上海维宏电子科技股份有限公司
SHANGHAI WEIHONG ELECTRONIC TECHNOLOGY CO., LTD.
51 / 144
Electronic gear ratio
The ratio represents servo scales up or down the pulse frequency sent by CNC
system.
If the value is greater than 1, it means scaling up and vice versa.
Pitch
The moving distance per revolution of the motor.
Mechanical reducer ratio
It is calculated by one of the following:
Reducer input speed / Reducer output speed
Teeth number of driven saw wheel / Teeth number of driving saw wheel
Motor shaft speed / Screw speed
Encoder resolution
Needed pulse number for one circle of servo motor.
See the servo motor label plate and refer to the corresponding manual to confirm its
encoder resolution.
Step angle
The rotation degree of the motor corresponding to one pulse sent by CNC system.
Subdivision
During running the motor, the actual step angle is a fraction of the natural step angle
(full step).
3.3.2 Calculation Formula
This section introduces calculation formula related to pulse equivalent and
electronic gear ratio. The formula differs in motor axis type:
• Linear axis
– Stepper motor:
Pulse equivalent = Pitch / (360/Step angle * Subdivision * Me
chanical reducer ratio)
– Servo motor:
Electronic gear ratio = (Encoder resolution * Pulse equivalen
t) / Pitch * Mechanical reducer ratio
To Next Page
Loading...
