Anaheim Stepper M6R7 Product Sheet

							FEATURES
DESCRIPTION
910 East Orangefair Ln.  Anaheim, CA 92801     Tel. (714) 992-6990     Fax. (714) 992-0471     www.anaheimautomation.com
DIMENSIONS
  The design was the basis for 
classic drive designs and is still used 
on older systems with 5 lead motors, 
or very high voltage (24-30VDC) mo-
tors.  It allows for full/half step opera-
tion with a dropping resistor between 
the supply voltage and motor to limit 
the current.  While the L/R technique 
is simple and inexpensive, it is also 
ineffi cient due to the large power 
losses from the dropping resistor.
  A positive or negative going 
pulse (or train of pulses) a minimum 
pulse width of 15 microseconds 
is required to step the motor.  The 
driver phase outputs change state 
and the motor steps on the leading 
edge of the input pulse.  The maxi-
mum control pulse rate is limited 
by motor performance.  The M6R7 
driver has jumper selectable positive 
or negative pulse inputs.
 
M6R7 - Stepper Motor DriverM6R7 - Stepper Motor Driver
• Drives 4 Phase Motors with 5, 6 or 8 Leads
• Proven Reliability - Low Cost
• Versatile Applications
• Clockwise Clock with Direction Control
• Clockwise and Counterclockwise Control
• Full and Halfstep Operation
• Operates Over Wide Voltage Range
• Motor Turn-off Provisions
• TTL/CMOS - Compatible Inputs
• Compact and Rugged Package
   The direction input is pulled 
up to +5VDC through an internal 
10K ohm resistor.  When the Direc-
tion Control is not connected or a 
Logic “1” level is applied, the motor 
will step in the CLOCKWISE direc-
tion when the step control pulses 
are applied to the Step Input.  Simi-
larly, when a Logic “0” is applied 
the motor steps in the COUNTER-
CLOCKWISE direction.
  The CCW separate input 
for Counterclockwise clocks is 
jumper selectable for positive or 
negative pulse input.  Pulses ap-
plied to this step input cause the 
motor to step in the couterclockwise 
direction.
  The HS/FS SELECT input 
is used to select either Half-Step 
or Full-Step operation.  Half-Step 
operation is generally preferredbecause this mode provides bet-
ter resolution and reduces motor 
resonance.  The motor steps in 
increments of half the natural step 
angle, e.g. in 0.9 degree steps for a 
1.8 degree step motor.  In full-step 
operation, the motor steps in 1.8 
degree steps.
  The motor On/Off input is 
used to turn off all four phases of 
the motor in applications where 
holding torque is not required.
L010465 
						

							ADDITIONAL INFORMATION
910 East Orangefair Ln.  Anaheim, CA 92801     Tel. (714) 992-6990     Fax. (714) 992-0471     www.anaheimautomation.com
Model # Description Input Voltage Power (Watt)
PSK22784N Power Supply Kit, 200VA 110 or 220 VAC 300
Power Requirements: 20 - 38 VDC
Output Current Range: 6.5 Amps Max.
Inputs (All):TTL/CMOS - Compatible
Logic “0” - 0 to 0.8VDC
Logic “1” - 3.5 to 5.25VDC
Input Clock Frequency: 20 KHz
Storage Temperature: 0° - 50°
Absolute Maximum Driver 
Temperature:70° C
Driver Type:Unipolar, Compatible with 5, 6 and 
8 Lead Motors.
Torque Speed Curves
Specifi cations
Additional Ordering Information
  The key factor in obtaining good overall performance (torque verses speed) in the L/R Ratio.  The larger 
the L/R time constant, the better the performance.  This fact is graphically illustrated by the curves below.  If a 
step motor rated at 2.5VDC is driven from a 2.5VDC power supply (not possible with these drivers), without a 
series resistor, the performance would be limited.  This is considered a L/1R drive.
  By increasing the drive power supply to 15VDC and adding a series resistor between the drive and mo-
tor to limit the current, the L/1R drive becomes an L/6R drive (power supply is 6 times the motor’s rated voltage).
  This results in the improved L/6R speed-torque curve.  Further, an even greater increase in performance 
can be realized by increasing the power supply voltage to 30VDC and increasing the value of the series resistor.  
This would result in an L/13R drive when using the same 2.5VDC motor and a signifi cantly improved perfor-
mance shown in the L/11R curve.  L/10R is usually considered excellent.  These drivers may be operated at 
voltages ranging from 20VDC minimum to 38VDC maximum. 
  The examples given show how performance can be improved by varying the L/R time constant.  The 
power supply voltage could be increased to higher levels; however, practical limitation of power supply size, 
power dissipation in the series resistors, and motor driver constraints must be considered.
Additional Description L/R Drive