Limitations of conventional solenoids and the relation between solenoid power and operational speed are examined. The action of Helenoid actuators in overcoming problems inherent in conventional solenoids is described. These actuators are capable of armature travel times in less than one millisecond, irrespective of preloads or masses, even with the larger size and power required as duty increases. The Helenoid armature can be designed with higher accelerations for smaller armature movements. For maximum acceleration, the relation among pitch, wall thickness, and thread form must be optimized for a given stroke. A computer program has been developed to calculate armature acceleration using small (under one microsecond), reiterative time steps. Factors affecting armature acceleration and features of Helenoid actuators are noted. Relationships between eddy currents and flux penetration, materials and flux leakage, and inductance and power supply are illustrated. A method for determining preliminary estimates of actuator size is appended.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Congress and Exposition, Detroit, 26 February-2 March 1979.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Seilly, A H
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00386662
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 790119, HS-029 218U
  • Files: HSL, USDOT
  • Created Date: Jun 28 1984 12:00AM