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Compared with wound rotors, cage rotors have relatively better quality and safety, but cage rotors will also have quality problems in situations with frequent starting and large rotational inertia.

In order to better guide consumers to use high-efficiency motors, our country adopts energy efficiency label management for basic series motors. Such motors should be registered on the China Energy Efficiency Label Network and the corresponding energy efficiency logo should be affixed to the motor body.
Taking the more commonly used YE2, YE3, YE4 and YE5 motors as an example, the same energy efficiency may not be an energy-saving motor in different periods. To determine whether the motor is an energy-saving motor, it must correspond to the GB18613 standard valid at the time. The energy efficiency of the motor is divided into 3 levels, level 1 is the highest level, and level 3 is the energy efficiency requirement that the motor must meet, that is, the minimum limit value requirement, that is, the efficiency level of this type of motor is not lower than the limit value requirement before it can enter the market for sale.

Motor bearing noise has always been a problem that troubles many engineers. As mentioned in the previous article, the noise of motor bearings cannot be described in words, so it often brings trouble to motor technicians in judging.
However, after a long period of on-site practice, coupled with the mastery and analysis of motor bearing knowledge, many useful on-site judgment criteria will be obtained. For example, what kind of "noise" is the "normal noise" of the bearing.

Compared with asynchronous motors, permanent magnet synchronous motors have obvious advantages. They have high efficiency, high power factor, good performance indicators, small size, light weight, low temperature rise, significant technical effects, 

For motor products, on the one hand, customers should be made aware of the maintenance and care items during the operation of the motor through appropriate means; on the other hand, experience and common sense should be accumulated continuously.

Business import:
In the UAE, companies need to meet the following conditions to import goods:
1. Company registration: First, the company must register with the UAE Business Registry and obtain a valid business license.
2. Customs registration: Then, the company needs to register with the UAE Federal Customs Authority (FCA) and obtain a customs import code,
3. Relevant licenses: For certain types of goods (for example, food, medicine, cosmetics, etc.), approval or permission from relevant government departments must be obtained before

Types and characteristics of couplings

1. Rigid couplings:
•Features: No displacement between the shafts is allowed, suitable for situations where the two shafts have good alignment.
•Types: including sleeve couplings, clamp couplings, flange couplings, etc.

Shaft current is a common and unavoidable problem for high-voltage motors and variable-frequency motors. Shaft current can cause great damage to the bearing system of the motor. For this reason, many motor manufacturers will use insulating bearing systems or bypass measures to avoid shaft current problems.

Thin bars or broken bars are commonly used fault terms in cast aluminum rotor motors. Both thin bars and broken bars refer to the rotor bars. Theoretically, once the rotor's punching slot shape, iron length, and slot slope are determined, the rotor bars are outlined in a very regular shape. However, in the actual manufacturing process, various reasons often cause the final rotor bars to be twisted and deformed, and even shrinkage holes appear inside the bars. In severe cases, the bars may break.