上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
- 68 - Specialized, Concentrated, Focused
For Stepping Motor
360
Pulse equivalent
360
subdivision mechanical deceleration ratio
stepping angle
For Servo Motor
B encoder resolution pulse equivalent
Electronic gear ratio mechanical deceleration ratio
A 360
5.3 Electronic Gear Ratio
5.3.1 Electronic Gear
Electronic Gear: assume that the system sends 5000 pulses per revolution of servo motor. When
doubling revolutions of servo motor driven by the same amount of pulses is needed, there are two
methods available, ―set servo parameters‖ and ―addition of mechanical gear between motor spindle and
load-spindle‖. Using circuit to realize the functions of mechanical gear is called electronic gear, viz. pulse
frequency multiplication function.
5.3.2 Electronic Gear Functions
Regarding ―Electronic Gear‖, it refers to a proportional control factor of output displacement to motor
when a certain amount of pulses is input. For the ―senior device‖ issuing pulses, it can be regardless of
encoder pulse No. and mechanical deceleration ratio in controlling.
Functions of electronic gear: it can set the command unit freely (the displacement of screw
corresponding to one pulse sent by the system). Frequency multiplication can be used to amplify the
frequency of pulse issued by the system.
Electronic gear ratio= encoder resolution × command unit × mechanical deceleration ratio / screw
pitch
Please see the servo motor label plate and then refer to the corresponding driver manual to confirm
the encoder resolution of servo motor. Fig. 5-6 is a label plate of YASKAWA SGMSH motor, and the 4th
character of the motor type is the serial encoder specification, so the resolution of this motor is 2
17
, i.e.
131072.
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