SU1C40AC

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The SU1C40AC is the first four-axis motion control integrated IC realized without additional controller peripherals and can complete the four-axis motion control of the drive in a minimized size. This IC is suitable for multi-axis automation systems, such as motorized goshawks, industrial robots, and automotive engine NVH system testing. It is popular in digital control systems at the motion level.

The SU1C40AC contains four main blocks: Internal bus controller (IBC), integrated power stage (IPS), signal conditioning block (SCB) and phase commutation block (PCB). The IBC can be programmed through the SPI interface for speed, position, and torque arguments, and is responsible for the logic control of the motor control system. For example, this integrated IC provides acceleration/deceleration settings, position/relative position limits, immediate stop/fault output and so on. The IPS interface contains the logic to provide the appropriate current for the four phases of the motor, and is additionally responsible for the generation of the PWM source for the fourth order decay current loop. The SCB provides the signal conditioning and rectification for the motor\'s back-EMF. And it can obtain the speed measurement information, and then sends it back for adjusting the duty cycle of the PWM signal and the time of open/close the switches in time. The PCB provides the bridge connection for the voltage source and inductor input currents for phase commutation of motor.

In terms of application, the SU1C40AC is a four-axis, low-end motoring IC with externally driven power stages. It can be used in the automotive engine NVH system test, 3D printing, motorized goshawks, industrial robots and other motor applications, such as lead screw and rack and pinion systems. At the same time, compared to existing motor control solutions based on external power stages, its performance is also very good. its minor external components, integrated multi-axis control, Motor protection power control and flexible general feature are all excellent.

The working principle of a SU1C40AC based four axis motion control system is as follows. First, the system sends SPI-based commands to an SPI based command communication interface to update the various motion control setpoints of the IBC. Then, the IBC will then process these commands and configure the IPS, SCB andPCB blocks accordingly. The IBC will then generate a set of PWM signals based on the commanded speed and position setpoint. Then, the IPS will then apply the appropriate voltage levels to the power stage based on the PWM signal, while the SCB will monitor the motors to detect back-EMF signals from the motor phases. The SCB will then process the detected back-EMF signals and will feed the processed signals to the IBC, which will in turn modify the PWM output signals to theIPS to change the motor\'s operating speed and direction. Finally, the PCB block will apply the appropriate phase commutation logic to adjust the voltages applied to the motor phases to ensure that the motor\'s operating characteristics remain as commanded.

In conclusion, the SU1C40AC is an integrated four axis motion control solution with several benefits compared to existing solutions. Its low external component count, integrated four axis control logic, motor protection power control, and flexible general feature set make it ideal for 3D printing, motorized goshawks, industrial robots, and automotive engine NVH system testing.

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