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Single phase induction motor manufacturers in india

Single phase induction motor manufacturers in india

Single-phase induction motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC power supply (AC220V). Its power is designed to be relatively small, generally not greater than 2kW. Single-phase asynchronous motors account for most of the small-power asynchronous motors and have been modified four times, that is, they have undergone four unified designs. Different occasions have very different requirements for motors, so it is necessary to adopt various types of motor products to meet the requirements of use.

Generally, single-phase asynchronous motors are divided into the following five types according to the characteristics of the starting and operating modes of the motor.
1. Single-phase resistance starts induction motor. Code name JZ BO BO2
2. Single-phase capacitor start induction motor. Code name JY CO CO2 New code name: YC
3. Single-phase capacitor operation induction motor. Code JX DO DO2 New code: YY
4. Single-phase capacitor starts and runs induction motors. Code YL
5. Single-phase shaded pole induction motor.

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Because the output power of the motor is not large, the rotor of a single-phase induction motor generally uses a squirrel-cage rotor, and its stator has a set of working windings, called the main winding stage. It can only produce positive in the air gap of the motor. Negative alternating pulsating magnetic field cannot produce rotating magnetic field, therefore, it cannot produce starting torque. In order to generate a rotating magnetic field in the air gap of the motor, a set of auxiliary windings, called secondary windings, is also required. Because the magnetic field generated by the secondary winding and the magnetic field of the main winding synthesize and generate a rotating magnetic field in the motor air gap, the motor generates a rotating magnetic field. Starting torque, therefore, the rotor of the motor can turn on its own.


Resistance start
Its stator is embedded with a main phase winding and a secondary phase winding, and the two windings form a 90-degree electrical angle with the axis in space. The secondary phase winding is generally connected in series with an external resistance through the centrifugal start, connected in parallel with the main phase winding, and connected to the power supply together. When the motor is started and the speed reaches 75% to 80% of the synchronous speed, the centrifuge is opened and the centrifugal switch piece contact is de-energized.

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Capacitor start
It is basically the same as the single-phase resistance starter motor. There are two sets of windings with the main phase and the auxiliary phase forming a 90-degree electrical angle on the stator. The secondary winding and the external capacitor are connected to a centrifugal switch, connected in parallel with the main winding, and connected to the power supply together. Similarly, when reaching 75% to 80% of the synchronous speed, the secondary winding is cut off to become a single-phase motor. The power of this motor is 120W~750W.


Capacitor operation
The stator windings of this motor are also two sets of windings, and the structure is basically the same. The operating technical indicators of the capacitor-operated motor are better than those of other types of motor before. Although it has good running performance, the starting performance is relatively poor, that is, the starting torque is lower, and the larger the motor capacity, the smaller the ratio of starting torque to rated torque. Therefore, the capacity of the capacitor running motor is not large, generally less than the range of 180W.
Single-phase capacitor start and run asynchronous motor
This kind of motor connects two capacitors in the secondary winding. One of the capacitors passes through the centrifugal switch and cuts off the power after starting; the other always participates in the work of the secondary winding. Among these two capacitors, the starting capacitor has a large capacity, while the running capacitor has a small capacity. This single-phase capacitor starting and running motor combines the advantages of single-phase capacitor starting and capacitor running motors. Therefore, this motor has better starting performance and running performance. In the same frame size, the power can be increased by 1 to 2 The power can reach 1.5~2.2kW.

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Single phase shaded pole
It is an induction motor with a simple structure, generally using a salient pole stator, the main winding is a concentrated winding, and the secondary phase winding is a single-turn short-circuit ring, called a shaded coil. The performance of this kind of motor is poor, but due to its solid structure and low price, the production volume of this kind of motor is still very large, but the output power generally does not exceed 20W.

The working principle of single-phase asynchronous motor:
The capacitor separates the single-phase alternating current into another alternating current with a phase difference of 90 degrees in the motor through the capacitive phase shifting effect. The two-phase alternating current is fed into two or four sets of motor coil windings, and a rotating magnetic field is formed in the motor. The rotating magnetic field generates an induced current in the motor rotor. The magnetic field generated by the induced current is opposite to the rotating magnetic field, and the rotating magnetic field Push and pull into the rotating state.
Single-phase electricity cannot produce a rotating magnetic field. To make a single-phase motor rotate automatically, a starting winding can be added to the stator. The starting winding and the main winding are spaced apart by 90 degrees. The starting winding should be connected in series with a suitable capacitor. Make the current of the main winding approximately 90 degrees out of phase, the so-called principle of phase separation. In this way, two currents with a 90-degree difference in time pass through two windings with a 90-degree difference in space, and a (two-phase) rotating magnetic field will be generated in space. Under the action of this rotating magnetic field, the rotor can automatically start.

3 phase induction motor 8The single-phase asynchronous motor has no starting torque and cannot start by itself. It is necessary to try to start it, that is, try to make it generate a rotating magnetic field. According to different starting methods, common single-phase motors are divided into the following three categories.
1. Split-phase start motor
Split-phase starting motors are divided into resistance split-phase starting motors and capacitor split-phase starting motors. At startup. A resistor (or the auxiliary winding itself is greater than the resistance of the main winding) or a capacitor is used in the auxiliary winding of the motor. When the motor speed reaches about 80% of the synchronous speed, the starting winding or capacitor is disconnected from the power supply by the starter. The one that makes the resistance take off the power is called the resistance split-phase starting motor, and the one that makes the capacitor off the power supply is called the capacitor split-phase starting motor.
2. Capacitor running motor
The capacitor runs the motor, and the auxiliary winding and capacitor are not removed during operation. Auxiliary windings and capacitors should be calculated and selected according to the long-term connection to the motor.
3. Shaded pole motor
A short-circuit copper ring or short-circuit coil is used to cover 1/4 to 1/3 of the magnetic pole to generate a rotating magnetic field to start a single-phase motor. This kind of motor is called a shaded pole motor. Shaded pole motors do not require starting devices and capacitors.

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Common sense of motor protection
1. Motors are easier to burn out than in the past: Due to the continuous development of insulation technology, the design of motors requires both increased output and reduced size, so that the heat capacity of the new motor is getting smaller and the overload capacity is getting weaker; Due to the increase in the degree of production automation, the motors are required to run frequently in various ways such as frequent starting, braking, forward and reverse rotation, and variable load, which puts forward higher requirements for motor protection devices. In addition, the motor has a wider range of applications, often working in extremely harsh environments, such as humidity, high temperature, dust, and corrosion. All of these make the motor more prone to damage, especially the highest frequency of faults such as overload, short circuit, phase loss, and bore scanning.
2. The protection effect of the traditional protection device is not ideal: the traditional motor protection device is mainly thermal relay, but the thermal relay has low sensitivity, large error, poor stability and unreliable protection. The fact is also true. Although many devices are equipped with thermal relays, the phenomenon of damage to the motor that affects normal production is still widespread.
3. Current status of the development of motor protection: Motor protectors have evolved from mechanical types in the past to electronic and intelligent types, which can directly display the current, voltage, temperature and other parameters of the motor, with high sensitivity, high reliability, multiple functions, and convenient debugging. , After the protection action, the types of faults are clear at a glance, which not only reduces the damage of the motor, but also greatly facilitates the judgment of the fault, which is beneficial to the fault handling at the production site and shortens the recovery time. In addition, the use of motor air gap magnetic field for motor eccentricity detection technology makes it possible to monitor the motor wear status online. The curve shows the change trend of the motor eccentricity degree, which can early detect bearing wear, internal circle, external circle and other faults. Early detection, early treatment, to avoid sweeping accidents.

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3. The principle of protector selection: reasonable selection of motor protection devices to realize the full use of the motor's overload capacity and avoid damage, thereby improving the reliability of the electric drive system and the continuity of production. The specific function selection should comprehensively consider the value of the motor itself, the load type, the use environment, the importance of the main equipment of the motor, whether the motor exits operation will cause a serious impact on the production system and other factors, and strive to be economically reasonable.
4. The ideal motor protector: The ideal motor protector is not the most functional, nor the so-called most advanced, but should meet the actual needs of the site, achieve the unity of economy and reliability, and have a higher cost performance. Choose the type and function of the protector reasonably according to the actual situation of the site, and consider the simple and convenient installation, adjustment and use of the protector, and more importantly, choose the high-quality protector.
Selection of protector
Basic principles of selection:
There is no unified standard for motor protection products on the market, and there are various models and specifications. In order to meet the different needs of users, manufacturers derive many series of products, which have a wide variety of products, which brings a lot of inconvenience to the selection of users; users should fully consider the actual needs of motor protection when selecting models, and choose protection functions and methods reasonably. In order to achieve a good protection effect, achieve the purpose of improving the reliability of equipment operation, reducing unplanned shutdowns, and reducing accident losses.

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The basic method of selection:
1. Conditions related to selection
1) Motor parameters: You must first understand the motor specifications, functional characteristics, protection type, rated voltage, rated current, rated power, power frequency, insulation class, etc. These contents can basically provide a reference basis for the user to correctly choose the protector.
2) Environmental conditions: Mainly refer to room temperature, high temperature, high cold, corrosion, vibration, wind and sand, altitude, electromagnetic pollution, etc.
3) Motor use: Mainly refers to the required characteristics of the driving mechanical equipment, such as fans, water pumps, air compressors, lathes, oil field pumping units and other mechanical characteristics of different loads.
4) Control mode: The control modes include manual, automatic, local control, remote control, stand-alone independent operation, and centralized control of production lines. Start-up methods include direct, step-down, star angle, frequency sensitive rheostat, frequency converter, soft start, etc.
5) Other aspects: the user's monitoring and management of on-site production, the severity of the impact of abnormal shutdowns on production, etc.

There are many factors related to the selection of the protector, such as installation location, power supply situation, power distribution system situation, etc.; also consider whether to configure protection for newly purchased motors, upgrade motor protection, or improve protection for accidental motors, etc. ; Also consider the difficulty of changing the motor protection mode and the degree of impact on production; it is necessary to comprehensively consider the selection and adjustment of the protector according to the actual working conditions on site.

XWD

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