Standard for motor standards

The motor manufacturer in accordance with national standards, according to the motor design and test data provided by the normal operation of each motor and conditions, known as the motor rated operation. Representation of the motor rated operation of the various values, such as voltage, current, power, etc. called the motor rated.

(01) model, which indicates the product performance, structure and use of the code.

(02) rated power. In the case of rated operation (refer to voltage, frequency and current are rated), the mechanical power output on the motor shaft is the rated power of the motor.

(03) rated voltage. The line voltage of the motor in rated operation is the rated voltage of the motor. It is generally specified that the motor voltage should not be 5% above or below the rated value. If the three-phase stator winding can have two connections, it is marked with two corresponding rated voltage. (If the voltage is higher than the rated value, the excitation current will increase, the iron loss will increase, the winding has overheating phenomenon.When the voltage is lower than the rated value, when the motor is fully loaded, it will cause the speed to decrease, the current increases, . When the voltage is low, the maximum torque of the motor will be significantly reduced).

(04) rated current. Refers to the motor in the rated voltage, rated frequency and rated load operation, the three-phase stator winding through the line current, in units of A. As the stator winding connection in different ways, the rated voltage is different, the motor rated current is also different. For example, a rated power of 10kW three-phase asynchronous motor, the winding for triangular connection, the rated voltage of 220V, rated current of 68A; winding for star connection, the rated voltage of 380V, rated current of 39A. In other words, the nameplate marked: connection method - triangle / star; rated voltage - 220 / 380V; rated current - 68 / 39A.

(05) rated frequency. Refers to the frequency of the AC power supply received by the motor, the frequency of the alternating current produced by the power plant in China is 50Hz.The frequency decreases and the stator current increases.

(06) rated speed. Refers to the motor in the rated voltage, rated frequency and rated load operation, the rotor per minute revolution, the unit r / min. Its value is slightly lower than the synchronous speed.

(07) connection. Refers to the motor in the rated voltage under the stator winding wiring. There are two types of star and triangular connections: star connection, the winding can withstand the voltage is triangular wiring 1 / √3, it must be specified by the nameplate wiring wiring. Otherwise the motor will burn.

(08) insulation class. According to the insulation used in the winding material, according to its level of permissible heat tolerance. Small and medium-sized asynchronous motor insulation class A, E, B, F and H level. The operating temperature of the motor is mainly limited by the insulating material. If the operating temperature exceeds the permissible temperature of the insulating material, the insulating material will rapidly deteriorate and its service life will be greatly reduced. When repairing the motor, the insulating material used should meet the insulation rating specified on the nameplate.

(09) temperature rise. Refers to the long-term continuous operation of the motor operating temperature than the ambient temperature higher than the value. China provides the maximum ambient temperature of 40 ℃. For example, if the allowable temperature rise of the motor is 65 ° C, the permissible operating temperature is 65 ° 40 = 105 ° C. The permissible temperature rise of the motor is related to the level of insulation used. The temperature rise in the operation of the motor has great influence on the service life of the insulating material. The theoretical analysis shows that the temperature of the insulating material in the motor is 8% higher than the rated temperature, and its service life will be shortened by half.

(10) work quota. Refers to the way the motor works, that is, under the specified working conditions to run the duration or work cycle. Motor running, according to the heat conditions can be divided into three basic modes of operation: continuous operation, short-term operation and intermittent operation; continuous operation --- according to the specified power on the nameplate long-term operation, such as pumps, fans and machine equipment The motor is used in a continuous mode of operation. Short-term operation - Run at rated power for only a specified amount of time each time, and there should be sufficient cooling time to meet the requirements before starting again. The motor is operated in a batch mode, such as cranes and cranes, which are intermittent.

(11) rated power factor. Refers to the motor in the rated output power, the stator winding phase voltage and phase current phase angle between the cosine, about 0.70 ~ 0.90. When the motor is running without load, the power factor is about 0.2. The higher the power factor, the higher the utilization rate of the power distribution equipment.

(12) rated efficiency. For the motor, the input power and output power range, the difference is equal to the power loss of the motor itself, including copper loss, iron loss and mechanical loss. Efficiency is the ratio of the output power to the input power, that is, usually about (75 to 92)%. The higher the efficiency, the smaller the loss of the motor (13) the rotor voltage. Winding-type asynchronous motor stator winding with a rated voltage, the rotor does not rotate when the voltage between the two slip ring.

(14) rotor current. Winding Asynchronous Motors Use Rotor Current at Rated Power.

(15) starting current. Refers to the motor at the moment of the start of the current, commonly used with the ratio of the rated current to represent a multiple. Asynchronous motor starting current is generally 4-7 times the rated current.

(16) Starting torque. The starting torque is the output torque at the time of starting the motor, which is often expressed as a multiple of the ratio of the rated torque. Typically 1-1.8 times the rated torque.

(17) by weight. Refers to the weight of the motor itself, for lifting handling reference.

Abstract: This paper introduces the development and improvement of the energy efficiency standard of the major countries and regions in the world. Mainly in the United States, the European Union, Oceania and the development of relevant standards in China, for example, compared the different regions of the motor energy efficiency standards in the implementation of the implementation of the scope and implementation of the differences. And pointed out that the development of energy efficiency standards at night to promote efficient R & D and promotion of motor is of great significance.