Do JS series three-phase asynchronous motors belong to high-power-consuming motors?

The protected JS series three-phase asynchronous motors should be installed in indoor areas with an altitude of no more than 1000 meters, where the ambient air temperature is no higher than +40°C and no lower than 0°C, and where the air is clean and free from corrosive gases such as acids and alkalis. Electric motors must not be used in environments with explosive gases or a high level of dust. When the temperature of the air surrounding the motor exceeds the specified value or the air is dirty, ducted ventilation should be used. At this time, the temperature of the cooling air supplied to both ends of the motor should be between 0°C and +40°C, and it is necessary to ensure that the air pressure inside the pipes and the motor is higher than that of the surrounding air; where necessary, blowers, dust filters, etc. should be installed. The JS series squirrel-cage motors allow direct starting at full voltage. Y-series motors feature high efficiency, energy savings, high starting torque, excellent performance, low noise, minimal vibration, high reliability, and easy maintenance. Y-series motors are widely used; they can be applied in general environments free from flammable, explosive, or corrosive gases, as well as in machinery with no special requirements, such as various devices including metal cutting machines, water pumps, fans, transportation machinery, food processing equipment, and agricultural machinery.

Are JS series three-phase asynchronous motors **obsolete, energy-intensive motors?**

In simple terms, the working principle of a three-phase asynchronous motor is as follows: when symmetrical three-phase alternating current is supplied to the three-phase stator windings, a rotating magnetic field is generated, which rotates in a clockwise direction within the space between the stator and rotor at the synchronous speed n1. Since the rotating magnetic field rotates at a speed of n1, the rotor conductors are initially at rest; therefore, these conductors cut through the stator’s rotating magnetic field, generating an induced electromotive force (the direction of this induced electromotive force is determined by the right-hand rule). Since both ends of the slip conductor are shorted by the shorting ring, an induced current is generated in the rotor conductors under the action of the induced electromotive force, and this current flows in roughly the same direction as the induced electromotive force. The current-carrying conductors of the rotor are subjected to electromagnetic forces in the stator magnetic field (the direction of the force is determined by the left-hand rule). The electromagnetic force generates an electromagnetic torque on the rotor shaft, driving the rotor to rotate in the direction of the rotating magnetic field. Based on the above analysis, it can be concluded that the working principle of a motor is as follows: When three-phase alternating current is applied to the three stator windings of the motor (with each winding separated by 120 degrees in electrical angle), a rotating magnetic field is generated. This rotating magnetic field cuts across the rotor windings, thereby inducing an electric current in those windings (since the rotor windings form a closed circuit). The current-carrying rotor conductors experience an electromagnetic force due to this rotating magnetic field, which results in the generation of an electromagnetic torque on the motor’s shaft. This torque drives the motor to rotate, and the direction of rotation is the same as the direction of the rotating magnetic field.

The motor standard for the JS series, which has been replaced by the Y series, has been around for almost 30 years now – why are you still interested in the JS series?

Friend on the 5th floor, could you please provide detailed information on the motor standards regarding the replacement of the JS series by the Y series? Our factory still has one JS series motor in use! ! !

Reply to LZ: The JS series motors are designed in accordance with the motor standards of the former Soviet Union, and their features include durability and long service life. The Y series is developed in accordance with IEC standards; it is a set of standards that can be downloaded from the internet. You can use the old JS series motors from your factory with confidence, but you might consider using Y series motors as spare parts.