CA2475936A1 - Linear motor - Google Patents

Linear motor Download PDF

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Publication number
CA2475936A1
CA2475936A1 CA002475936A CA2475936A CA2475936A1 CA 2475936 A1 CA2475936 A1 CA 2475936A1 CA 002475936 A CA002475936 A CA 002475936A CA 2475936 A CA2475936 A CA 2475936A CA 2475936 A1 CA2475936 A1 CA 2475936A1
Authority
CA
Canada
Prior art keywords
linear motor
resonant frequency
control strategy
maximum displacement
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002475936A
Other languages
French (fr)
Other versions
CA2475936C (en
Inventor
Gerald David Duncan
John Henry Boyd
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fisher and Paykel Appliances Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority claimed from CA002374351A external-priority patent/CA2374351A1/en
Publication of CA2475936A1 publication Critical patent/CA2475936A1/en
Application granted granted Critical
Publication of CA2475936C publication Critical patent/CA2475936C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • Y02B30/741—

Landscapes

  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Control Of Linear Motors (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

The present invention provides an improved design of linear motor as well as an improved control strategy. The design allows for a shorted stator, where the armature magnets are controlled to reciprocate to a greater maximum displacement than for an equivalent conventional linear motor. The control strategy is such that a minimum of external sensors are required. The linear motor is driven at its resonant frequency ensuring optionally efficient operation. A determination of the maximum current is made based on a relationship with the resonant frequency and the evaporating temperature/pressure of the vapour entering the compressor. The current is then limited to control the maximum displacement to avoid damage.
CA002475936A 1999-06-21 2000-06-21 Linear motor Expired - Fee Related CA2475936C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NZ336375 1999-06-21
NZ33637599 1999-06-21
NZ50051999 1999-10-19
NZ500519 1999-10-19
CA002374351A CA2374351A1 (en) 1999-06-21 2000-06-21 Linear motor

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002374351A Division CA2374351A1 (en) 1999-06-21 2000-06-21 Linear motor

Publications (2)

Publication Number Publication Date
CA2475936A1 true CA2475936A1 (en) 2000-12-28
CA2475936C CA2475936C (en) 2005-08-02

Family

ID=33303390

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002475936A Expired - Fee Related CA2475936C (en) 1999-06-21 2000-06-21 Linear motor

Country Status (1)

Country Link
CA (1) CA2475936C (en)

Also Published As

Publication number Publication date
CA2475936C (en) 2005-08-02

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