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Electronic Circuit Supplies is a leading distributor for chemical milling, electroplating, and printed circuit boards supplies.
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K.V. Madanagopal | ED Online ID #5842 | October 13, 2003
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The fundamental circuit shown in Figure 1 generates timing for a twophase stepper motor from an oscillator, as well as a direction (forward or reverse) signal. Figure 2 depicts the typical timing signals for a twophase stepper motor.
A clock from a source (like a timer, PWM output, etc.) is input to a twoinput XOR gate. Another input, F/_R, inverts the clock if it's at Logic 1. A flipflop divides the pulse train output of the XOR gate by two to create CLK A. Dividing the inverted output of the XOR gate by two creates CLK B. CLK A will lead CLK B. However, when the F/_R signal goes low, CLK B will lead CLK A, reversing the motor's direction. Thus, the F/_R input can be used to control the direction of rotation. A level translatorbuffer can be added after CLK A and CLK B to generate bipolar logic levels for driving the motor. The stepping rate is half the clock rate. The CLR input resets the circuit into a known state after power on. Figure 3 shows the circuit's logic timing.
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Reader Comments
There is a problem with Figure 1 as illustrated. The exclusive OR gate, as shown, will not generate the Forward/_Reverse timing as described.
Setting the F/R signal to a logic "1" level will generate the timing as shown in Figure 3. Specifically, CLK A changes state on the falling edge of CLK, and CLK B changes state on the rising edge of CLK. Setting the F/R signal to a logic "0" level will cause CLK B to change state on the falling edge of the CLK, and CLK A to change state on the rising edge of the CLK, however, CLK A will still "lead" CLK B by 90 degrees.
A transition on F/R that occurs while the circuit is running will shift the phase of CLK A and B relative to CLK, but will not "reverse" the phasing between CLK A and CLK B such that CLK B now leads CLK A.
One item that would have been most interesting in the Design Brief and what would seem to be relevant to the phase relationships between CLK A and CLK B is the time [during the CLK cycle] when the CLR signal is negated.
There is an error in the article. In both Fig.2 and Fig.3 Clk A leads Clk B. You can see it by comparing the Low to High transitions of Clk A and Clk B. The Xor gate should be connected in series of Clk A output or Clk B output in order to control the Forward /Reverse timing.
Regards, Victor Koren, Senior Analog Designer, ST Microelectronics, TelAviv
AUTHOR REPLIES: The circuit as it is would require a synchronous reset with the direction change signal for it to work.Compact design to provide a double sided panel cleaning operation utilising abrasive brushes with integral water rinsing and drying.
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General Specification Double Sided Board Cleaner with Oscillation
Part Number VZDE00 Double Sided Board Cleaner with oscillation, rinse stage & dryer
BRUSHING SECTION
Brush Type 610mm long x 100mm diameter with 25.4mm bore
Number of Brushes 2
Brush Adjustment Handwheels, one per brush
Brush Oscillation Length of Travel 3mm total
Brush Speed 2000 rpm
Brush Motor 2off 1.1kW TEFC induction
Oscillation Motor 2off 97 rpm 3 phase induction
Pressure Indication Current Indication one per brush shaft
Brush Bearings Heavy duty self aligning double sealed to prevent ingress of dust or moisture and mounted in a water cooled casing to prevent possibility of heat build up
SPRAYING SYSTEM
Brush Spray System One spray bar per brush directed at brush for maximum cleaning effect, operated from mains connection pressure
Board Rinse Stage Spray Bars One upper, one lower. Operated at mains connection pressure
Spray Nozzles "V" jet high impact
Water Consumption 50 litres/min @ 0.7kg/cm2 (11 gal/min @10psi)
DRYING STAGE
Air Knives 4 (2 upper 2 lower)
Blower Unit High velocity multistage low noise radial blower
Heater 3kW with thermostat mounted in plenum chamber on blower unit
Normal operating range 4050oC Cabinet protection via thermostat
CONVEYOR
Motor Thyristor controlled variable speed dc shunt wound motor
Drive System Chain driven, worm and worm wheel gearing
Speed Range 02 mts/min (0 6 feet/min)
CONSTRUCTION
Principle Materials Stainless steel, PVC, Vinyl Ester Pultruded Fibreglass
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