bldc motor can overcome the shortcomings of these well-known stepper motors. They are very efficient through optimized motor control, and because of stepless motion, their control is smoother and quieter, thus consuming less electricity and generating less heat.
On the other hand, when using bldc motor, the overall system cost will be higher. This is partly due to the need to control bldc motor in a single-chip computer to run more complex algorithms.
In addition, from stepper motor to bldc motor, besides developing control software, it is necessary to redesign the mechanical subsystem. These requirements can significantly increase project costs and time to market.
Finally, when the design is completed, the team must spend time collecting long-term reliability data. A better solution is that if the stepper motor drive can rotate as efficiently as a bldc motor, and the noise is low, there is no need for a large number of redesigned or expensive control elements.
In this way, designers can launch the next generation of devices that are quieter, more environmentally friendly, without cooling fans, and more reliable.
By improving the stepper motor controller in two key areas – adjusting the motor drive current and stepper pulse generation method – the existing mechanism can provide the required bldc-like performance.
To solve this problem, ON Semiconductor developed LC898240 current controller, which provides a method to automatically optimize the driver’s constant current settings when the motor load changes. This allows stepper motors to drive efficiently, similar to bldc motor, and minimizes audible noise and wasted energy.