To drive the basic requirements of power supply

(1) drive power phase number, energizing way and the voltage and current are working to meet the needs of the stepping motor,
(2) to
rotating joint meet the stepping motor starting frequency and operation frequency requirements;
(3) can maximum limit inhibition stepping motor oscillation;
(4) work reliable, anti-interference ability;
(5) the cost is low, the efficiency high, installation and easy maintenance.
2, drive power composition
Stepping motor drive power basically by pulse generator, pulse distributor and pulse amplifier (also called power amplifier) three parts, as shown.
Into the motor drive power block diagram
(1) pulse generator
Pulse generator is a pulse frequency by a few Hector to dozens of kilohertz can the continuous variation of the pulse signal generator. Pulse generator can be utilized in a

variety of line, the most common are multivibrator and unijunction transistor a relaxation oscillator two kinds, they are all through the regulation resistance R and capacitance

C size to rotary union change capacitor charging and discharging time constant, so as to achieve the purpose of change the pulse signal frequency. Figure 6 are two practical much harmonic

oscillation circuit, they respectively by inverter and not gate structure, oscillation frequency by RC decision, change R value can change the pulse frequency.
Pulse generator practical appliances
(2) pulse distributor
Pulse distributor the gate and flip-flop composition logic circuit, it according to the instruction to the pulse signal according to
fiber optic rotary joint certain logical relationship and in the

pulse amplifier, stepping motor according to certain mode of operation work. Introduced the CH250 ring pulse distributor.
CH250 ring pulse distributor is three-phase stepper motor ideal pulse distribution
CH250 three-phase double three clap connection
CH250 ring pulse distributor is three-phase stepper motor ideal pulse distributor, through the control of the different connection can form three phase double three clap and

three phase six take different ways of working, as shown in figure 7,.
CH250 three-phase six pat connection
J3r, J3L two terminal is three-phase double three clap control end, J6r, J6L is three-phase six take control end, three phase double three clap work, if J3r = "1", and J3L =

"0", the motor is turn; If J3r = "0", J3L = "1", the motor reversal; Three phase six take power supply, if J6r = "1", J6L = "0", the motor is turn; If J6r = "0", J6L = "1",

motor reversal. R2 is double three clap the reset end, R1 is six shot the reset end, when using, first of all its corresponding reset end access high level, make it into the

work of the state, and then to change position. CL end is clock input, EN is clock pulse allows end to control clock pulse permission or not. When the pulse CP by CL end input,

only EN end for high electric at ordinary times, clock pulse rising edge to take effect. CH250 also allows to EN end for pulse CP input end, at this time, only CL for low

electric at ordinary times, clock pulse of the falling edge to take effect. A0, B0, C0 for circular distributor three output end, after pulse amplifier (power amplifier)

respectively after receiving stepping motor three-phase online.
CH250 ring pulse distributor function relations such as listed in table 1.
Table 1 CH250 menu
(3) pulse amplifier (power amplifier)
Due to pulse distributor output end A0, B0, C0 output current is small, such as CH250 pulse distributor output current is about 200-400 μ A, and stepping motor drive current is

larger, such as 75 bf001 type stepping motor each phase static current for 3 A, in order to meet the demand driven, pulse distributor output pulse subject to pulse amplifier

(that is, power amplifier) to drive stepping motor. Is a practical pulse amplification circuit in the photo, use level 3 transistor amplifier, the first level 3 dg6 small power

tube, the first secondary 3 dk4 power in the tube, and the third level 3 dd15 high power tube, R6 for stepping motor current limiting resistor, varies with the different

electric motor varies.
Pulse amplifier practical circuit
Shown is the single circuit voltage type driving power, and its features are: line is simple, resistance R6 and control winding series, can reduce loop time constant, But

because the R6 consumes power, the power of low efficiency, with this kind of power supply of the stepping motor starting and operation frequency is not too high.
High and low voltage switch drive power principle diagram
In order to improve the power efficiency and working frequency, can use high and low voltage switching type power supply, its principle as shown. High voltage power supply is

used to accelerate the speed of growth in the current, and low pressure is used to maintain the stable current value. Low voltage power supply in tandem a numerical smaller

resistance, its purpose is to adjust control winding current, make each phase current balance.