Synthesis and baseline testing of a digital pulse-width-modulated clutch

James D Van De Ven, Jessy Cusack

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The switch-mode continuously variable transmission is the mechanical analog of a DC-DC boost converter circuit and allows coupling a high speed flywheel to a mechanical load. The system requires a high-frequency clutch with a variable duty ratio and low slip during engagement and disengagement. In this paper, the synthesis and baseline testing of a novel digital clutch for this application are presented. The custom clutch design utilizes a double dwell axial cam with a profile that varies with radius. The duty cycle of the clutch is controlled through positioning the radial location of three translating followers, connected through a linkage. The axial clamping force of the clutch is generated through designed deflection of the system components and springs in series with the cam followers. Through baseline testing, the clutch was operated at angular velocities up to 45 rad/s, creating clutch switching frequencies up to 22 Hz. The average clutch efficiency at 20% duty cycle was 55%, yet the efficiency is highly dependent on the duty cycle and can be improved in future testing.

Original languageEnglish (US)
Pages (from-to)81-91
Number of pages11
JournalMechanism and Machine Theory
Volume78
DOIs
StatePublished - Aug 1 2014

Fingerprint

Clutches
Testing
Cams
Flywheels
Switching frequency
Angular velocity
DC-DC converters
Switches
Networks (circuits)

Keywords

  • Digital clutch
  • Switch-mode continuously variable transmission
  • Variable cam

Cite this

Synthesis and baseline testing of a digital pulse-width-modulated clutch. / Van De Ven, James D; Cusack, Jessy.

In: Mechanism and Machine Theory, Vol. 78, 01.08.2014, p. 81-91.

Research output: Contribution to journalArticle

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