December 12, 2019

Brushless and acyclic variable resistance starter

First, product introduction and characteristics
JR, JZR, YR, YZR, three-phase wound rotor AC asynchronous motor (also known as slip ring motor). Since external resistor or reactance, having a higher power factor and a larger starting torque in starting on its rotor, thus, in the metallurgical, mechanical, chemical, mining, building materials and other fields such motors are commonly used To drag the device. Because the motor shaft is equipped with slip ring, carbon brush, short circuit ring and other components, they form a complete secondary circuit system with the electrical components such as relays, AC contactors and frequency sensitive varistor in the control box, as the starting and starting of the motor. Running shorting device. This working mode of the motor has the following disadvantages: 1. The carbon brush is easy to wear, the consumption is too high, the maintenance amount is large, and the normal production is affected. 2, sparks are easily generated between the carbon brush and the slip ring, and some places cannot be used. 3. The friction between the carbon brush and the ankle ring increases the contact resistance and the motor temperature rises. 4. Conductive powder is easily sucked into the motor and is a hidden danger of burning the motor. 5. The time relay is out of control and it is easy to burn the AC contactor and the frequency sensitive varistor, resulting in shutdown and production stoppage. The brushless and acyclic variable resistance starter just overcomes the shortcomings. It eliminates the slip ring, carbon brush and secondary circuit system, does not need spare parts, reduces the maintenance amount, ensures the safe operation of the motor, and has the advantages of one installation and long-term benefit. It is the leading equipment in the domestic leading position.
Second, the working principle
The brushless and acyclic variable resistance starter is an evolution of the working mode of the BP4 type frequency varistor. It adopts the best magnetic circuit principle and the best magnetic conductive material to make the electromagnetic circuit composed of the multi-contact elements of the original secondary circuit system through the process. The innovation is made into a non-contact electromagnetic component as a starting device for variable resistance at start-up. It utilizes the relationship that the rotor current frequency decreases with the increase of the rotor speed during the starting process, that is, the rotor speed changes from 0 to the rated speed Ne, and the frequency of the rotor current is smoothly reduced from 50 Hz to l??2 Hz. The starter impedance is changed from maximum to minimum, equivalent to the external resistance of the rotor circuit from maximum to minimum, so it can be automatically adjusted with the change of the rotor frequency, which is an ideal starting device.
Third, the scope of use and technical parameters
JR, JZR, YR, YZR three-phase wound rotor AC asynchronous motor (except for variable speed) using BP1 frequency sensitive, BP4 frequency varistor and resistance box start, can use brushless and acyclic variable resistance starter The replacement is updated and the operating characteristics are unchanged after replacement. Its equipped motor capacity is best between 380V/ll--280Kw; 3KV, 6KV/200 560Kw. Dragging equipment such as: ball mill , fan, air compressor, water pump, conveyor, rubber mixer, driving claw bucket, hoist, oxygen generator, rolling mill, etc. No need to remember positive and negative, occasionally with more frequent start, you can use brushless and acyclic variable resistance starter. l, light load start: Mst>=0.6 0.8Me, Ist<=3 3.5Ie, Tst<=6S. 2. Heavy-duty starting: MSt>=1.6 2.0Me, Ist<=3.5 4Ie, Tst<=9S. The above technical parameters are theoretical calculation values ​​for reference. [next]
Fourth, installation instructions
The brushless and acyclic variable resistance starter is mounted on the motor shaft (the position where the slip ring is installed) and rotates at the same time as the rotor, and the structure is relatively compact. It consists of a yoke plate, coil winding, terminal, internal and external iron core, bushings and other parts form a whole, with a denier easy installation and removal, without spare parts and less maintenance. The long-term benefit of an installation is very popular among users. 1. Remove the protective cover of the motor, short-circuit ring, carbon brush, slip ring, brush box, brush holder and other vulnerable parts. 2. When disassembling the slip ring, be sure to pay attention to the phase sequence (AA, BB, CC) of the six outlets of the rotor. If there is no obvious mark, the two heads of the same phase are bundled together to prevent the wiring from being wrong. (The motor below 50Kw has only three outgoing lines, no need to mark). 3. In the control cabinet, if there is an interlocking device between the rotor circuit system and the stator circuit system, the chain should be released. 4. The current value of the air switch and other overcurrent protection devices in the control cabinet should not be less than 3.5 to 4 times the rated current of the motor stator. 5. Check the insulation resistance of the motor rotor and starter with a 500 volt megohmmeter, which cannot be lower than lMΩ. 6. Use the vernier caliper to check whether the shaft diameter, key width and key height of the motor are consistent with the size of the starter bushing. If there is any difference, it cannot be installed. Tolerance dimensions are properly matched according to the principle of transitional coordination. If it is too tight, it should be treated accordingly. 7, coated with a little oil in the inner bushing or bearing grease, the keyway on the bushing starter motor shaft position of the alignment key, and then the boss position against a steel pipe or copper bar, and dried to a mounting position under the hammer . 8. The starter has one end of the terminal and the motor head line is in one direction. Do not make mistakes during assembly.
Fifth, the connection between the starter and the rotor
l. The 12 heads of the six sets of coils of the starter have been fixedly connected inside, leaving only six terminals to be connected as the rotor head line. 2. There are two types of motor rotors: the large-capacity motor has six outgoing lines, so don't make mistakes when connecting. The small-capacity motor has only three outgoing lines. 3. Connection scheme: (1) Same connection, that is, the three pairs of AA, BB and CC are connected to the starter 1.4; 2.5: 3.6 terminal, the terminal has no fixed order, any one starts, numbered clockwise Just fine. (2) Delta connection: Connect the three lead wires of the motor to the l.3.5 terminal of the starter. (3) Special connection: Only three of the starter terminals are connected to the motor rotor wire, then AA should be pressed on one terminal, BB on the second terminal, and CC on the third terminal. 4. Since the starter is a non-contact electrical component, the spring washer must be pressed on the terminal when wiring. 5. After the installation work is completed, check the insulation of the starter and rotor to the ground. 6. The starter is mounted on the shaft, and the key and the snap ring on the original shaft are still used to prevent the radial and axial movement of the starter on the shaft, which is indispensable. 7. Since the starter has replaced the secondary circuit system connected to the original rotor, the secondary circuit system does not work, and the time relay power supply line can be cut off, and the original secondary circuit system no longer operates. [next]
Sixth, test drive
l After the installation is completed, the user should conduct a comprehensive inspection of the starter, the entire transmission equipment, and the control box. If there is no grounding, (with the 500V megohmmeter after the assembly, the insulation is not less than 1MΩ), the contact is poor, etc. It can be started. 2. If the start trip is found, the overcurrent protection can be adjusted to a larger point, or the extension time can be lengthened. 3. Due to different motor parameters, after installing the product, the running current is within the range of ±3% compared with the original working mode. 4. Since the starter does not need to be cut off and participates in the rotor operation, there is a slight temperature normal phenomenon, and the temperature rise is the same as the motor B-class insulation temperature rise standard. If the temperature rise is too high, stop the machine to check the cause, whether the phase sequence is connected incorrectly (the AC voltage regulator and the multimeter AC voltage file can be used to detect the phase sequence), or the crimping is poor. 5. If the machine is shut down for a long time, the insulation resistance to ground must be checked before starting, at least not less than 1MΩ.
Seven, starter removal and maintenance
(1) When the user needs to refuel or overhaul the motor, the starter must be removed. There are two methods: 1. Use a steel pipe smaller than the motor shaft as a support column, use it to hold the motor shaft, and then use a three-jaw (also known as a puller) of appropriate size to construct the yoke plate at the opposite coil to start. The device is pulled down from the motor shaft. 2. After the support column is used, the car jack can also be used to pull the starter bushing from the shaft. Do not damage the starter, and do not deform the starter, otherwise it will affect the performance. (2) The starter should be inspected and maintained normally. 1. The six external terminals and the six wires of the rotor must be firmly pressed with the elastic pad. If it is loose, it should be tightened. It is best to check whether it is loose once a month. 2. The starter's six money loops are connected to each other and have been compacted at the factory. However, if it is operated for a long time, it may loosen. It should be checked once every six months for looseness. If it is loose, the six terminals of the rotor can be disassembled first, then the plum blossoms are used. Glove the nut inside the binding post or a tool such as a knife against the notch of the screw head, and then tighten the nut of the fastening post from the outside with the hand. Be careful not to damage the line package. 3, the starter generally does not need to be dismantled, because the factory debugging to the best place. If the six coils are loose and the yoke plate must be removed to press the inner six terminals, you can make the marks one by one and press the original position in the original position. Check if it is restored, and observe whether the inner iron core is just tightly attached during assembly.

Light Tower is normally used for night lighting in municipal,highway bridges,ports,mines,construction sector construction and other fields, and also suitbable for night repair and disaster scene.

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Vibratory Road Roller Laser Screed , Power Trowel , Road Repair Machine, Road Marking Machine.

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Jining Furuide Machinery Manufacturing Co., Ltd. , https://www.furdroller.com