LENZE伺服放大器EVS9326-ES特價(jià)代理
齒輪減速電機(jī)是固定轉(zhuǎn)速的減速電機(jī),一旦速比選定,電機(jī)選定,后輸出轉(zhuǎn)速是固定的。但實(shí)際使用中,還有許多場(chǎng)合要求速度有所變化,如車床的主軸速度、各種攪拌器的攪拌軸速度、輸送不同物品時(shí)的輸送機(jī)速度等,如何調(diào)速是工程技術(shù)人員甚為關(guān)心的話題。下面把目前工程上應(yīng)用的各種調(diào)速方法進(jìn)行簡(jiǎn)述。
1.有級(jí)調(diào)速變極調(diào)速是簡(jiǎn)單和經(jīng)濟(jì)的調(diào)速方法。但只限于中小容量(2kw以下)和起動(dòng)次數(shù)不多的場(chǎng)合。通常只能有兩檔速度,能達(dá)到的調(diào)速比也較小(l:2一6),極限做到三檔;在某些特定的行業(yè),如車床等,往往用帶排檔的齒輪箱進(jìn)行有級(jí)調(diào)速。雖有兒檔速度,但調(diào)速范圍不大。
2.無(wú)級(jí)調(diào)速可分成機(jī)械式和電氣式。前者常見方法是在電機(jī)與齒輪箱聯(lián)結(jié)處插人機(jī)械無(wú)級(jí)調(diào)速裝置(主要有皮帶盤式、摩擦盤式)。其優(yōu)點(diǎn)是調(diào)速平穩(wěn),結(jié)構(gòu)不復(fù)雜,適用于惡劣環(huán)境;缺點(diǎn)是調(diào)速范圍小(一般在1:lO以內(nèi))盆皮帶和摩擦盤屬易耗件,需定期維護(hù)換。后者是對(duì)異步電機(jī)進(jìn)行串級(jí)調(diào)速、轉(zhuǎn)子電阻調(diào)速或?qū)χ绷麟姍C(jī)進(jìn)行調(diào)壓調(diào)速等。
工作壓力：輸入馬達(dá)油液的實(shí)際壓力，其大小決定于馬達(dá)的負(fù)載。馬達(dá)進(jìn)口壓力與出口壓力的差值稱為馬達(dá)的壓差。額定壓力：按試驗(yàn)標(biāo)準(zhǔn)規(guī)定，使馬達(dá)連續(xù)正常工作的壓力。
2．排量和流量
排量：在不考慮泄漏的情況下，液壓馬達(dá)每轉(zhuǎn)一轉(zhuǎn)所需要輸入液體的體積。Vm (m3/rad)流量：不計(jì)泄漏時(shí)的流量稱理論流量qMt，考慮泄漏流量為實(shí)際流量qM。
3．容積效率和轉(zhuǎn)速
容積效率ηMv：實(shí)際輸入流量與理論輸入流量的比值。
4．轉(zhuǎn)矩和機(jī)械效率
在不計(jì)馬達(dá)的損失情況下，其輸出功率等于輸入功率。實(shí)際轉(zhuǎn)矩T：由于馬達(dá)實(shí)際存在機(jī)械損失而產(chǎn)生損失扭矩ΔT，使得比理論扭矩Tt小，即馬達(dá)的機(jī)械效率ηMm：等于馬達(dá)的實(shí)際輸出扭矩與理論輸出扭矩的比. It is highly recommended that if the service factor is less
than 1.0 or greater than 2.0, that the application be discussed
with a Dings Representative or the designer of the
system or machinery.
The most common service factors are 1.0, 1.4 and 2.0.
For most standard applications, a 1.4 service factor would
be used. These types of application would include dynamic
stopping and holding applications where the brake would
typically provide a slightly greater amount of torque than the
motor output but still not create a high shock stop. A 1.0
service factor would typically be used in any non-critical or
non-holding applications where a soft stop (longer stop
time) would be required. A 2.0 service factor would be used
for applications where extra torque is required to ensure
adequate holding. These brakes would also have a faster
stop time and thus put more shock into the system.
In all cases, thermal capacity and/or stop time (dynamic
shock) should be considered for the application to ensure
proper brake sizing, torque level and service factor.
EVS9326-CSV003
EVS9326-ESV100
EVS9326-ESV004
EVS9326-ESV104
EVS9327-CSV003
EVS9327-ESV100
EVS9327-ESV004
EVS9327-ESV104
EVS9328-CSV003
EVS9328-ESV100
EVS9328-ESV004
EVS9329-ESV100
EVS9329-ESV004
EVS9330-ESV100
EVS9330-ESV004
EVS9331-ESV100
EVS9331-ESV004
EVS9332-ESV100
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