發送短信 : Computerised control of DC motor field weakening and constant power performance

  ______    _____    _____     _    _    _    _   
 /_   _//  |  ___|| |  __ \\  | || | || | || | || 
   | ||    | ||__   | |  \ || | || | || | || | || 
  _| ||    | ||__   | |__/ || | \\_/ || | \\_/ || 
 /__//     |_____|| |_____//   \____//   \____//  
 `--`      `-----`   -----`     `---`     `---`