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進電機步距角精度為35%,不累計。在負載的情況下,啟動頻率應更低。 步距角:即發(fā)送一個脈沖,相應的電角度旋轉。 工作頻率:步進電機一步步運行的最高頻率。減少噪音。(整步)兩相混合式步進電機,如果細分驅動器的細分數為8,176。還取決于細分驅動器的細分電流控制精度等其他因素,細分數越大精度越難控制。 步進電機驅動簡單,并且驅動和控制在一個開放的閉環(huán)系統(tǒng)內。低速時,驅動器提供良好的扭矩,是有刷電機同一幀大小5 倍連續(xù)力距,或相當于無刷電機一倍扭矩。步進驅動系統(tǒng)遲緩,在限定的范圍內,可以更好的 減少動態(tài)位置誤差。(2)在低速表現粗糙,除非微驅動器來驅動。(4)由于過載,他們消耗過多電流。(5)虧損速度比較高,并可產生過多熱量因此,他們噪音很大(尤其是在高速下)。對他們的可行性,這兒有一個限度,而他們的大小,定位精度主要依靠的是機器(例如,滾珠絲杠的精確度)。 當電動機驅動,在其全步模式,給兩個繞組通電時即2 相通電的時候(見圖 ),每一步的扭矩是相同的(除極少數的變異和傳動特性),在半步模式下,我們交替改變兩相電流,如圖 所示。換句話說,交替的步進距將時強時弱。扭矩明顯受制于較弱的一步,但在全步模式時,低速平滑有一個顯著的改善。當只有一個繞組通電時,通過用高電平來實現。只有一相通電,如果目前是增加了40 %的功率,同樣的總功率將會消散。( )。如果兩相電流是不平等的, 轉子位置將轉向更強的一極。以這種方式,步長是減少了,而低速平滑度得到大幅度提高。在這種情況下,繞組中的電流極為相似的兩個正弦波有90176。 電機被驅動好像轉換成了交流同步電機。它將旋轉 72轉。轉子有2部分,但每部分有50個齒。定子每5個齒有 8個極,完整的共有40個齒( ) 圖 200步混合標準電機 如果我們想象一個齒,是擺在2個定子極點每一齒隙中, 假設定子共有48個齒, 少于轉子齒數兩個。1/4和3/4圈也同樣可以排列。 繞組4個一組,并對角線方向的極性相反。通過開關第二組線圈的電 流,定子場模式旋轉45 176。相當 于轉子,這只轉過了四分之一齒間距,每一次旋轉要200個全步。該定位點 的位置與轉子齒全面接軌定子齒時相對應。因此產生的轉子位置并不符合轉子自 然定位點的位置。當然,如果系統(tǒng)關機,或在零相位位置,電機一旦通電將步進一大步。如果電機是同步電機,導致位置誤差將永遠是一個 176。電機不能細分,如個別一個或兩個位置誤差,是 由于噪聲,錯誤脈沖或控制器故障造成的。圖中點劃線所包圍的二個單元可以用微機控制來實現。 最新技術發(fā)展:國內外對細分驅動技術的研究十分活躍,高性能的細分驅動電路,可以細分到上千甚至任意細分。 對實際步距角的作用:在沒有細分驅動器時,用戶主要靠選擇不同相數的步進電機來滿足自己對步距角的要求。附件2:外文原文References: Stepping motor application and control[J]. Mechanical and ElectricalEngineering Technology, 2004,33(1):6970Stepping motor application and controlstepper motor is an electrical pulse will be converted into angular displacement of the implementing agencies. Put it in simple languagespeaking: When the stepper drive pulse signal to a receiver, it drives stepper motor rotation direction by setting a fixed point of view (and the step angle). You can control the number of pulses to control the amount of angular displacement, so as to achieve the purpose of accurate positioning。 put more wind for airconditioning. Reactive (VR), the domestic general called BF, have a mon threephase reaction, step angle of degrees。 Twophase, fourphase hybrid step angle is degrees more than a small size, great distance, and low noise。 (full step) the twophase hybrid stepping motor, if the breakdown of the breakdown of the number of drives for the 8, then the operation of the electrical pulse for each resolution of 176。, also depends on the breakdown of the breakdown of the drive current control accuracy and other factors, the breakdown of the number of the more difficult the greater the precision of control. Stepper motors have the following benefits: ? Low cost ? Ruggedness ? Simplicity in construction ? High reliability ? No maintenance ? Wide acceptance ? No tweaking to stabilize ? No feedback ponents are needed ? They work in just about any environment Inherently more failsafe than servo motors. There isvirtually no conceivable failure within the stepper drive module that could cause the motor to run away. Stepper motors are simple to drive and control in an openloop configuration. They only require four leads. They provide excellent torque at low speeds, up to 5 times the continuous torque of a brush motor of the same frame size or double the torque of the equivalent brushless motor. This often eliminates the need for a gearbox. A stepperdrivensystem is inherently stiff, with known limits to the dynamic position error. Stepper Motor Disadvantages Stepper motors have the following disadvantages: ? Resonance effects and relatively long settling times ? Rough performance at low speed unless a microstep drive is used ? Liability to undetected position loss as a result of operating openloop ? They consume current regardless of load conditions and therefore tend to run hot ? Losses at speed are relatively high and can cause excessive heating, and they ar