Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Step motor control










Image Number 5 for United States Patent #4734631.

A step motor control system which can control a step motor to rotate at a variable high speed like a brushless motor. A position signal indicating a position of a rotor of a step motor relative to a specific one of field windings is detected as a voltage signal which is successively compared with a reference voltage in order to detect a specific angular position of the rotor at which selective energization and deenergization of the field windings are started for a next stepping operation of the motor.The position signal may be extracted as a voltage signal from an electric current flowing through a last energized field winding by a resistor connected thereto. From the voltage signal, a back EMF induced in the field winding due to its self inductance is subtracted to detect a voltage position signal or EMF induced in the field winding by a permanent magnet of the rotor. The back EMF is produced by an electronic simulation means including an integrating circuit having a same time constant with the field winding.








 
 
  Recently Added Patents
Magnetic detection of small entities
Writing implement
Customizing a range of acceptable tape dimensional stability write conditions
Owner-brokered knowledge sharing machine
Desk
Managing aging of silicon in an integrated circuit device
Method and apparatus for receiving signals in a MIMO system with multiple channel encoders
  Randomly Featured Patents
Process for connecting electric contact points using anodic bonding
Nozzle construction for a gas torch
Guide and cover arrangement for printers
Combinations of ileal bile acid transport inhibitors and bile acid sequestering agents for cardiovascular indications
Hand splint
Audio-video communication system for receiving person at entrance
Device having a plurality of ionizable gas filled channel in a gas-tight envelope, each channel provided with a pair of electrodes
Method of manufacturing acceleration sensor
Automatic setup of reflector instances
Cyclic ketones as blocking agents