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3kw motor electrotech drives ltd mpanamboatra motera india

3kw motor electrotech drives ltd mpanamboatra motera india

Fampiharana motera miovaova matetika

At present, variable frequency speed regulation has become the mainstream speed regulation scheme, which can be widely used in all walks of life.

In particular, with the increasingly extensive application of frequency converters in the field of industrial control, the use of variable-frequency motors is also becoming more and more widely. It can be said that because of the advantages of variable-frequency motors over ordinary motors in variable-frequency control, it is not difficult for us to see variable-frequency motors where frequency converters are used.

Maotera Linear

The traditional "rotating motor + ball screw" feed transmission mode on the machine tool is difficult to make a breakthrough in the feed speed, acceleration, rapid positioning accuracy and other aspects due to the limitations of its own structure. It has been unable to meet the higher requirements of ultra-high speed cutting and ultra precision machining on the servo performance of the machine tool feed system. Linear motor directly converts electric energy into linear motion mechanical energy without any transmission device of intermediate conversion mechanism. The utility model has the advantages of large starting thrust, high transmission stiffness, fast dynamic response, high positioning accuracy, unlimited stroke length, etc. In the feed system of machine tool, the biggest difference between the direct drive of linear motor and the transmission of original rotating motor is that the mechanical transmission link from the motor to the workbench (carriage) is cancelled, and the length of the feed transmission chain of machine tool is shortened to zero. Therefore, this transmission mode is also called "zero transmission". It is precisely because of this "zero transmission" mode that the original rotating motor drive mode can not achieve the performance indicators and advantages.

1. High speed response

Because some mechanical transmission parts (such as lead screw) with large response time constant are directly cancelled in the system, the dynamic response performance of the whole closed-loop control system is greatly improved, and the response is extremely sensitive and fast.

2. fahatany

The linear drive system eliminates the transmission clearance and error caused by mechanical mechanisms such as lead screw, and reduces the tracking error caused by the lag of the transmission system during interpolation. Through the feedback control of linear position detection, the positioning accuracy of the machine tool can be greatly improved.

3. High dynamic stiffness due to "direct drive", it avoids the motion lag phenomenon caused by the elastic deformation, friction and wear of the intermediate transmission link and the reverse clearance during startup, speed change and reversing, and also improves its transmission stiffness.

3kw motor electrotech drives ltd mpanamboatra motera india

4. Fast speed, short acceleration and deceleration process

Since linear motors were first mainly used in maglev trains (up to 500km/h), there is no problem to meet the maximum feed speed (up to 60 ~ 100m/min or higher) of ultra-high speed cutting when they are used in the feed drive of machine tools. Due to the high-speed response of the above "zero transmission", the acceleration and deceleration process is greatly shortened. To achieve instant high speed when starting and instant stop when running at high speed. High acceleration can be obtained, generally up to 2 ~ 10g (g=9.8m/s2), while the maximum acceleration of ball screw transmission is generally only 0.1 ~ 0.5g.

5. The stroke length is not limited. By connecting the linear motor in series with the guide rail, the stroke length can be extended indefinitely.

6. The movement is quiet and the noise is low. Since the mechanical friction of transmission screw and other parts is eliminated, and the guide rail can adopt rolling guide rail or magnetic pad suspension guide rail (without mechanical contact), the noise will be greatly reduced during its movement.

7. High efficiency. Because there is no intermediate transmission link, the energy loss caused by mechanical friction is eliminated, and the transmission efficiency is greatly improved. Basic structure

1、 The structure of three-phase asynchronous motor is composed of stator, rotor and other accessories.

(1) Stator (stationary part)

1. Stator fototra

Function: it is a part of the magnetic circuit of the motor, and the stator winding is placed on it.

Structure: the stator core is usually punched and laminated by 0.35~0.5mm thick silicon steel sheets with insulating layer on the surface. Evenly distributed slots are punched in the inner circle of the core to embed the stator winding.

Stator core groove types are as follows:

Semi closed slot: the efficiency and power factor of the motor are high, but the winding embedding and insulation are difficult. It is generally used in small low-voltage motors. Semi open slot: it can be embedded into the formed winding, which is generally used for large and medium-sized low-voltage motors. The so-called formed winding means that the winding can be put into the slot after insulation treatment in advance.

Open slot: it is used to embed the formed winding. The insulation method is convenient. It is mainly used in high-voltage motors.

2. Stator mihodina

Function: it is the circuit part of the motor, which is connected with three-phase AC to generate rotating magnetic field.

Structure: it is composed of three windings with exactly the same structure arranged at an electrical angle of 120 ° apart from each other in space. Each coil of these windings is embedded in each slot of the stator according to a certain law.

The main insulation items of the stator winding are as follows: (ensure the reliable insulation between the conductive parts of the winding and the iron core and between the winding itself).

1) Ground insulation: insulation between stator winding and stator core.

2) Phase to phase insulation: insulation between stator windings of each phase.

3) Turn to turn insulation: insulation between turns of each phase stator winding.

Wiring in motor junction box:

There is a terminal block in the motor junction box. The six wire ends of the three-phase winding are arranged in upper and lower rows. It is specified that the numbers of the three terminal posts in the upper row arranged from left to right are 1 (U1), 2 (V1), 3 (W1), and the numbers of the three terminal posts in the lower row arranged from left to right are 6 (W2), 4 (U2), 5 (V2) Connect the three-phase winding into star connection or triangle connection. All manufacturing and maintenance shall be arranged according to this serial number.

3kw motor electrotech drives ltd mpanamboatra motera india

3.frame

Function: fix the stator core and front and rear end covers to support the rotor, and play the role of protection and heat dissipation.

Structure: the frame is usually cast iron, the frame of large asynchronous motor is usually welded with steel plate, and the frame of micro motor is made of cast aluminum. There are heat dissipation ribs outside the frame of the closed motor to increase the heat dissipation area, and the end covers at both ends of the frame of the protective motor are provided with ventilation holes, so that the air inside and outside the motor can flow directly to facilitate heat dissipation.

(2) Rotor (rotating part)

1. Votoatin'ny motera maotera tsy misy ifandraisany:

Function: as a part of the magnetic circuit of the motor and place the rotor winding in the iron core slot.

Structure: the material used is the same as that of the stator. It is made of 0.5mm thick silicon steel sheet punched and laminated. The outer circle of the silicon steel sheet is punched with evenly distributed holes to place the rotor winding. Usually, the stator core is used to punch the backward inner circle of silicon steel sheet to punch the rotor core. Generally, the rotor core of small asynchronous motors is directly pressed on the shaft, while the rotor core of large and medium asynchronous motors (rotor diameter is more than 300~400 mm) is pressed on the shaft with the help of the rotor support.

2. Fanodinana rotor an'ny motera asynchronous dingana telo

Function: cutting the stator rotating magnetic field to generate induced electromotive force and current, and form electromagnetic torque to make the motor rotate.

Structure: divided into squirrel cage rotor and wound rotor.

1) Squirrel cage rotor: the rotor winding is composed of multiple guide bars inserted into the rotor slot and two circular end rings. If the rotor core is removed, the whole winding looks like a squirrel cage, so it is called a cage winding. Small cage motors are made of cast aluminum rotor winding. For motors above 100kW, copper bars and copper end rings are welded.

2) Wound rotor: the wound rotor winding is similar to the stator winding, and is also a symmetrical three-phase winding, which is generally connected into a star. The three outlet heads are connected to the three collector rings of the rotating shaft, and then connected with the external circuit through the brush.

Features: the structure is complex, so the application of wound motor is not as wide as that of squirrel cage motor. However, additional resistors and other elements are connected in series in the rotor winding circuit through the collector ring and brush to improve the starting, braking and speed regulation performance of the asynchronous motor, so they are used in the equipment requiring smooth speed regulation within a certain range, such as cranes, elevators, air compressors, etc.

 

3kw motor electrotech drives ltd mpanamboatra motera india

(3) Other accessories of three-phase asynchronous motor

1. End cap: supporting function.

2. Bearing: connecting the rotating part and the stationary part.

3. Bearing end cap: protect the bearing.

4. Fan: cooling motor.

2、 The DC motor adopts octagonal fully laminated structure, which not only has high space utilization, but also can withstand pulsating current and rapid load current change when the static rectifier is used for power supply. DC motor generally does not have series excitation winding, which is suitable for automatic control technology requiring forward and reverse motor rotation. It can also be made into series wound winding according to the needs of users. Motors with a center height of 100 ~ 280mm have no compensation winding, but motors with a center height of 250mm and 280mm can be made with compensation winding according to specific conditions and needs. Motors with a center height of 315 ~ 450mm have compensation winding. The overall installation dimension and technical requirements of the motor with center height of 500 ~ 710mm shall comply with IEC international standards, and the mechanical dimension tolerance of the motor shall comply with ISO international standards.

Fomba fanaraha-maso

Inspection method before starting:

1. For new or long-term inactive motors, the insulation resistance between windings and winding to ground shall be checked before use. Generally, 500V insulation resistance meter is used for motors below 500V; 1000V insulation resistance meter for 500-1000v motor; Use 2500V insulation resistance meter for motors above 1000V. The insulation resistance shall not be less than 1m Ω per kilovolt working voltage and shall be measured when the motor is cooled.

2. Check whether there are cracks on the surface of the motor, whether all fastening screws and parts are complete, and whether the motor is well fixed.

3. Check whether the motor drive mechanism works reliably.

4. According to the data shown on the nameplate, whether the voltage, power, frequency, connection, speed, etc. are consistent with the power supply and load.

5. Check whether the ventilation and bearing lubrication of the motor are normal.

6. Pull the motor shaft to check whether the rotor can rotate freely and whether there is noise during rotation.

7. Check the brush assembly of the motor, whether the brush lifting mechanism is flexible, and whether the position of the brush lifting handle is correct.

8. Check whether the motor grounding device is reliable.

Fenitra indostrialy

Gb/t 1993-1993 cooling methods for rotating electrical machines

GB 20237-2006 safety requirements for hoisting metallurgy and shielded motors

Gb/t 2900.25-2008 Electrotechnical terminology rotating electrical machines

Gb/t 2900.26-2008 Electrotechnical terminology -- control motors

GB 4831-1984 motor product model compilation method

GB 4826-1984 motor power class

Jb/t 1093-1983 Basic test methods for traction motors

3kw motor electrotech drives ltd mpanamboatra motera india

Tanjona lehibe

1. Servo maotera

Servo motor is widely used in various control systems. It can convert the input voltage signal into the mechanical output on the motor shaft, and drive the controlled components to achieve the control purpose.

Servo motor can be divided into DC motor and AC motor. The earliest servo motor was a general DC motor. When the control accuracy was not high, the general DC motor was used as the servo motor. In terms of structure, the current DC servo motor is a low-power DC motor. Its excitation mostly adopts armature control and magnetic field control, but it usually adopts armature control.

2. Manidina maotera

Stepper motor is mainly used in the field of NC machine tool manufacturing. Because stepper motor does not need a/d conversion and can directly convert digital pulse signal into angular displacement, it has been considered as the most ideal actuator of NC machine tool.

In addition to its application in CNC machine tools, stepper motors can also be used in other machines, such as motors in automatic feeders, motors in general floppy disk drives, and printers and plotters.

3. Torque maotera

Torque motor has the characteristics of low speed and large torque. In general, AC torque motor is often used in textile industry. Its working principle and structure are the same as that of single-phase asynchronous motor.

4. Moteur tsy hivoahana

Switched reluctance motor (SRM) is a new type of adjustable speed motor, which has simple and firm structure, low cost and excellent adjustable speed performance. It is a strong competitor of traditional control motor and has a strong market potential.

5. maotera DC tsy misy borosy

Brushless DC motor has good linearity of mechanical characteristics and regulation characteristics, wide speed regulation range, long service life, convenient maintenance, low noise, and no series of problems caused by brush. Therefore, this motor has great application in control system.

6. maotera DC

DC motor has the advantages of good speed regulation performance, easy starting and load starting, so DC motor is still widely used, especially after the emergence of SCR DC power supply.

7. Moto tsy mifangaro

Asynchronous motor has the advantages of simple structure, convenient manufacture, use and maintenance, reliable operation, low quality and low cost. Asynchronous motors are widely used to drive machine tools, water pumps, blowers, compressors, hoisting equipment, mining machinery, light industrial machinery, agricultural and sideline products processing machinery and other industrial and agricultural production machinery, as well as household appliances and medical devices.

It is widely used in household appliances, such as electric fans, refrigerators, air conditioners, vacuum cleaners, etc.

8. Moto mitambatra

Synchronous motors are mainly used in large machinery, such as blowers, water pumps, ball mills, compressors, rolling mills, small and micro instruments and equipment, or as control elements. The three-phase synchronous motor is its main body. In addition, it can also be used as a condenser to transmit inductive or capacitive reactive power to the power grid.

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