ABB High Voltage AC Motor

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Q:basic difference between normal and servo motor?
The two answers are right to some degree but my answer to the question would be as follows. Electric motors fall into to categories (industrial and servo) because the two types of motor have different performance requirements. The industrial machine is not normally required to have high acceleration and deceleration and is required to perform continuously for long periods. The servo motor is the GTI of the motor world and needs to have high accel/decel capability, good duty cycle performance. Both types of motors can have devices attached to give them extra capabilities. It is normal for a servo motor to have some form of rotor position measuring device (resolver or encoder). Industrial machines can also have simliar devices because with the advances in drive technology , modern drives can control the position of industrial machines. When looking at AC or DC in either category, generally DC motors have brushes that require maintenance every 2 years or so. AC motors do not have brushes. AC motors have the windings on the stator of the machine and heat can excape easily from the motor. DC machines generally have the high current carrying windings on the rotor and heat is difficult to extract without blowing air thorough the motor. AC machines should be generally considered as 1st choice for a new project in this century.
Q:why do universal motors work on ac and dc?
Any motor needs two (one stationary and one rotating) magnetic fields that interact to produce the torque. In a universal motor both magnetic fields are produced by the same current passing through both the field coils and the armature coils, in series. Since attraction does not depend on what the poles are, but only that they are different (N and S or S and N) and repulsion depends not on what the poles are, but only that they are the same (N and N or S and S). So regardless of which way the current flows, both the stationary and rotating poles reverse simultaneously, so opposites are not changed to sames and vice versa. So the direction of the torque is independent of the common current direction. -- Regards, John Popelish
Q:How to build an digital AC ammeter for 3 phase motor?
you may have already found what you were looking for on google by now, none the less I think I can help you. I do not have a circuit schematic but I worked on a similar project not too long ago. To monitor the current you can use 3 current transformers to clamp on the 3 phases. A current transformer is a transducer that will convert the current in the phase to a voltage output signal. The output signal will be low level AC so you will need to rectify and convert the signal to a steady DC signal. (this can be done very easily by using a single diode rectifier and a low pass filter, you may also require an amplifier) once all 3 current signals are converted to a steady DC voltage signal that is proportional to the line current, you run the signals into a PIC micro-controller and interface an LCD display to the micro-controller. You can then write simple code to convert the 3 analog input signals to the proper RMS current values and then output it to the LCD. Hope this helps.
Q:Why does my 90w DC motor start smoking when connected to 230V AC with no load. Is it because of no load or? I got a rectifying diode with it?
GOOD EXPERIMENT AND YOU BURNT IT WELL ! WHAT IS THE DC MOTOR VOLTAGE RATING ?? HOW MANY RECTIFIER YOU USED ? HOW YOU CONSTRUCTED THE RECTIFY CIRCUIT? HALFWAVE OR FULLWAVE ? FULLWAVE PRODUCES 207Vdc ! HALFWAVE PRODUCES ABOUT 115Vdc, BUT NOT GOOD TO RUN DC MOTOR WITH HALFWAVE. YOUR DC MOTOR IS GONE, TRY ANOTHER ONE THAT MATCH WITH THE VOLTAGE.
Q:does vooltage change affect rpm of motor?
I agree with the previous answer. Also, In an induction motor when you lower the voltage the current will increase to compensate and attempt to keep the motor running. With AC motors, in order to regulate the speed, one has to use a Variable Frequency Drive or VFD. The VFD can change the frequency, and hense, speed, in order to keep up with a certain demand. Often they are used on water pump stations and conveyor belts where the demand for product may change.
Q:What are some common machines that run on AC motors, and some that run on DC motors? ?
Actually, the transformer changes the AC voltage to another AC voltage. The part that changes it to DC is called the rectifier, which can either block AC of the wrong polarity, or change the polarity of the AC pulses to all be of the same polarity (a bridge rectifier does this). After rectification, the voltage is no longer AC but pulsing DC. You can then add a filter of some kind, like a large capacitor, to smooth out the pulses into a steady DC output.
Q:AC Direct Drive Motor question?
AC okorder.com
Q:Why capacitor is needed in single phase ac motor?
The capacitor in series with the starting winding on a cap-start induction motor is there to create a lag in the current through this winding relative to the run winding. The two coils fields are thus a little bit out of phase with each other, which imparts a little bit of direction to the overall magnetic field. Essentially, it creates a second phase. This is required, since with only one coil (one phase) all attraction and repulsion between the coil and the induced field in the rotor would be exactly perpendicular to the motor shaft. The field has to be have some component tangential to the shaft to start things rotating.
Q:How did the electric motor change the world?
When the electric motor Faraday invented is turned into a turbine; run by wind, water, steam, etc. it becomes a generator and produces alternating current. Thus his electrical motor design has a two-fold purpose. Many products have motors running on the same principle today - vacuum cleaners, power saws and so on - even heating and air conditioning units which force air through buildings and homes.
Q:what type of motor that we use in car?
dc that is what it is desighned for

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