Help: Motor selection

Based on the explosion protection principles, explosion-proof motors can be classified into flameproof motors, increased safety motors, positive pressure motors, spark-free motors, and dust explosion-proof motors, among others. 1. Flame-proof motor: It uses a flame-proof enclosure to separate the electrical components that may generate sparks, arcs, and dangerous temperatures from the surrounding explosive gas mixture. However, this casing is not sealed, and the explosive gas mixture in the surroundings can enter the motor through the gaps at the joints of its various parts. An explosion may occur when it comes into contact with ignition sources such as sparks, arcs, or dangerous high temperatures inside the enclosure. In such cases, the motor’s flame-retardant enclosure will not be damaged or deformed, and even when explosive flames or hot gases escape through the gaps in the joints, they will not be able to ignite the surrounding explosive gas mixture. Its main features are: (1) The correspondence between power ratings, installation dimensions, and rotational speed is in line with DIN42673; meanwhile, necessary adjustments have been made to take into account compatibility with the YB series as well as interchangeability with the Y2 series, making it more effective and suitable. (2) The entire series uses Class F insulation, with temperature rise evaluated according to Class B standards. (3) The noise limit is lower than that of the YB series, approaching the Class I noise level of the YB series, while the vibration limit is comparable to that of the YB series. (4) The enclosure protection rating has been increased to IP55. (5) The entire series uses low-noise deep-groove ball bearings, and motors with a frame center height of 180 mm or more are equipped with oil injection and drainage devices. (6) The motor radiators come in two types: parallel horizontal distribution and radial distribution, with the parallel horizontal distribution being the most common. (7) The main performance indicators have reached the international advanced level of the early 1990s. 2. A increased-safety motor is a motor design that does not generate arcs, sparks, or dangerous high temperatures under normal operating conditions; additional mechanical, electrical, and thermal protection measures are then implemented to further prevent the occurrence of arcs, sparks, or high temperatures under normal or permitted overload conditions, thereby ensuring its explosion-proof safety. Its main features are: (1) it meets the requirements of increased-safety explosion-proof motors, employing a range of reliable measures to prevent sparks, arcs, and dangerous high temperatures, allowing it to operate safely in Zone 2 areas with explosion hazards. (2) Brushless excitation is used, with a rotating rectifier disc and a static excitation cabinet installed, ensuring reliability of the excitation control system ； Polarity-conforming slip excitation is accurate, with no shocks ； The excitation system features reliable out-of-step protection and strong re-synchronization capability ； The circuit design is reasonable, and the discharge resistor does not generate heat during operation ； The excitation current has a wide adjustment range. (3) The synchronous machine, AC exciter, and rotating rectifier disc are coaxial. The rectifier disc is located between the main motor and the exciter, or outside the bearing housing. (4) The enclosure protection rating is IP54. (5) Class F insulation is used, with the temperature rise evaluated according to Class B standards. (6) Change from traditional bottom water cooling to top water cooling, that is, the water cooler is placed above the motor. (7) A safety-enhanced moisture-proof heater is installed in the cover at the bottom of the motor, to be used for heating and preventing moisture accumulation when the machine is shut down. (8) High-quality raw materials are selected, with ample margins in electrical and mechanical calculations to ensure operational reliability and meet the temperature requirements of enhanced-safety motors. (9) Comprehensive monitoring measures are in place ； An intrinsically safe self-balancing current transformer for differential protection is installed in the main junction box ； Stator winding embedding work and spare platinum resistance thermometers, with a calibration grade of Pt100 ； Install a leak detector to monitor leaks in the water cooler ； The seated sliding bearings at both ends are equipped with on-site temperature display instruments and remote signal terminals respectively

Flameproof motor. . . . . . . . . . .

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