外文文獻(xiàn)及翻譯--三相異步電動(dòng)機(jī)的幾種調(diào)速方式-其他專業(yè)(編輯修改稿)
2025-02-24 08:58 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 bility: No slip loss, high efficiency。 Wiring simple, easy to control, low price。 A level speed, differential large, can not get smooth speed control。 With pressure and speed adjustment, with the use of electromagic slip clutch, smooth and efficient access to high speed characteristics. This method is suitable for the production does not require variable speed machinery, such as metal cutting machine Bed , Lift , Lifting equipment, Fans Water Pump And so on. Frequency Control Method 5 Frequency Control Method Frequency control is to change the motor stator Power supply Frequency, thus changing the speed of its synchronous speed method. Frequency control system main equipment is to provide variable frequency power supply Inverter , Inverter can be divided into AC DC AC inverter and AC AC converter two categories, most of the current domestic use of AC DC AC inverter. Its characteristics High efficiency, speed the process without additional loss。 Wide range of applications, can be used for cage induction motor。 Speed range, features a hard, high accuracy。 Technical plexity, high cost, difficult maintenance and overhaul. This method is suitable for the high accuracy, good speed performance occasions. 3. Cascade Speed Regulation Method Cascade control method Cascade control is wound into the rotor circuit in the series of additional potential can be adjusted to change the motor39。s slip, to achieve speed control purposes. Most of the deterioration in power to be in series with the added potential absorbed, reuse generate additional devices to absorb the deterioration in power to return power to use or conversion of energy. Slippower absorption under way, cascade control can be divided into Motor Cascade control, mechanical and thyristor cascade control cascade control, and multiuse cascade control thyristor, characterized byCan speed the process of deterioration in loss of feedback to the work or production machinery, more efficient。 Installed capacity and speed range in direct proportion to investment, applicable speed range 70% 90% rated speed of production machinery。 Peed device failure can switch to full speed, to avoid the cutoff。 Thyristor cascade speed low power factor, harmonics greater impact. This method is suitable for fans, pumps and
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