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It’s not easy being Vacuum Cleaner DC Motors a brushed dc motor these days. Although this is the oldest dc-motor configuration, in recent decades it seems that brushless dc and stepper motors have been getting most of the attention and glamour. This deserved position is largely due to their unique performance attributes and controllability, which is mostly the result of improved switching devices supported by microcontroller-based management via efficient algorithms.
In contrast, some designers may think of the brushed motor as a hard-to-control, unreliable, electrically noisy relic (those brushes!) of the past.However, the reality is that the brushed dc motor is a cost-effective solution for a wide range of applications, such as line or battery-powered 12- to 36-V industrial devices, home appliances such as coffee machines and robotic vacuum cleaners, ticket/receipt printers, medical devices such as infusion pumps, and electronic door locks that require a high-current impulse-like drive. When coupled with an enhanced driver that maximizes their basic functionality, they are a viable prime mover for these and other applications.To meet this need,
Toshiba Electronics has added a new brushed-motor driver to its portfolio of single-channel dc motor-driver ICs see figure. The in a small HSOP8 package measuring just chopper-type driver that supports both PWM constant-current drive and direct PWM drive. It has four operational modes: Forward, Reverse, Brake, and Stop (Off).The driver operates from a .A good motor driver comes with protection, recognizing that faults are part of the reality of motor applications.
Among the protection mechanisms built into the are undervoltage lockout , auto-return thermal shut-down, and non-latching overcurrent protection . Note that Toshiba’s existing driver, the , features a latching overcurrent detection that turns the output off indefinitely until power cycles or its circuit enters and leaves standby mode. In contrast, the this new is non-latching and resumes function automatically after a programmable recovery time, once the overcurrent condition is removed.
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