The basic conditions for the formation of current are voltage and closed circuit. The prerequisite for generating shaft current is the presence of shaft voltage and a closed circuit.

The marine crane motor of new equipment or equipment that has been disassembled and inspected should first undergo an empty vehicle trial run with several revolutions. But before the equipment is finished, do not turn on the power for trial operation. In application, it is definitely prohibited to use in environments that are not allowed, and to exceed the additional load and the additional closing frequency per hour (120 times).

For variable frequency motors, starting is a very easy task, while for asynchronous motors, starting is always a crucial performance indicator. In the performance parameter indicators of asynchronous motors, starting torque and starting current are important indicators reflecting the starting

A netizen mentioned that the winding of his single-phase motor overheated and was burned out. He plans to the number of turns in the main winding and asks whether the number of turns in the auxiliary winding needs to be adjusted.

It is really difficult to learn from a normal YE3 motor. If you learn from the analysis process of a faulty YE3 motor, it is really a shortcut and will involve every possible link. Today we share a case of scanning chamber failure. From this case, we can find some unsuitability of YE3 motor processing technology and operation process.

Marine motor products are machines that convert electrical energy into mechanical energy. Directly related includes the selection of bearings for marine motors. The bearing capacity of the bearing must match the power and torque of the marine motor, and the size of the bearing must match the physical space of the relevant components of the marine motor.

Starter bearings (commonly known as copper sleeves) often have loose necks and copper sleeves due to excessive wear during normal use, ultimately affecting the performance of the starter

In many marine motor applications, the marine motor is required to operate in dual-voltage mode, that is, the same marine motor can operate normally at different rated voltages, such as common 380/660V, 6/10kV dual-voltage marine motors.

YE3 motors of the same power can have different voltage levels; Such as 220V, 380V, 400V, 420V, 440V, 660V, 690V in low-voltage motors, of which 380V is the standard voltage of low-voltage three-phase power supply in China; High voltage motors have voltage levels of 3000V, 6000V, and 10000V. When selecting a YE3 motor, users should match it reasonably with the power supply voltage of the actual usage location.

For relatively high-end equipment, use necessary protective devices. When the power supply voltage is abnormal, cut off the power supply for protection. For very precise instruments, use a constant voltage power supply for adjustment. For energy-saving motor products, especially industrial energy-saving motor products, the possibility of using constant voltage devices is very small, and there are more situations of power-off protection.

Is the constant torque low-frequency adjustable? The answer is affirmative. All frequency converters basically have the function of adjusting the torque of marine motors, that is, adjusting the output torque of marine motors based on the setting of the power supply voltage and frequency ratio. This is a very practical problem in the application of variable frequency motors.

With the rapid development of power electronics technology and new semiconductor devices, AC speed regulation technology has been continuously improved and enhanced. The gradually improved frequency converter has been widely used in AC motors due to its good output waveform and excellent cost-effectiveness.

Shaft current is the main quality killer of variable frequency motors, large motors, high-voltage motors, and generators, which can cause significant damage to energy-saving motor bearing systems.

The stator and rotor of YS-H series marine three-phase asynchronous motors are supported by bearings to ensure that they have a relatively reasonable positional relationship in both static and operational states.

Ground insulation refers to the relative insulation state between the energized conductor of YE3 motor winding and other components to ensure that current flows along the designed path.

Corona is a common electrical fault phenomenon in high-voltage motors and variable frequency motors. Especially for high-voltage motors, when the rated voltage of YE3 motor is not less than 6kV, there are more occurrences of corona during the operation of YE3 motor. Especially in high-altitude, humid or corrosive gas environments, the corona voltage will decrease.

In marine environments, marine diesel generator sets face severe corrosion challenges. Salt content, humidity, and temperature changes in seawater can all cause corrosion of metal components, thereby affecting the performance and lifespan of power generation units. Shandong Ruihan will explore the corrosion issue of marine diesel generator sets and propose corresponding protective strategies.

Marine generator sets generally adopt quasi synchronous juxtaposition. Assuming it is quasi periodic, in addition to the same phase sequence, it should also satisfy the same frequency and voltage of two generators, with fundamentally the same phase difference, and can be connected to the power grid.

Compared with wound rotor motors, cage rotor motors are more widely used. Cage rotor motors have irreplaceable advantages in both production and maintenance aspects. Its main advantage is the degree of freedom in selecting rotor slots for energy-saving motors.