一般地說，電動(dòng)機(jī)是電阻、電感和反電動(dòng)勢(shì)的混合負(fù)載，某些時(shí)間段內(nèi)電動(dòng)機(jī)可能向電源(你的LM3886)傳輸能量，即電流“倒灌”。
你的LM3886及其附屬電路是否有這個(gè)能力？

電機(jī)驅(qū)動(dòng)目前用的是LM12CLK。
LM12的一般描述是這樣說的：
The LM12 is a power op amp capable of driving ±25V at ±10A while operating from ±30V supplies. The monolithic ICcan deliver 80W of sine wave power into a 4W load with
0.01% distortion. Power bandwidth is 60 kHz. Further, a peak dissipation capability of 800W allows it to handle reactive loads such as transducers, actuators or small motors
without derating. Important features include:
? input protection? ?? ?? ?? ?? ???? controlled turn on? ?? ?? ?? ? ? thermal limiting? ?? ?? ? ? overvoltage shutdown? ?? ?? ?? output-current limiting? ?? ?? ?? ?? dynamic safe-area protection
The IC delivers ±10A output current at any output voltage yet is completely protected against overloads, including shorts to the supplies. The dynamic safe-area protection is
provided by instantaneous peak-temperature limiting within the power transistor array.
The turn-on characteristics are controlled by keeping the output open-circuited until the total supply voltage reaches 14V. The output is also opened as the case temperature exceeds
150°C or as the supply voltage approaches the BVCEO of the output transistors. The IC withstands overvoltages to 80V.
This monolithic op amp is compensated for unity-gain feedback, with a small-signal bandwidth of 700 kHz. Slew rate is 9V/μs, even as a follower. Distortion and capacitive-load stability
rival that of the best designs using complementary output transistors. Further, the IC withstands large differential input voltages and is well behaved should the common-mode range be exceeded.
The LM12 establishes that monolithic ICs can deliver considerable output power without resorting to complex switching schemes. Devices can be paralleled or bridged for even
greater output capability. Applications include operational power supplies, high-voltage regulators, high-quality audio amplifiers, tape-head positioners, x-y plotters or other
servo-control systems.
而LM3886的一般描述是這樣說的：
The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz.
The performance of the LM3886, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKe?) protection circuitry, puts it in a class above discrete and hybrid amplifiers
by providing an inherently, dynamically protected Safe Operating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage,
undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks.
The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0μV. It exhibits extremely low THD+N values of 0.03% at the rated
output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.
只有一個(gè)dynamic safe-area 是共有的。
LM12太貴了。第一次玩，想弄個(gè)便宜一點(diǎn)的學(xué)習(xí)。

基本沒見過‘能’。

直接驅(qū)動(dòng)？給電機(jī)外加個(gè)驅(qū)動(dòng)很難嗎？

宋業(yè)科 發(fā)表于 2013-9-7 07:27
能。
您用過?或者見別人用過?

DC電機(jī)而不是AC

非常有限的條件下確實(shí)能，但這么做沒有普遍意義，至少做產(chǎn)品或工程項(xiàng)目是不適合的。玩玩的話，隨便。

聽?zhēng)孜焕洗蟮模艞塋M3886。

直線電動(dòng)機(jī)驅(qū)動(dòng)器就是一個(gè)放大器。