WEIHONG 200 Series Manufacturer's Manual

上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
Specialized, Concentrated, Focused - 31 -
the teeth number of driven wheel to that of driving wheel. When applied in CNC machines, it specifies
the ratio of motor speed to screw speed.
Reducer input speed Driven wheel teeth number Motor speed
Reducer output speed Driving wheel teeth
Mechanical decelera
number Screw
ti
s
on= = =
peed
Pitch (d): The axial distance between the corresponding points of two adjacent teeth on the threads.
The calculation of pulse equivalent varies with different motor systems.
 Stepping Motor
In general, firstly set the subdivision and then calculate the pulse equivalent. You can set the pulse
equivalent before calculating subdivision. Their relationship can be shown as:
360dm
x
pn 
  
Hereinto, p stands for pulse equivalent, x represents subdivision of stepping motor while θ refers to
stepping angle. Therefore,
screw pitch
Pulse equivalent
360
subdivision mechanical deceleration ratio
stepping angle


For instance, the selected screw lead of X-axis for a certain type of machine tool is 5mm, and the
stepping angle of stepping motor is 1.8 degree, with ―10‖ subdivision and motor directly connected with
screw by coupling. Thus, the pulse equivalent of X-axis is:
5mm
Pulse equivalent 0.0025mm/p
360
10 1
1.8


 Servo Motor
In general, set the default value of pulse equivalent as 0.001mm/p and calculate electronic gear
ratio (B/A). Their relationship can be shown as:
B encoder resolution pulse equivalent
Electronic gear ratio mechanical deceleration ratio
A screw pitch


Namely,
n
m
d
pF
A
B



Electronic gear ratio (B/A): the parameter of servo driver (take YASKAWA driver as an example, B is
PN202 while A PN203). This ratio represents servo scales up or down the pulse frequency sent by CNC
system. When B is larger than A, it means scaling up and vice versa. For example, provided the pulse
frequency sent by CNC system is 100HZ, if the numerator of electronic gear ratio (B) is set as 1 while the
denominator 2, the actual running speed of servo is 50HZ. On the contrary, if the numerator is set as 2
while denominator 1, the actual running speed turns to 200HZ.
Encoder Resolution (F): needed pulse number for one circle of servo motor. Please see the servo
motor label plate and then refer to the corresponding manual to confirm its encoder resolution. A label
plate of YASKAWA SGMSH type motor is as below, and the 4th character in motor type is the serial
encoder specification, so the resolution of this motor is 2
17
, i.e. 131072.

WEIHONG 200 Series Specifications

General

Brand	WEIHONG
Model	200 Series
Category	Control Systems
Language	English