Squirrel Cage Three Phase Motor

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Title:

JS Low Voltage Squirrel Cage Three Phase Motor

Brief Introduction

Rotor type JS motor is a wire-wound squirrel cage three phase motor. The rotor winding is connected to an external varistor through a slip ring and a brush, which can improve the start-up performance or speed regulation by adjusting the resistance.Compared with the cage rotor, its structure is more complex but its control flexibility is higher. This series of motors meets industrial-grade protection standards.

Main Technical Parameters

Why choose Simo Brand JS series of Motor?

JS squirrel cage three phase motor is an AC motor, usually used to drive low-load mechanical equipment, such as fans, pumps, compressors, etc.The motor can adjust the speed by adjusting the voltage and frequency to adapt to different working loads.The power range of JS series motors is usually between 0.37KW and 315KW.

The deviation rate refers to the deviation of the motor shaft speed from the synchronous speed corresponding to the power supply frequency and pole logarithm. The rotor loss of the induction motor is proportional to the deviation rate. The deviation rate test equipment should be a ratio meter, that is, the motor speed and its power supply frequency are calculated at the same time during the time interval during the test.One example is the flash method. On the end face of the squirrel cage three phase motor shaft, draw the same number of fan-shaped pieces as the number of poles of the motor, and illuminate with fluorescent or neon lamps.

The power supply of the flash lamp should be the power supply of the motor under test.During the test, the number of rotations of the fan-shaped piece for a known period of time is calculated. The following method is based on the above principles, which can test the deviation rate very accurately and automatically transmit the test results to the data acquisition system. Figure C.1 Shows the principle of the test system, in which two pulse waves are generated: one pulse wave is directly generated by the output shaft of the induction motor under test; the other is associated with the frequency of the power supply.As shown in the figure, the motor under test and another low-power synchronous motor powered by the same power supply are connected to an axis angle encoder, which requires the two encoders to generate the same number of pulses per revolution.

The deviation of the reference synchronous motor can be regarded as zero. Two series of pulses are input to a two-channel digital counter, which requires the ability to calculate and display the ratio of the pulse frequencies of the two inputs. function. If an alternator is used as a power supply for testing and measuring induction motors, the second (reference) shaft encoder can be directly connected to the shaft of the generator.In addition, there is another method by which the phase-locked loop loop generates a reference pulse frequency by induction.

The value of the test voltage is according to Table 16 of GB/T 755-2008 or according to relevant product standards. The test should start from no more than half of the full value of the test voltage, and then gradually increase to the full value evenly or at no more than 5% of the full value at each step. The time for the voltage to increase from the half value to the full value should be not less than 10s.

The full-value test voltage value should comply with the provisions of Table 16 of GB/T 755-2008 and be maintained for 1 min. When mass production of 200kW (or kV. A) And below, when performing conventional tests on motors with rated voltage UN ≤1kV, the 1 min test can be replaced by a 1s test, but the test voltage value should be 120% of the specified value in Table 16 of GB/T 755-2008. 14.6 Determination of moment of inertia 14.6.1 Suspension rotor swing method 14.6.1.1 Single wire method The moment of inertia of the motor rotor was determined by the torsional swing comparison method of a single steel wire. 

Production Details

Frame

• Box structure frame, easy for maintaining and installation

• Flexible for special installation dimensions

• Customizable outlook and dimensions

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Stator

• 99.9% pure copper winding for stator to ensure the output power and efficiency

• Excellent insulation system with 5 more processing flows

• All the windings are fitted in by handwork to ensure all slots are full and avoid any possible winding flaw.

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Rotor

• Aluminum casting rotor with high quality silicon steel rotor core to assure induction efficiency

• Copper bar rotor is available for YKS motor

• Well and precisely machined shafts with good capacity of strength and toughness

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Testing

• All motors must pass the piece testing before painting and packaging

• Type tests will be regularly performed for each series, more often for new developed series and variants.

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Package and delivery

• All motors will be packaged well before delivery

• Plastic cover inside, vacuum tin foil outer and then solid wood box

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Applications

Simo JR motor can be used and perform well where heavy starting load is needed, speed adjusting when operating, insufficient power distribution capacity or the squirrel-cage rotor motor cannot be started smoothly. It can drive different machinery such as blowers, compressors, pumps, crushers, ball mills and other equipment in coalmines, machinery industry, power plants and various types of industrial and mining enterprises.  More application details, click here.

Cement

Power station

Mining

Water conservation

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