11KW YZTDseries for tower crane changing- poles multi -speed three-phase motor for tower crane

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Product Description:

 Packaging & Delivery

Packaging Details:   Carton/ Wooden box or according to customer's requirement

Delivery Detail:        Within 20 days after30% deposit

  1. Prompt Quotation, Competitive Price

  2. 100%tested, Guaranteed Quality, 100% copper wire,  Cold-rolled silicon steel sheet 

  3. Good performance. 

  4. Energy saving ,Long working life .

  5. motor with ISO9002-2000, CCC

YZTD Series is specially developed for tower crane and other construction machinery electric drives. It is up to the demand of  national standard GB755-87"the bisic technology demand of rotary electric motor"and industrial standard"YZTD variable poles multi speed three-phase motor for tower crane". the product's features are high speed ratio, low starting current, high starting torque, strong overload capacity, simply operation and convenient maintennance,etc.

 Detailed information:

  • Power range: 0.5-315kw.

  • Poles: 4//16/24.

  • Protecting level: IP44/IP54

  • Cooling way: IC411.

  • Installation way: B3 or customization.

  • Rated voltage: 380v / 440v.

  • Rated frequency: 50Hz/ 60Hz.

  • working method: high speed, medium speed S3-40%, low speed S3-25%.

  • Working temperature: F:-20°c to 40°c, H:  -20°c to 60°c .

  • Altitude:  lower than 1000m. 

  • Addition: Can be made according to your requirements


  • High efficiency and low energy consumption.

  • Low noise and vibrate.

  • Simple operation.

  • Easy maintenance.

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Q:Any 220V ac motor can be reversed?
The motor can be turned on and off, just changing the wiring, which is the connection between the switch and the capacitance
Q:Is the inductance of the stator winding of single phase ac motor constant?
The size of the coil inductance and itself by the size of the density of field lines, when the motor rotates the lines of magnetic force density was in a cyclical change, so the stator coil inductance also followed in periodically change.
Q:What is the starting method of ac motor?
1: the best conversion starts. 2: step-down start: autotransformer step-down start, start the stator resistance, start the motor rotor winding resistance, star Angle start, soft start (and step-down start), motor winding tap. 3: direct start
Q:Why does the motor need capacitance when the machine starts?
Only single phase ac motor USES capacitance, dc motor and three-phase ac motor do not need. The two single-phase motor coil does not produce a rotating magnetic field, must be in one of the series capacitance on the coil, make this branch of the current in another coil current in advance, the ability in a rotating magnetic field between the two coils, rotor rotation.
Q:What is the difference between ac motor and dc motor?
The difference between ac motor and dc motor: According to the structure, the principle of dc motor is relatively simple, but the structure is complex and not easy to maintain. Ac motor is complex but relatively simple, and is easier to maintain than dc motor. The dc motor introduces the current to the rotor armature through the brush and the commutator, so that the rotor can force the force in the stator field. Ac motor (commonly used ac asynchronous motor, for example) is to put the ac electric flux into the stator winding, thus in the rotor creates a rotating magnetic field in air gap, rotating magnetic field in the rotor winding induced current, which make the rotor spinning force produced in the stator magnetic field.
Q:What is the normal current of the three-phase motor of 3KW
Normal ac motor, including FM motor, is not allowed to be plugged. By the external characteristic curve of ac motor, the ac motor will generate a "subversive current" burning machine when plugging. At this time the converter, if the vector is controlled, the motor is plugged and the torque current is not controllable. I've done this experiment. If the speed of more than 5 hz, can control the torque current (size can be smooth adjustment), and, using the encoder feedback is better than not using encoder feedback.
Q:Why not use a commutator?
Because the dc motor changes the direction of the current through the commutator and the coil keeps rotating
Q:How does the current transformer in ac motor work?
The differential protection of ac motor is in the three-phase power supply (cabinet) of the motor, which is equipped with three current transformer: A1, B1, C1. At the end of the three-phase winding of the motor, there are three current transformers: A2, B2 and C2, before being linked to "neutral". The six current transformers are the same, and the secondary winding receives the differential protection relay. When the motor is working, A1, A2 is equal to zero, the difference is zero, and the differential protection relay has no output. (B1, B2, C1, C2) The proposal: still seek a book to see, as the electrical design personnel, should have more in-depth understanding, the Internet is difficult to get.
Q:The alternating current is constantly changing, and how is the ac motor going to be controlled?
There are many methods of rotating magnetic field, such as three-phase winding, single-phase shift phase, short circuit, pulse changing phase, etc.
Q:What is an ac induction motor
In the rotor, there is no direct input alternating current, and a conductor with closed circuit on the rotor. Do the relative motion of a rotating magnetic field and rotor, the rotor on the closing of the conductor cutting current lines of magnetic force, magnetic field and the current and the stator's rotating magnetic field interaction, so as to drive the rotor rotation. From the above narrative, the current in the rotor is induced by a stator rotating field, so it is called an induction motor

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