YTDVF Variable一Frequency Three一Phase Asynchronous Motor for Tower Crane Amplitude Mechanism

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Overview


the motor is a variable-frequency, three-phase asynchronous motor exclusively designed for the tower cranes and other similar amplitude mechanisms. It is applied to the
amplitude mechanisms in very harsh working conditions such as construction site or open pit quarry

Features

With introduction of spline output shat, it has good mechanical bearing capacity and excellent assembly performance;
Motor installation interface has the same size with original tower crane (POITAIN series), making it easier for switching and upgrading of old products

The motor is a variable-frequency motor featuring a wide range of speed regulation, small starting current, big starting torque and overload ability;
A thermal protection component is buried into the in stator winding and wired into the motor temperature protection control system, making motor more safer and reliable;
New brake (national utility model ZL201101881732, ZL201120188164.3) with higher safety and reliability this reduces the maintenance time and cost compact structure, small volume, lightweight as well as high reliability, so it can be braked quickly and positioned accurately. It is suitable for frequent starting and raking


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Q:What are the stator and rotor functions of an alternating current motor?
The role of the stator of an alternating current motor is:As part of the magnetic circuit of the motor and embedded stator windings. The stator core is laminated by 0.5mm thick silicon steel sheet, and the two sides of the brick and steel sheet are coated with insulating paint to insulate the sheets and sheets so as to reduce the core loss caused by the rotating magnetic field in the stator core. A plurality of same grooves are punched inside the stator core to be inserted into the stator winding.
Q:What is the difference between the excitation winding and armature winding of AC motor?
Only synchronous generator and synchronous motor have excitation winding and armature winding. In general, AC induction motors do not have field windings. The asynchronous motor is divided into two major categories, squirrel cage and winding. The stator winding structure is the same. The squirrel cage rotor is a squirrel cage, and the winding rotor is a coil (which can be changed by an external device to change the rotor impedance).
Q:The difference between synchronous motor and asynchronous motor
Induction motor, also known as asynchronous motor, that is, the rotor in rotating magnetic field, in the rotating magnetic field under the action of a moment of rotation, and thus rotor rotation. The rotor is a rotatable conductor, usually in the shape of a mouse cage. Invented by Nicola Tesla, an electrical engineer in 1887.The induction motor is also called asynchronous motor, that is, the rotor is placed in a rotating magnetic field, and a rotational torque is obtained under the action of the rotating magnetic field, so that the rotor rotates.
Q:The working principle of AC motor!
The single-phase AC motor has only one winding, and the rotor is squirrel cage. When a single-phase sinusoidal current through the stator windings, the motor generates an alternating magnetic field, the magnetic field strength and direction for sinusoidal variation with time, but the spatial position is fixed, so it is also called the magnetic field is alternating pulsating magnetic field. The alternating pulsating magnetic field can be divided into two with the same speed, the rotation direction of the rotating magnetic field are on the contrary, when the rotor is at rest, the two rotating magnetic field generating torque of two equal and opposite in the rotor, the synthetic torque is zero, so the motor rotation. When we use a force of the motor rotation to one direction (e.g., clockwise), the rotor and the clockwise rotation direction of the rotating magnetic field between the motion of cutting magnetic lines becomes smaller; the rotor and the counterclockwise rotation direction of the rotating magnetic field between the motion of cutting magnetic lines becomes large. Thus, the balance is broken, and the total electromagnetic torque generated by the rotor will no longer be zero, and the rotor will rotate in the direction of the push.
Q:Why is Tesla's Model s electric vehicle using AC motor instead of the more popular frequency conversion DC motor?
1, the DC motor structure is complex, the cost is relatively high, late maintenance trouble.2, larger motors are required to be connected to large cooling fans.3, it can realize the speed regulation simply and economically. Big torque and good mechanical characteristics.4, AC motor structure is simple, low cost, simple maintenance. You can't speed it yourself. In the past, the frequency conversion was not timely, and the DC motor was used in places requiring good speed control (machine tools, cranes, textiles, etc.).
Q:AC speed regulation motor + turbo reducer instead of cam cutter + AC motor?
If the worm gear reducer is used, though the worm gear pair can be made in reverse direction, the backlash of the worm gear will cause errors, i.e. backlash. The backlash generated by the backlash of the worm gear is much larger than the error of the cam cutter. Generally, the back clearance of the ordinary worm gear reducer can reach over 15 arc points. That would be a difference of 1/4 degrees. If the rotary disc diameter is large, the backlash is very terrible, the center deviation 1/4 degrees, the radius of 500 place would be how much can calculate. Therefore, the use of worm, generally have aided detection apparatus, using a switch to detect the position you want to stop, such as detection photoelectric switch block inspection of several indexing arrangement, to immediately stop the motor stop in the detection signal. However, due to the inertia of the motor, there will be a bit of overshoot after stopping. Therefore, it is necessary to put some parameters into the design, and then to design the fast position for the adjustable structure.
Q:What's the UVW representative of the motor, please?
Three phase alternating current is a form of transportation of electrical energy, referred to as three-phase electricity. Three phase AC power supply is composed of three alternating current potential with the same frequency, equal amplitude and phase difference of 120 degrees. There are many uses of three-phase alternating current. Most of the AC power equipments in industry, such as motors, adopt three-phase alternating current, which is often referred to as the three-phase four wire system. In daily life, the use of single-phase power supply, also known as lighting electricity. When the lighting power supply, use three-phase electricity one relative to supply electrical equipment, such as household appliances, while the other one is the line of three-phase four wire fourth wire, which is the zero line and the zero line drawn from the neutral point of the three-phase power.
Q:How to connect the AC motor?
There are two kinds of three-phase AC motorStar: the three connecting terminals are connected with three phase lines of the three-phase power supply, and the three terminals are shorted together with wires or metal pieces.
Q:What is the reason that the single phase AC motor is turned on and off?
Exclusive use only. Check the switch first, is there any bad contact?. After the problem of the switch is removed, the power is turned on, and whether the cold state can run normally every time. If there is a phenomenon that the cold condition can not work properly, the internal circuit or winding is not working. If the cold running is normal and the use of a period of time does not turn, and then use the hand to touch the motor whether the fever is serious, such as temperature is too high, the heat protector is broken, and so the motor can be turned cold. This phenomenon should check whether the no-load and load resistance of the motor is too large, whether or not the winding has a short turn between the two places, causing the temperature rise too high.The two capacitors on the motor, one is the starting capacitor, the other is the operating capacitor, which produces phase difference. The starting capacitor is only connected to the circuit when the motor is started, and it is disconnected when it is running normally. The operating capacitor is always connected to the circuit.
Q:Causes of insulation breakdown in AC motor voltage withstand test
Not in accordance with the provisions of pressure, or pressure, the motor damp, without drying and so on.

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