EP1942575A3

Method and apparatus for driving a DC motor

Abstract

A circuit for determining a direction of rotation of an electric motor, the motor having asymmetry and/or eccentricity in a profile of back electromotive force as a function of angular position of a rotor (5) with respect to a stator (6), the circuit receiving a signal representing the BEMF, and use the corresponding asymmetry and/or eccentricity in the signal to derive the direction of rotation. The signal representing the back emf can be generated by a control circuit. The control circuit can have a feedback loop regulator to generate a control signal (TL or TR) to control a current drive circuit (11,12) to control an amplitude of current (iw) in the windings, the feedback loop regulator being arranged to compare the amplitude of the current (iw) in the windings with a reference value (iset), and use the control signal to provide the signal representing the back electromotive force.

EP1942575A3, drawing sheet 1 — Sheet 1 of 1

Term

1.3 yearsto projected expiry

Projected expiry 2 January 2028, counted from filing; an application has no term until it is granted.

1 sheet

Sheet 1

Every citation, both ways

Citations
Document	Relation	Office	Cited during
EP1091480A1	Cites	European Patent Office (EPO)	Search report
US2005253546A1	Cites	United States of America	Search report
US5696430A	Cites	United States of America	Search report
US6160368A	Cites	United States of America	Search report

11 members in 5 offices; this record represents the family

This recordMember, by publication datePriority claim

Priority claims5

Priority claims
Document	Office	Kind	Date
0700033	United Kingdom	A	2007-01-02
0700033	United Kingdom	A	2007-01-02
0700033	United Kingdom	–	2007-01-02
0700033	–	–	–
GB20070000033	–	–	–

Members11

Family members, oldest first
Document	Office	Kind
EP1942575A2	European Patent Office (EPO)	A2	2008-07-09
JP2008167648A	Japan	A	2008-07-17
CN101232267A	China	A	2008-07-30
US2008197794A1	United States of America	A1	2008-08-21
TW200838119A	Taiwan Province of China	A	2008-09-16
US7592764B2	United States of America	B2	2009-09-22
CN101232267B	China	B	2012-07-04
JP5411428B2	Japan	B2	2014-02-12
TWI451688B	Taiwan Province of China	B	2014-09-01
EP1942575A3This record	European Patent Office (EPO)	A3	2016-06-15
EP1942575B1	European Patent Office (EPO)	B1	2020-04-08

82 legal events, as 9 offices reported them to INPADOC

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Events

Legal events, newest first
	Event	Code	Office
2024-09-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2024-06-28	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2023-05-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2023-05-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2022-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2022-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2022-10-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2022-10-03	Lapsed because of non-payment of the annual feeLapsedMM	MM	BE
2022-08-02	Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal feeWithdrawnR119	R119	DE
2022-01-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-09-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-09-29	Gb: european patent ceased through non-payment of renewal feeCeasedGBPC	GBPC	EP
2021-08-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-08-31	Patent ceasedCeasedPL	PL	CH
2021-05-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-05-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2021-03-17	No opposition filedOpposition26N	26N	EP
2021-02-26	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-02-26	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-02-26	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2021-02-12	No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE	PLBE	EP
2021-02-12	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA	STAA	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2021-01-29	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2021-01-12	No opposition filed against granted patent, or epo opposition proceedings concluded without decisionGrantedR097	R097	DE
2020-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-11-15	Deletion acc. to par. 5 (withdrawal of the translation of the ep patent)MK05	MK05	AT
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-10-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2020-09-25	Invalidated european patentMG4D	MG4D	LT
2020-09-16	Patent invalid in the netherlands as no translation has been filedMP	MP	NL
2020-04-29	European patents granted designating irelandGrantedFG4D	FG4D	IE
2020-04-23	Dpma publication of mentioned ep patent grantGrantedR096	R096	DE
2020-04-15	European patent takes effect as a national patent in ch/liEP	EP	CH
2020-04-15	Reference to at number (ep patent validated in austria)REF	REF	AT
2020-04-08	Designated contracting statesAK	AK	EP
2020-04-08	European patent grantedGrantedFG4D	FG4D	GB
2020-03-06	(expected) grantORIGINAL CODE: 0009210GRAA	GRAA	EP
2020-03-06	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE PATENT HAS BEEN GRANTEDSTAA	STAA	EP
2020-03-02	Grant fee paidORIGINAL CODE: EPIDOSNIGR3GRAS	GRAS	EP
2019-12-04	Intention to grant announcedINTG	INTG	EP
2019-11-04	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOSNIGR1GRAP	GRAP	EP
2019-11-04	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: GRANT OF PATENT IS INTENDEDSTAA	STAA	EP
2019-10-30	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2019-10-30	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2019-10-30	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2019-10-30	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2019-10-30	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2019-09-26	Amendment of ipc main classPREVIOUS MAIN CLASS: H02P0006180000R079	R079	DE
2017-02-22	Designation fees paidAKX	AKX	EP
2017-02-22	Extension fees paidAXX	AXX	EP
2017-02-22	Extension fees paidAXX	AXX	EP
2017-02-22	Extension fees paidAXX	AXX	EP
2017-02-22	Extension fees paidAXX	AXX	EP
2017-01-25	Request for examination filed17P	17P	EP
2017-01-25	Designated contracting states (corrected)RBV	RBV	EP
2016-12-23	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: REQUEST FOR EXAMINATION WAS MADESTAA	STAA	EP
2016-06-15	Designated contracting statesAK	AK	EP
2016-06-15	Request for extension of the european patentAX	AX	EP
2016-06-15	Information provided on ipc code assigned before grantRIC1	RIC1	EP
2016-05-13	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL	EP
2009-12-30	Party data changed (applicant data changed or rights of an application transferred)RAP1	RAP1	EP
2008-07-09	Designated contracting statesAK	AK	EP
2008-07-09	Request for extension of the european patentAX	AX	EP
2008-06-06	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI	EP

Method and apparatus for driving a DC motor

Abstract

Term

Priority claims5

Members11

Over the term

Events

Numbers

Titles3

Classification

Designated states2