Elektror motor Germany Elektror model Elektror price

Elektror motor is a type of motor that can be used in flammable and explosive environments, producing no electrical sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and natural gas, petrochemicals, and the chemical industry. In addition, they are widely used in textiles, metallurgy, urban gas, transportation, grain and oil processing, papermaking, pharmaceuticals, and other sectors. As primary power equipment, explosion-proof motors are typically used to drive pumps, fans, compressors, and other transmission machinery.

Elektror motor development trends

The successful development of heat-resistant, high magnetic performance neodymium iron boron permanent magnet materials in motor materials will enable their important application in high-power permanent magnet synchronous motors. The demand for high-power motors is growing in transportation and industry, such as electric vehicles, hybrid (internal combustion engine and motor combined) power vehicles, trains, elevators, machine tools, and robots. Marine propulsion motors require low speed and high torque. Traditional motors are difficult to use in special occasions such as high temperature, high vacuum, or confined spaces, while rare earth permanent magnet motors can withstand high temperatures (referring to samarium cobalt or high heat-resistant neodymium iron boron magnets) and have a small volume, precisely meeting these special requirements. Motors working in special environments, such as manipulators in aerospace equipment, inspection robots in nuclear energy equipment, and semiconductor manufacturing devices, require high-temperature motors and high-vacuum motors. Developed three-phase four-pole permanent magnet motors include 150W and 3000r/min, operating in high temperatures of 200℃ to 300℃ and a vacuum level of 133.3×10-6Pa, with a diameter of 105mm and length of 145mm, using Sm2Co17 permanent magnets with good high-temperature characteristics.

Elektror motor control principle

Motor control principle: to make the motor rotate, the control unit must first determine the rotor position sensed by the hall-sensor, and then decide the sequence for turning on (or off) the power transistors in the inverter based on the stator winding. The AH, BH, CH (these are called upper arm power transistors) and AL, BL, CL (these are called lower arm power transistors) in the inverter cause current to flow through the motor coils in sequence, generating a forward (or reverse) rotating magnetic field, which interacts with the rotor magnets, thereby enabling the motor to rotate clockwise/counter-clockwise. When the motor rotor rotates to a position where the hall-sensor senses another set of signals, the control unit turns on the next group of power transistors. This cycle allows the motor to continue rotating in the same direction until the control unit decides to stop the rotor by turning off the power transistors (or only turning on the lower arm power transistors); to reverse the rotor, the power transistor switching sequence is reversed. Basically, the power transistor switching method can be exemplified as follows: AH and BL pair → AH and CL pair → BH and CL pair → BH and AL pair → CH and AL pair → CH and BL pair, but never AH and AL or BH and BL or CH and CL. Furthermore, because electronic components always have switching response times, the response time of the components must be considered during the interleaved off/on times of the power transistors; otherwise, if the lower arm (or upper arm) turns on before the upper arm (or lower arm) has completely turned off, it will result in a short circuit between the upper and lower arms, burning out the power transistors.

Elektror motor classification

Motors are classified by the supply method of excitation current. Permanent magnet synchronous motors are synchronous motors that use permanent magnets to establish the excitation magnetic field; their stator generates a rotating magnetic field, and the rotor is made of permanent magnet material. Synchronous motors require a DC magnetic field for energy conversion; the DC current producing this field is called the motor's excitation current. Separately excited motor: a motor that obtains excitation current from another power source. Self-excited motor: a motor that obtains excitation current from the motor itself. Classified by supply frequency, permanent magnet brushless motors include two types: permanent magnet brushless DC motors and permanent magnet brushless AC motors; both require variable frequency power supply when operating as motors. The former requires only square wave inverter power supply, while the latter requires sine wave inverter power supply. Classified by air gap magnetic field distribution: Sine wave permanent magnet synchronous motor: poles use permanent magnet material; when input with three-phase sine wave current, the air gap magnetic field distributes according to sine law, abbreviated as permanent magnet synchronous motor. Trapezoidal wave permanent magnet synchronous motor: poles still use permanent magnet material, but input with square wave current, resulting in trapezoidal wave distribution of the air gap magnetic field, with performance closer to DC motors. Self-controlled variable frequency synchronous motors constructed with trapezoidal wave permanent magnet synchronous motors are also called brushless DC motors.

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