Imported DOHLE sewing machine needle 010494

Imported DOHLE sewing machine needle 010494

Imported DOHLE sewing machine needle 010494

Jiangsu Qiucheng Electromechanical Co., Ltd

Professional procurement of European industrial control products and spare parts.

Advantages of Supply Brands and Models: Wurth Hardware Tools and Chemicals, Hahn Cooper, Gaimi Valves, Schmeisser Switches, IMM Nozzles, Ergowiss Hydraulic Lift Systems, Socla Valves, Kobold Flow Meter Switches, SBS Balancing Devices, ODU Connectors, SCHURTER Filters, AMF Fixtures, Phoenix Wig Miller Terminal Connectors, Bentley Envision Module Cards, etc

Our advantages:

1) Purchase directly from the manufacturer to ensure that all products are original.

2) Reasonably priced, bypassing layers of agents, maximizing discounts to customers.

3) We have a wide range of channels, with agents in China or customers protecting manufacturers from selling products. As long as you can provide the model, we can also purchase from distributors in various countries.

4) The warehouse ships consolidated shipments every Wednesday, greatly saving logistics costs.

5) Engineers provide you with professional pre-sales and after-sales technical consulting services.

Jiangsu Qiucheng Electromechanical Co., Ltd. is a modern enterprise that integrates research and development, engineering, sales, and technical services. It is a competitive equipment supplier in the field of automation in China. The company mainly deals in industrial automation products such as mechatronics equipment, high-precision analytical and testing instruments, environmental and new energy industrial equipment, and electric tools from developed countries such as Europe, America, Japan, and South Korea.

1、 AC asynchronous motor

AC asynchronous motor is an electric motor that operates with AC voltage and is widely used in household appliances such as electric fans, refrigerators, washing machines, air conditioners, hair dryers, vacuum cleaners, range hoods, dishwashers, electric sewing machines, food processing machines, as well as various power tools and small electromechanical equipment.

AC asynchronous motors are divided into induction motors and AC commutator motors. Induction motors are divided into single-phase asynchronous motors, AC/DC dual-purpose motors, and repulsion motors.

The speed of the motor (rotor speed) is less than the speed of the rotating magnetic field, hence it is called an asynchronous motor. It is basically the same as an induction motor. s=(ns-n)/ns。 S is the slip rate,

Ns is the magnetic field speed, and n is the rotor speed.

Basic principle:

1. When a three-phase asynchronous motor is connected to a three-phase AC power supply, the three-phase stator winding generates a three-phase magnetic electromotive force (stator rotating magnetic electromotive force) by flowing three-phase symmetrical currents and produces a rotating magnetic field.

2. The rotating magnetic field has relative cutting motion with the rotor conductor. According to the principle of electromagnetic induction, the rotor conductor generates induced electromotive force and induced current.

3. According to the law of electromagnetic force, the current carrying rotor conductor is subjected to electromagnetic force in a magnetic field, forming electromagnetic torque that drives the rotor to rotate. When there is a mechanical load on the motor shaft, mechanical energy is output outward.

Asynchronous motor is an AC motor, and the ratio of its speed under load to the frequency of the connected power grid is not a constant relationship. It also changes with the size of the load. The greater the load torque, the lower the rotor speed. Asynchronous motors include induction motors, doubly fed asynchronous motors, and AC commutator motors. Induction motors can generally be referred to as asynchronous motors in applications that do not cause misunderstandings or confusion.

The stator winding of a regular asynchronous motor is connected to the AC power grid, and the rotor winding does not need to be connected to other power sources. Therefore, it has the advantages of simple structure, easy manufacturing, use and maintenance, reliable operation, low quality, and low cost. Asynchronous motors have high operating efficiency and good working characteristics, operating at near constant speed from no-load to full load range, which can meet the transmission requirements of most industrial and agricultural production machinery. Asynchronous motors are also convenient for generating various types of protection to meet the needs of different environmental conditions. When an asynchronous motor is running, it must draw reactive excitation power from the power grid to deteriorate the power factor of the grid. Therefore, synchronous motors are often used to drive high-power, low-speed mechanical equipment such as ball mills and compressors. Due to the certain slip relationship between the speed of asynchronous motors and their rotating magnetic field speed, their speed regulation performance is poor (except for AC commutator motors). For transportation machinery, rolling mills, large machine tools, printing and dyeing, and papermaking machinery that require a wide and smooth speed range, using DC motors is more economical and convenient. But with the development of high-power electronic devices and AC speed regulation systems, the speed regulation performance and economy of asynchronous motors suitable for wide speed regulation can now be comparable to those of DC motors.

2、 Single-phase asynchronous motor

A single-phase asynchronous motor consists of a stator, rotor, bearings, casing, end caps, etc.

The stator is composed of a machine base and an iron core with windings. The iron core is made of stacked silicon steel sheets punched in grooves, and two sets of main windings (also known as running windings) and auxiliary windings (also known as starting windings forming auxiliary windings) are embedded in the grooves at a 90 ° electrical angle to each other. The main winding is connected to the AC power supply, and the auxiliary winding is connected in series with the centrifugal switch S or the starting capacitor, running capacitor, etc. before being connected to the power supply.

The rotor is a cage shaped cast aluminum rotor, which is made by stacking iron cores and casting aluminum into the slots of the iron cores, and casting end rings together to short-circuit the rotor bars into a squirrel cage shape.

Single phase asynchronous motors are divided into single-phase resistance starting asynchronous motors, single-phase capacitor starting asynchronous motors, single-phase capacitor running asynchronous motors, and single-phase dual value capacitor asynchronous motors.

3、 Three phase asynchronous motor

The structure of a three-phase asynchronous motor is similar to that of a single-phase asynchronous motor, with three-phase windings embedded in the stator core slots (including single-layer chain, single-layer concentric, and single-layer cross structures). After the stator winding is connected to the three-phase AC power supply, the rotating magnetic field generated by the winding current induces a current in the rotor conductor. Under the interaction of the induced current and the rotating magnetic field in the air gap, the rotor generates an electromagnetic converter (i.e. asynchronous converter), which rotates the motor.

4、 Covered pole motor

A covered pole motor is a type of unidirectional AC motor that typically uses a cage shaped slotted cast aluminum rotor. It is further divided into salient pole shaded pole motor and hidden pole shaded pole motor based on the different stator shape structures.

The stator core of a salient pole shaded pole motor has a square, rectangular, or circular magnetic field frame, with protruding magnetic poles and one or more auxiliary short-circuit copper rings on each pole, known as shaded pole windings. The concentrated winding on the salient pole serves as the main winding.

The stator core of the hidden pole covered pole motor is the same as that of the ordinary single-phase motor. The stator winding adopts distributed winding, and the main winding is distributed in the stator slot. The covered pole winding does not use a short-circuit copper ring, but is wound with thicker enameled wire to form a distributed winding (self short circuited after series connection) and embedded in the stator slot (about 2/3 of the total number of slots), playing the role of an auxiliary group. The main winding and the shield winding are spaced at a certain angle in space.

When the main winding of the covered pole motor is energized, the covered pole winding will also generate induced current, causing the magnetic flux of the stator pole covered by the covered pole winding and the uncovered part to rotate in the direction of the covered part.

5、 Single-phase series excited motor

The stator of a single-phase series excited motor consists of a salient pole iron core and an excitation winding, while the rotor consists of a hidden pole iron core, armature winding, commutator, and shaft. A series circuit is formed between the excitation winding and the armature winding through electric brushes and commutators.

Single phase series excited motors belong to dual-purpose AC and DC motors, which can work with both AC and DC power sources.

Synchronous motor editing and broadcasting

Synchronous motor, like induction motor, is a commonly used AC motor. The characteristic is that during steady-state operation, there is a constant relationship between the rotor speed and the grid frequency, where n=ns=60f/p, and ns becomes the synchronous speed. If the frequency of the power grid remains constant, the speed of the synchronous motor in steady state remains constant regardless of the size of the load. Synchronous motors are divided into synchronous generators and synchronous motors. The AC machines in modern power plants are mainly synchronous motors.

working principle

Establishment of main magnetic field: The excitation winding is energized with DC excitation current to establish a polarity alternating excitation magnetic field, that is, to establish the main magnetic field.

Current carrying conductor: The three-phase symmetrical armature winding serves as the power winding and becomes the carrier of induced potential or induced current.

Cutting motion: The prime mover drives the rotor to rotate (inputting mechanical energy to the motor), and the excitation magnetic field with alternating polarities rotates along with the shaft and sequentially cuts the stator windings of each phase (equivalent to the reverse cutting of the excitation magnetic field by the conductors of the windings). [2]

Generation of alternating potential: Due to the relative cutting motion between the armature winding and the main magnetic field, a three-phase symmetrical alternating potential with periodic changes in magnitude and direction will be induced in the armature winding. AC power can be provided through the lead wire.

Intersectionality and symmetry: Due to the alternating polarity of the rotating magnetic field, the polarity of the induced potential alternates; Due to the symmetry of the armature winding, the three-phase symmetry of the induced potential is ensured. [2]

1、 AC synchronous motor

AC synchronous motor is a constant speed drive motor, whose rotor speed maintains a constant proportional relationship with the power frequency, and is widely used in electronic instruments, public equipment, textile machinery, etc.

2、 Permanent magnet synchronous motor

Permanent magnet synchronous motor belongs to asynchronous starting permanent magnet synchronous motor, and its magnetic field system consists of one or more permanent magnets, usually installed inside a cage rotor welded with cast aluminum or copper bars, with magnetic poles embedded with permanent magnets according to the required number of poles. The stator structure is similar to that of asynchronous motors.

When the stator winding is powered on, the motor starts running according to the principle of asynchronous motor and accelerates to synchronous speed. The synchronous electromagnetic torque generated by the rotor permanent magnetic field and the stator magnetic field (the electromagnetic torque generated by the rotor permanent magnetic field is combined with the reluctance torque generated by the stator magnetic field) pulls the rotor into synchronization, and the motor enters synchronous operation.

Reluctance synchronous motor, also known as reactive synchronous motor, is a synchronous motor that generates reluctance torque by utilizing the unequal reluctance of the rotor's orthogonal and direct axes. Its stator structure is similar to that of an asynchronous motor, but the rotor structure is different.

3、 Reluctance synchronous motor

Evolved from the same cage asynchronous motor, in order to generate asynchronous starting torque, the rotor is also equipped with cage type cast aluminum winding. There are reaction slots on the rotor corresponding to the number of stator poles (only the convex pole part functions, without excitation winding and magnets), used to generate magnetic reluctance synchronous torque. According to the different structures of the reaction slots on the rotor, it can be divided into inner reaction type rotor, outer reaction type rotor, and inner outer reaction type rotor. Among them, the outer reaction type rotor has a reaction slot with a ground rotor and an outer circle, so that the air gap in the vertical and horizontal directions is unequal. There are grooves inside the internal reaction rotor, which obstruct the magnetic flux in the cross axis direction and increase the magnetic resistance. The combination of internal and external reactive rotors combines the structural characteristics of the two types of rotors, with a significant difference between the straight axis and the orthogonal axis, resulting in a higher force and energy of the electric motor. Reluctance synchronous motors are also divided into various types such as single-phase capacitor operation, single-phase capacitor starting, single-phase dual value capacitor, etc.

4、 Hysteresis synchronous motor

Hysteresis synchronous motor is a synchronous motor that operates by generating hysteresis torque using hysteresis materials. It is divided into internal rotor hysteresis synchronous motor, external rotor hysteresis synchronous motor, and single-phase covered pole hysteresis synchronous motor.

The rotor structure of the internal rotor hysteresis synchronous motor is a hidden pole type, with a smooth cylindrical appearance. There is no winding on the rotor, but there is a ring-shaped effective layer made of hysteresis material on the outer circle of the iron core.

After the stator winding is connected to the power supply, the rotating magnetic field generated causes the hysteresis rotor to produce asynchronous torque and start rotating, and then it automatically pulls into synchronous operation. During asynchronous operation of the electric motor, the stator rotating magnetic field repeatedly magnetizes the rotor at a slip frequency; During synchronous operation, the hysteresis material on the rotor is magnetized, resulting in the appearance of permanent magnetic poles and the generation of synchronous torque. The soft starter uses three-phase anti parallel thyristors as voltage regulators, which are connected between the power supply and the motor stator. This type of circuit is like a three-phase fully controlled bridge rectifier circuit. When using a soft starter to start a motor, the output voltage of the thyristor gradually increases, and the motor gradually accelerates until the thyristor is fully conductive. The motor operates at its rated voltage mechanical characteristics, achieving smooth starting, reducing starting current, and avoiding overcurrent tripping during startup. When the motor reaches the rated speed, the starting process ends, and the soft starter automatically replaces the completed thyristor with a bypass contactor to provide the rated voltage for the normal operation of the motor, reducing the heat loss of the thyristor, extending the service life of the soft starter, improving its working efficiency, and avoiding harmonic pollution in the power grid. The soft starter also provides a soft stop function, which is the opposite of the soft start process. The voltage gradually decreases and the speed gradually drops to zero, avoiding torque shock caused by free parking.

Editing and broadcasting of deceleration motor

A reduction motor refers to an integrated body of a reducer and an electric motor (motor). This type of integrated body is commonly referred to as a gear motor or gear motor. Usually, it is integrated and assembled by a professional gearbox manufacturer before being supplied as a complete set. Deceleration motors are widely used in industries such as steel and machinery. The advantages of using a deceleration motor are simplified design and space saving.

1. The deceleration motor is manufactured in accordance with international technical requirements and has high technological content.

2. Space saving, reliable and durable, with high overload capacity and a power output of over 95KW.

3. Low energy consumption, excellent performance, and a gearbox efficiency of over 95%.

4. Low vibration, low noise, high energy saving, using high-quality section steel materials and steel casting

The iron casing and gear surface have undergone high-frequency heat treatment.

5. After precision machining to ensure positioning accuracy, the gear reduction motor of the gear transmission assembly is equipped with various types of motors, forming an electromechanical integration and ensuring the quality characteristics of product use.

6. The product adopts a series and modular design concept, with wide adaptability. This series of products has an extremely large number of motor combinations, installation positions, and structural schemes, and can choose any speed and various structural forms according to actual needs.

With a professional technical and business team, the company not only brings high-quality products to customers, but also provides automation engineering technology services and complete solutions.

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