在為應用程序指定電機時，許多工程師可能會在這個問題上崩潰;我應該使用步進或伺服電機嗎？
Both stepper and servo motor are excellent but, what’s really important is understanding their capabilities. The simplest way to understand the difference is to consider speed. Servo motors are better for high speed applications while stepper motor are better for low speed applications. Let’s take a look at a simple example of belt drive application.
From the example above, let’s assume below are our requirements:
Travel requirement: 2500mm/sec
Stroke: 2 meter
負載：1 kg
Motor Sizing Example Results:(Sizing result is based on pulley diameter on the belt drive system)
Before you can select a stepper or a servo system, you’ll first need to know what the motor requirements are for your application. You’ll need to calculate inertia, required torque, and required speed. You will also need to add safety factors for the required torque calculation.
As an example, let’s say the required speed for this application is 2871 r/min, and the required torque is 3.117 lb-in, or 48.87 oz-in. Based on these needs, let’s compare a Nema 23 size servo and stepper motor side by side.
As you can see from the speed toque curve above, Stepping motor would have a higher starting torque at low speed, but as speed increases, the torque curve falls. Comparing it with the servo motor torque curve, the servo motor might not have a high starting torque, but a servo system maintain its torque quite well at higher speed, which is why for a high speed positioning application a servo system would be preferred.
通過繪製我們應用程序落在扭矩曲線上的圖表上，我們可以突出顯示我們高速應用的係統性能的差異。這標識了我們應用的最佳選擇是伺服電機。使用步進器不會為伺服係統留下應用程序的安全係數。如上所述，我們的扭矩要求為48.87盎司。
If you have any additional questions regarding stepper or servo motors, the MISUMI Engineering Team is always ready to help and available atengineering@misumiusa.com.
It looks like you’ve compared the 48V servo torque-speed curve with the 12V stepper torque-speed curve. At 48V and 2800 rpm, the stepper puts out nearly 50 oz-in. It’s certainly still less than the servo at that speed, but a significant improvement relative to the 12V curve that you’ve highlighted.
You’re right! Thanks for pointing that out for us! Our engineer Vick mistakenly used the 12VDC instead of 48VDC. The correct information is now noted in the article. I apologize for the inaccuracies. The advantage of using a servo over a stepping motor would be that a servo motor would be able to maintain torque at higher speed, hence suitable for applications that requires rapid long distance positioning.
You’re right! Thanks for pointing that out for us! Our engineer Vick mistakenly used the 12VDC instead of 48VDC. The correct information is now noted in the article. I apologize for the inaccuracies. The advantage of using a servo over a stepping motor would be that a servo motor would be able to maintain torque at higher speed, hence suitable for applications that requires rapid long distance positioning.
The servo motor is a double torque version which is about twice the price than a regular servo motor. Taking this into consideration plus a 48V stepper, the best choice shouldn’t be the stepper ??
With regards to your response, stepping motor part number STM23IP-3EE compared to Servo motor SMT23375DT are very similar in size. Please see table below to see specifications side by side.
From the table above, we can see that it may look like the stepper motor would have a superior performance compared to the servo. However, when we look at the high speed toque curve, a Servo system can maintain a fairly constant flat torque curve compared to a stepper. (Please refer to stepping motor (48VDC) VS Servo Torque curve above).
STM24IP-3EE
連續扭矩 - 200盎司
峰值扭矩 - 255盎司
Encoder Resolution – 4000
步長- 50000 /牧師
Closed Loop – Yes (Stall prevent)
安裝 - NEMA 23*(8mm shaft)
電機長度 - 125.5毫米
SMT23375DT.
Continuous Torque – 83 oz in
峰值扭矩 - 157盎司
Encoder Resolution – 4000
Step Size – 4000 (same as encoder count)
Closed Loop – Yes
安裝 - NEMA 23
Motor Length – 115.3mm
哪一個更好？？
要回答這個問題，這兩個係統都取決於您的應用程序。如果您的申請需要低速和高扭矩，步進將是一個很好的候選人。（成本效益）
如果您的應用需要高速和高扭矩，則伺服將是您選擇的係統。TM24IP
我不一定必須使用animatics SmartMotor作為良好的比較，因為它具有比顯示的步進驅動器更多的整體能力。
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