Brushless tachometer generator

Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator

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Details

310156, 310DIG3, 322 94, 322DIG5, H02P 900, H02K 2112

Patent

active

043640052

ABSTRACT:
A tachometer generator comprising a generator section for producing rectangular polyphase alternating voltages having a peak value which is proportional to the speed of the rotor, and a commutator section including contactless change-over switches for successively transferring the alternating voltages from the generator section, and sensors for producing switching signals which actuate the change-over switches in accordance with the rotational position of the rotor of the generator section. In the commutator section the sensors are equivalent in number to the change-over switches and comprise Hall devices arrayed about a rotary shaft which is coupled to the generator section. The alternating voltages which are obtained successively from the coils of the generator section as the rotary shaft rotates, are transferred in order by the change-over switches to produce a speed signal, in analog form; which is proportional to the rotating speed of the rotor. The axially extending width of the rotor is smaller than the axially extending width of the stator, the width of the rotor being approximately 80% that of the stator. A magnetic shield plate is interposed between the generator section and the sensors of the commutator section. The tachometer generator having the above arrangement generates more accurate speed signals and can be reduced in size since the generator and commutator sections are capable of being disposed closer together as a result of the provision of the magnetic shield.

REFERENCES:
patent: 3039040 (1962-06-01), Angus et al.
patent: 3165685 (1965-01-01), Manteuffel et al.
patent: 3508137 (1970-04-01), Hill
patent: 3603869 (1971-09-01), Neuffer et al.
patent: 4110676 (1978-08-01), Edick et al.

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