Torque motors and valve assemblies

(19)

(11)

EP 0 202 011 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.08.1987 Bulletin 1987/35

(43)	Date of publication A2:
	20.11.1986 Bulletin 1986/47

(21)	Application number: 86302506

(22)	Date of filing: 04.04.1986

(84)	Designated Contracting States:
	DE FR GB IT

(30)

Priority:

04.04.1985 GB 8508803

(71)	Applicant: FAIREY HYDRAULICS LIMITED
	()

(72)	Inventors:
	Smith, John Denis () Davis, Peter James ()

(54)	Torque motors and valve assemblies

(57) A torque motor is arranged at each end of a common shaft, e.g. for driving a servo valve.
The motor comprises a rotor and a stator. Preferably, the rotor carries at least one pair of samarium cobalt permanent magnets at radially spaced positions, the core material being disposed between the magnets. Such a motor can be relatively compact whilst producing a high torque.

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