Stepper motor subdivision technology circuit principle system uses a single-chip sinusoidal subphase two-phase stepper motor drive special chip TA8435H, which greatly simplifies the hardware design. It integrates two H-bridge high-voltage, high-current dual-bridge drivers and two chopper circuits to control the current in the two-phase coils.
Receive standard TTL logic level signals to drive stepper motors with a voltage of 40V and 2.5A or less per phase. It has an enable input that allows or disables device operation without being affected by the input signal. The emitters of the bottom arms of the two bridge arms of each bridge are connected together and taken out, with an external sense resistor. It sets an additional power input to allow the logic to operate at low voltages.
The motor control unit uses the high-performance microcontroller mega16 as the main control chip. Mega16 uses an advanced reduced instruction structure, integrated 16K bytes of in-system programmable Flash, 1K bytes of on-chip SRAM, on-chip RC oscillator, and a variety of working modes to choose from, with a wider work Voltage range (2.7V ~ 5.5V).
Because there is no need for subdivision in the X and Y directions, a unipolar motor with a small current is used. The driver chip uses a Darlington tube ULN2803. The Z direction is the focusing direction. This motor must use a large current that can be subdivided. The bipolar motor is driven by the TA8435H. Optocoupler isolation is used between the MCU and the TA8435H chip to reduce the interference of the high current motor to the MCU. The logic circuit of the TA8435H is powered by a separate voltage regulator chip LM7805, which is isolated from the MCU. Through the control of the M1, M2, CW/CWW, ENABLE, and CK1 pins of the TA8435H, the motor can be reversed, coarse (no subdivision), and fine (8 subdivision) functions.
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