Birgjar orkuendurgjöfartækja minna á að breytilegir tíðnihraðastýringarmótorar, skammstafað sem breytilegir tíðnimótorar, eru almennt hugtak yfir vélar sem knúnar eru af tíðnibreytum. Kosturinn við þá er að þeir hafa ræsingarvirkni; rafsegulfræðileg hönnun dregur úr viðnámi statorsins og snúningshlutans; aðlagast tíðum skiptingum við mismunandi vinnuskilyrði; að einhverju leyti sparar það orku. Sem stendur er þetta orðið aðal hraðastýringarkerfið og er hægt að nota það víða í ýmsum atvinnugreinum stöðugt breytilegra gírkassa.
(1) The reactance of high-speed motors is small, and high-order harmonics will increase the current value. Therefore, when choosing a frequency converter for high-speed motors, the capacity of the frequency converter should be slightly larger than that for ordinary motors. When the GD2 of the drive system is constant, the speed range of high-speed motors is wide, and the time required for acceleration/deceleration is relatively long. Therefore, the acceleration/deceleration time should be set slightly longer.
(2) When a frequency converter is used for a variable pole motor, it can be used when the speed range of the frequency converter is wider, but full attention must be paid to selecting the capacity of the frequency converter so that the maximum rated current of the motor is below the rated output current of the frequency converter. In addition, when switching the number of poles during operation, please stop the motor first. If switching is done during operation, it may cause overvoltage protection or overcurrent protection to operate, resulting in the motor idling and serious damage to the frequency converter.
(3) When driving explosion-proof motors, the frequency converter should be placed outside of hazardous areas or inside explosion-proof enclosures due to the lack of explosion-proof structures.
(4) When using a frequency converter to drive a gear reduction motor, the range of use is limited by the lubrication method of the rotating parts of the gear. At high speeds above the rated speed, there is a risk of running out of lubricating oil, so the maximum allowable speed should not be exceeded. Attention should also be paid to the noise produced by the gears.
(5) When a frequency converter drives a wound rotor asynchronous motor during operation, due to the low impedance of the wound rotor asynchronous motor, overcurrent tripping caused by ripple current is prone to occur. Therefore, a frequency converter with slightly larger capacity than usual should be selected. Generally, wound rotor asynchronous motors are often used in situations where the flywheel torque GD2 is large, and attention should be paid to the setting of acceleration/deceleration time.
(6) When driving a synchronous motor, the output capacity will decrease by 10% compared to the power frequency power supply. The continuous output current of the frequency converter should be greater than the product of the rated current of the synchronous motor and the standard value of the synchronous traction current.
(7) For loads with large torque fluctuations such as compressors and vibrators, as well as peak loads such as hydraulic pumps, if the frequency converter is determined based on the rated current or power value of the motor, there is a possibility of overcurrent protection action due to peak current. A feasible approach is to observe the current waveform during power frequency operation and select a frequency converter with a rated output current greater than its maximum current.
(8) Þegar dælumótor er knúinn með tíðnibreyti ætti málstraumur tíðnibreytisins að vera meiri en málstraumur dælumótorsins því málstraumur hans er hærri en venjulegs mótors.
(9) Einfasa mótorar henta ekki til aksturs með tíðnibreytum. Þegar notaður er einfasa mótor með rafgeymi getur rafgeymirinn skemmst vegna áhrifa straums frá háum tíðni.
Við notkun breytilegs tíðnihraðastýringarkerfis geta einhverjar bilanir stafað af mótornum. Þess vegna er, auk þess að athuga tíðnibreytinn, einnig nauðsynlegt að athuga hvort hver hlekkur mótorsins sé eðlilegur. Einnig skal huga að viðhaldi rafmótora í daglegri notkun.