Stepper motor and servo motor are different in three points
Stepper motor drive and AC servo drive are the domestically produced CNC cutting machine drive modes . The CNC cutting machine itself is a numerical control device for rough machining. The size of the cutting precision is not related to what drive the device is equipped with. The size of the precision is related to many factors. Many customers believe that the servo motor can improve the cutting precision of the CNC cutting machine, and the AC servo must be configured. In fact, this view is wrong . Then, Shanxi Huaheng CNC explained to you today how the difference between stepper motor and drive motor is different.
First , the difference in frequency characteristics
The output torque of the stepper motor decreases with increasing speed and drops sharply at higher speeds, so the maximum operating speed is typically between 300 and 600 RPM . AC servo motor is a constant torque output, i.e. at its rated speed (3000RPM to 2000RPM or general) or less, can output rated torque, above the rated speed for the constant power output.
Second, the speed response performance is different
It takes between 200 and 400 milliseconds for the stepper motor to accelerate from standstill to operating speed (typically a few hundred revolutions per minute) . The AC servo system has better acceleration performance. Taking the Panasonic MSMA 400W AC servo motor as an example, it takes only a few milliseconds to accelerate from standstill to its rated speed of 3000 RPM , which can be used for control applications requiring fast start and stop.
Third , the low frequency characteristics are different
Stepper motors are prone to low frequency vibration at low speeds. The vibration frequency is related to the load condition and the performance of the driver. It is generally considered that the vibration frequency is half of the take-off frequency of the motor no-load. This low frequency vibration phenomenon, which is determined by the working principle of the stepper motor, is very detrimental to the normal operation of the machine. When the stepper motor works at low speed, damping technology should generally be used to overcome low-frequency vibration phenomena, such as adding a damper to the motor or subdividing the drive.
The AC servo motor runs very smoothly, and vibration does not occur even at low speeds. The AC servo system has a resonance suppression function, which can cover the rigidity of the machine, and has a frequency analysis function ( FFT ) inside the system , which can detect the resonance point of the machine and facilitate system adjustment.
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