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










Image Number 3 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
Method and system for coordinating client and host security modules
Fuel cell module
Voltage generating system and memory device using the same
Solid-state imaging apparatus
Apparatus and method for transmitting and receiving data streams in wireless system
Rule-based stimulation program search
Point-of-sale cart
  Randomly Featured Patents
Method for obtaining foamed organosilicon composition
Magnetic recording medium and a method for producing it
Thrust Plate Retaining Device for Radial Piston Pumps
Auto-grip clothes holding elements
System and method for intelligent mode switching in a communications environment
Electronic practice device
Pressure sensitive adhesive, particularly for apolar surfaces
Flexible medium access control (MAC) for ad hoc deployed wireless networks
Hydrocyanation of diolefins and isomerization of nonconjugated 2-alkyl-3-monoalkenenitriles
Pressure sensors having neutral plane positioned transducers