot.com running maintenance 1,motor running after the regular maintenance,minor repair,overhaul two general points.Minor repair is a general maintenance,not big to the motor start device and a whole disassembly,about one in the first quarter,overhaul to all parts of all transmission device and motor is removed,and will remove the components of a comprehensive inspection and cleaning,usually once a year.2,use instrument monitoring power supply voltage,frequency and the load current of the motor.Power supply voltage,frequency,to comply with the motor nameplate data,motor load current shall not exceed the specified value,the plate of or to find out the reason,take measures to motor fan bad situation to eliminate the rear

can continue to run.3,take the necessary means to each part of the test motor temperature rise.4,for

wound rotor type motor,often should pay attention to the contact pressure between the collector ring

and brush,wear and spark.When motor stalling,should disconnect the switch inside the stator

circuit,then brush lifting mechanism to start position,disconnect short circuit device.5,motor should be always kept clean,there is no debris into the motor internal; Air inlet and outlet must be kept free of traffic.