ABB Original High Efficient Low Voltage AC Motor

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Brand Name:ABBModel Number:HXR 560 SeriesType:Squirrel Cage Motor
Frequency:62.2 HzOutput Power:750 KWProtect Feature:Explosion-proof
Phase:Three-phaseCertification:CEAC Voltage:690V
Place of Origin:Shanghai China (Mainland)Efficiency:IE 1Packaging Detail::EXPORT STANDAR WOODEN CASE
StructureAsynchronous MotorFunctionDriving UsageUniversal

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Q:Why AC motor speed control system will replace DC motor speed regulation system?
Among them, space vector PWM technology has been used more and more in AC speed regulation system because of its high voltage utilization, simple control algorithm and low current harmonic
Q:The actual power consumed by a three-phase AC motor is equal to line voltage * line current. How do you explain that?
The calculation formula of three-phase symmetrical load; power line I U 3 P= V COS line with =3I2R.Line voltage refers to the parallel voltage between the two phase lines (A-B, A-C, B-C), and the phase voltage refers to the parallel voltage of the relative zero (A-0, B-0, C-0).In the three-phase four wire distribution system neutral directly grounding; line voltage is equal to the phase voltage of 3 V, the phase voltage is equal to 3 V / line voltage, line current is equal to phase.
Q:The difference between three-phase AC synchronous motor and three-phase AC asynchronous motor
Synchronous machines are mostly used in large generators, while induction motors are almost exclusively used in motorsSynchronous motor can be flexibly adjusted by excitation power factor; power factor of asynchronous motor is not adjustable, so in some large factories, induction motor is applied more, can add a synchronous motor with adjustable camera, used to regulate power factor and power factory interface. However, due to the synchronous motor with high cost and maintenance workload now, generally by the capacitance compensation of the power factor.Because synchronous machine excitation winding and slip rings, the operator needs to have a higher level of excitation control, in addition, maintenance free and asynchronous machine, maintenance workload is bigger; so, as a motor, now mostly choose the asynchronous motor.
Q:How can a DC motor be changed into a three-phase AC motor with good performance?
Selection of asynchronous motor, power 60kW, voltage 400V, speed of only 960 RPM selectable (6 pole), if the speed is not enough to add speed (AC motor only 1500, 1000 (960), 750, 500 and several speed; if optional) must be 1000, as long as the election with step motor, just the price is too expensive.If the power supply capacity is not enough, without speed regulation, you need to calculate the starting capacity, select the starting mode and motor.The starting modes of squirrel cage asynchronous motor include direct start and star triangle startingThe above is cheaperThe starting modes of winding asynchronous motors are resistance start and frequency sensitive variable resistance starting
Q:What are the speed regulating methods of AC motors? Detailed point
(1) rotor circuit series resistance: used in AC winding asynchronous motors. The range of speed regulation is small, the resistance consumes power, and the motor efficiency is low. Used of cranes.(2) change the speed of power supply voltage, the speed range is small, the torque decreases greatly with the voltage drop, and the three-phase motor is usually not used. Used for single-phase motor speed regulation, such as fan.(3) cascade speed regulation, in essence, is the introduction of additional rotor electromotive force, change its size to speed. It is also only used in wound motors, but the efficiency is improved.(4) electromagnetic speed regulation. Used only for slip motors. By changing the exciting coil current, stepless smooth speed regulation, the mechanism is simple, but the control power is smaller. Not suitable for long term low speed operation.
Q:The difference between synchronous motor and asynchronous motor
Synchronous motor (synchronous motor) is an alternating current motor that generates torque by synchronous excitation of the exciting magnetic field and the rotating magnetic field of the armature.An alternating current motor with the same rotor speed as the rotating magnetic field of the stator. The rotor speed n and the magnetic pole logarithm P, the power frequency f meet n=60f/p. The speed n is decided by the power frequency f, so when the power frequency is constant, the speed is constant and has nothing to do with the load. The utility model has the advantages of high running stability and high overload capacity. Often used in multi machine synchronous transmission system, precision speed regulation, speed stabilization system and large equipment (such as rolling mills) and so on.
Q:DC motor speed control performance is very good, why do we need AC motor?
Because the DC motor needs a set of high-power DC power supply, the AC motor doesn't need it.
Q:What are the advantages of a DC motor and an AC motor?
An AC motor is a machine used to convert mechanical energy and alternating current energy. AC motor has become the most common motor because of the great development of AC power system. Compared with the direct current motor, the AC motor has no commutator, so the structure is simple, the manufacture is convenient, the utility model is firm, and the motor with high rotating speed, high voltage, large current and large capacity is easy to be made. AC motors have a large range of power. AC motors are usually divided into AC generators, AC motors and synchronous regulators according to their functions. The precision spindle n AC reversible Henglin motor working state, the same motor can be used as a generator and motor. It is not very precise to divide the motor into generator and motor, but some motors are mainly used as generator, some motors are mainly motor operated.
Q:Can the welding line of AC welding machine be dead?
In fact, if we discuss the electric shock of the two wire from the wider range, the harm to the human body is varied. The human body in the welding process in contact with the two line, the current acting on the human body in the contact area will produce electricity burns, electric brand or the central nervous reflex and strong muscle contraction caused tissue fracture and fracture mechanical injury; arc welding process, the industry protection is not the time, can make it happen an eye disease or make the metal particles penetrate the skin causing skin metallization; in addition, there is a more severe shock.
Q:Why do motors need capacitance when they start?
Only for single-phase AC motors, the rotating magnetic field is formed by the phase-shifting of the capacitor because a single winding can not form a rotating magnetic fieldA three-phase magnetic field is not needed, so a rotating magnetic field can be synthesizedHenryzheng2 | published on 2013-02-17 17:21

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