The meaning of domestic small and medium-sized three-phase motor model

Domestic middle and small types of series of Y series three-phase motor, is according to the international electrotechnical commission IEC standard design and production of three-phase asynchronous motor, which is based on motor center height model spectrum, such as Y - 200 l2 - 6 • • Medium and small three-phase asynchronous motor frame number with the stator iron core diameter and the relationship between the center height are shown in table 1 and table 2. Table 1 small asynchronous table 2 medium asynchronous three-phase motor in the three-phase motor, small number of three-phase asynchronous motor frame and stator core diameter and the relationship between the center height as shown in table 1 and table 2. Rated output rated power refers to the full run-time three-phase motor shaft output mechanical power rating, said to kw ( 千瓦) Or tile ( W) As the unit. Rated voltage of rated voltage refers to the line voltage to the motor windings, represented by the UN. Three-phase motor requires that changes the voltage value of general should not exceed the rated voltage of plus or minus 5%. High voltage motor is easy to burn; Voltage is too low, it is hard to start motor, even after the start motor may also take the fixed load, easy to burn out. Rated current rated current is refers to the three phase motor under the rated supply voltage, output power rating, into the line current of stator winding, used IN, said to Ann ( 一) As the unit. If more than rated current overload operation, three-phase motor overheating and burning. Three-phase asynchronous motor rated power and rated other data has the following relationship between type of - — The rated power factor - — Rated frequency, rated frequency is refers to the motor of ac power by the number of cycles per second, with fN said. Provisions in China standard power frequency 50 hz. Rated speed rated speed said in three-phase motor rated running speed per minute, when expressed in nN, usually slightly smaller than the corresponding synchronous speed n1. If the n1 = 1 500 r/min, nN = 1 440 r/min. Insulation class insulation class is adopted by the three-phase motor insulation heat resistant ability, it shows that allows the highest working temperature of three-phase motor. Three-phase motor insulation class and the maximum allowable temperature see table 8. 1. Fixed norm refers to the running condition of three-phase motor, which allows continuous use time, continuous, short, intermittent cycle is divided into three. 1) Continuous working status refers to the continuous operation of the motor with rated load, running for a long time, the temperature of the motor can achieve steady state temperature rise of the workings of a 2) Short-time working state in a short time is refers to the operation of the motor with rated load, running time is short, make the temperature of the motor can not reach the steady state temperature rise; Down time is very long, can make the temperature of the motor down to zero way of working. ( 3) Intermittent cycle of intermittent cycle working status refers to the operation of the motor with rated load, running time is short, make the temperature of the motor can not reach the steady state temperature rise; Stop time is very short, bring down the temperature of the motor is less than zero, the cycle time is less than 10 min way of working. Connection of the three-phase motor stator winding connection methods have star ( Y） And the triangle ( Delta) Two kinds. Stator winding connection method connected by the regulation, only can change any connection, otherwise it will damage the three-phase motor. Protection grade protective said three-phase motor shell protection grade, which is the IP protection grade mark symbol, followed by two digits of the axial-flow compressor. in order respectively electricity solid and waterproof ability. The greater the number, the stronger the protection capability, such as IP44 first number '4' in the said motor can prevent the diameter or thickness is greater than 1 mm inner solid into the motor. The second number '4' said can carry water splashing in any direction.