motor information-新利体育

actual drawing of positive and negative transfer line of three-phase asynchronous motor and detailed explanation of its functions

in order to enable the motor to rotate forward and reverse, two contactors km1 and km2 can be used to change the phase sequence of the three-phase power supply of the motor, but the two contactors cannot be pulled in. if they are pulled in at the same time, it will cause a short circuit accident of the power supply. in order to prevent this kind of accident, reliable interlocking shall be adopted in the circuit. the figure below shows the control circuit of motor running in both positive and negative directions with double interlocking of buttons and contactors. wiring diagram of three-phase asynchronous motor - actual diagram of positive and negative transfer lines:

influence of machining technology of motor parts on motor quality

in motor manufacturing, process fluctuation factors often have a great impact on the quality of the motor. on the one hand, it affects the operation performance of the motor, and on the other hand, it affects the assembly quality of the motor. the influence of motor manufacturing process on motor performance index is relatively complex. often, a motor performance index is related to several process fluctuation factors. different types of motors have different characteristics, which must be analyzed according to specific conditions.

how many starting methods are there for permanent magnet synchronous motor? what are the principles for selecting the startup mode?

1. when the grid capacity and load allow full voltage direct starting, full voltage direct starting can be considered. the utility model has the advantages of convenient operation and control, simple maintenance and high economy. it is mainly used to start small power motors. from the point of view of energy conservation, these methods are not suitable for the starting modes of five permanent magnet synchronous motors above 11 kw.

technical measures for improving the quality of cast aluminum rotor and reducing additional loss

in the squirrel cage three-phase asynchronous motor, the quality of the cast aluminum rotor directly determines the rotor loss of the motor. combined with some manufacturing design experience, for the cast copper rotor, the additional loss of the rotor is about 0.5% of the rated power, and the additional loss of the cast aluminum rotor accounts for about 1% to 3% of the rated power. therefore, under the current development trend of efficiency and energy saving, it is necessary to control the additional loss of the rotor, some technological measures are taken to reduce the additional loss of the motor.

magnetization requirements and design method of permanent magnet motor

permanent magnet motor is a kind of motor that uses permanent magnet to establish magnetic field. it is also a common motor. after being made, permanent magnet motor can maintain its magnetic field without external energy. so what are the magnetization requirements and design methods of permanent magnet motor? let's learn together!

test method for energy efficiency of permanent magnet synchronous motor

efficiency is the ratio of output power to input power expressed in the same unit, usually expressed as a percentage. the output power is equal to the input power minus the total loss. if two of the three variables (input, total loss or output) are known, the efficiency can be calculated with the following formula 1 or 2:

how to improve the working efficiency of permanent magnet motor

for customers who want to buy permanent magnet motor, they pay more attention to these problems. one is the characteristics of permanent magnet motor, and the other is its working efficiency. we have introduced the characteristics of this motor before, so how to improve the working efficiency of permanent magnet motor? let's learn together! the main factors affecting the working efficiency of permanent magnet motor can be divided into mechanical loss and electromagnetic loss. in order to effectively improve the working efficiency of permanent magnet motor, we must start from the following influencing factors.

discussion on insulation treatment technology of motor (part 2)

when the motor is in use, it starts frequently and has high no-load speed. sudden load jamming and even locked rotor often occur. sometimes the instantaneous temperature of the motor used in special occasions can reach more than 200 ℃, and at the same time, it will cause severe vibration. this kind of high centrifugal force, severe vibration and instantaneous thermal shock generated at high temperature and high speed puts forward requirements for the insulation structure of the motor to be resistant to vibration, cold and thermal shock and high temperature, so as to ensure the normal operation of the motor.

will other performances of high-efficiency motor decrease while improving efficiency?

for the high-efficiency motor, a fan asked a question: in the process of improving the efficiency of the motor, whether it will have an adverse impact on its power factor and other performance.gb18613. gb30253 and gb30254 are motor energy efficiency restrictions for different series of products, and they are only special regulations for the efficiency of corresponding products. the technical conditions corresponding to the product will not conflict, but in terms of motor efficiency index, the efficiency index specified in

how can users identify whether the motor is a high-efficiency motor?

in order to better guide consumers to use high-efficiency motors, china adopts energy efficiency identification management for basic series motors, which should be filed on china's energy efficiency identification network and pasted with corresponding energy efficiency identification on the motor body.

discussion on insulation treatment technology of motor (part i)

although the coil and other parts of the motor have certain insulation ability when they are made into stator and rotor, for example, the enameled wire is insulated by paint film as conductor; there is slot insulation in the iron core slot. however, the thin layer of paint film on the enamelled wire is very weak and vulnerable as the conductor insulation, and the enamelled wire, slot insulation and slot wedge move with each other. when the motor starts and stops, the insulating material shall withstand the impact of electromagnetic vibration and mechanical vibration, as well as the erosion of moisture,

discussion on single phase asynchronous motor

why do some single-phase motors have two capacitors while others have only one? a motor with two capacitors, one is the starting capacitor and the other is the running capacitor. the starting capacitor is connected to the centrifugal switch. at present, there are three main categories of single-phase asynchronous motors: the first category is the single capacitor phase-shifting type without centrifugal switch, such as electric fans, which are usually used on small motors.

cause analysis and preventive measures of phase failure operation of three-phase asynchronous motor

the three-phase asynchronous motor often burns out when it runs out of phase. the main reason is that the reverse sequence magnetic field produces large braking torque after one-phase power failure, which reduces the output torque of the motor. when the external load remains unchanged, the slip rate increases, and the current in the stator winding is much higher than that in normal operation, resulting in increased copper and iron consumption, resulting in the increase of motor temperature and burning out the stator winding.

maintenance and management measures of three-phase asynchronous motor in storage

the storage conditions of the motor shall be selected according to its protection grade and the characteristics of the suitable equipment to ensure that the installation size and the quality characteristics of the motor will not deteriorate during the storage of the motor.

on the control mode of three-phase asynchronous motor

control mode of three-phase asynchronous motor:1. direct start - the method is simple, the cost is low, and most motors with small capacity are started directly.2. step down starting of self coupling transformer - the advantage is that it can be directly controlled manually or automatically controlled by ac contactor. it is durable and low maintenance cost. it is suitable for all no-load and light load starting asynchronous motors.

what is the slip of three-phase asynchronous motor?

what is the slip of three-phase asynchronous motor? the driving torque exists only when the closing coil has induced current. the torque is determined by the current of the closed coil and exists only when the magnetic flux in the ring changes. at this time, there must be a speed difference between the closed coil and the rotating magnetic field.

what are the causes of overload of three-phase asynchronous motor?

although the operation of three-phase asynchronous motor is generally stable and the accident rate is small, it does not mean that there is no fault. if the load it drives exceeds the rated power of the motor, the motor will be overloaded.

what is the method to reduce the vibration of three-phase asynchronous motor?

the vibration of asynchronous motor is the focus of motor structure design at present. it is composed of electromagnetic vibration, mechanical vibration and gas vibration. electromagnetic vibration: the interaction of the magnetic field in the air gap of the motor generates electromagnetic force varying with time and space on the rotor and stator, causing the motor to vibrate.

what are the advantages of permanent magnet synchronous motor compared with ac asynchronous motor?

permanent magnet synchronous motor and ac asynchronous motor are often heard in the power system, and permanent magnet synchronous motor accounts for the vast majority in frequency. what are the differences between them, and what are their advantages and disadvantages?

understand variable frequency motor in one minute -- a brief description of the characteristics and advantages of variable frequency motor

how to distinguish between variable frequency motor and ordinary motor?

do you know how the variable frequency motor works? principle of variable frequency motor

high efficiency motor is the key element of real "high efficiency", which must be mastered

connection and difference between high efficiency motor and ordinary motor

why is it not recommended that ordinary motors use frequency converters for speed regulation?