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In discrete steps or fractions of a revolution, microstepper motors rotate. For illustration, a microstepper motor with a 1.8 degree step angle will complete 200 steps for each complete motor rotation.
The motor’s rotation is not completely smooth due to this discrete motion, and the slower the revolution, the less smooth it is because of the comparatively big step size.
Reducing the size of the motor’s steps is one technique to solve this lack of smoothness at low speeds. Herein lies the value of microstepping.
Each whole step is divided into smaller steps by microstepping control to assist the motor rotate more smoothly, especially at slow speeds.
A 1.8 degree step, for instance, can be divided up to 256 times, yielding a 0.007 degree step angle, or 51,200 microsteps every revolution. Using pulse-width modulated voltage to direct current to the motor windings, microstepping is made possible.
The motor windings receive two voltage sine waves that are 90 degrees out of phase from the driver. Current in one winding increases while decreasing in the other winding. In comparison to full- or half-step control, this progressive transfer of current produces smoother motion and more consistent torque.
The Global Microstepping Motor market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
An further product has been released by Toshiba Electronics , expanding their lineup of micro-stepping motor driver ICs. The dual channel, high resolution, micro-stepping motor driver IC known as the TC78H670FTG can operate motors with a variety of operating voltages.
The product is designed for a wide range of consumer applications, including battery-operated medical devices, portable printers, handheld scanners, 3D printers, cameras, security cameras, and portable printers. A micro-stepping motor with up to 128 steps can be driven by the IC at currents of up to 2 A and voltages between 2.5 V and 16 V.
The TC78H670FTG uses Toshiba’s most recent CDMOS technology, which lowers voltage loss and heat generation inside the driver and results in an output on-resistance of only 0.48.
Motors can be controlled smoothly, silently, with less vibration, and with better rotation angle precision thanks to micro-stepping control. Included safety measures include open-load detection, thermal shut-down, and over-current detection.
The motor driver is placed in a small QFN16 package with a footprint of just 3 mm x 3 mm, which, coupled with the removal of the two bulky and expensive current sensing resistors through the use of on-chip current detection, significantly reduces the cost and amount of space needed in designs.
