| 摘要 |
<p>Electronic solid state circuitry is provided which takes the place of Hall-effect sensors in brushless DC motors (10), providing output signals substantially the same as those of Hall-effect sensors. The Hall-effect sensors in existing motors may be deactivated or removed and functionally replaced by the solid state circuit. The circuit may include a number of D flip flops (20, 21, 22) and a NAND gate (23) connected to a voltage controlled oscillator (12) by a switch which is part of a start-up circuit (25). A direction reverse circuit, a sampling logic circuit (to determine which phase is non-energized at a particular point in time), and a commutation error detector circuit (15) are also preferably provided. New motors utilizing the circuitry have increased reliability and precise velocity regulation.</p> |
