# US 2014/0151145 A1 · Two-phase motor and hydraulic power steering system using the two-phase motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0151145 A1 - Document ID: US20140151145A1 - Status: Published application - Kind: A1 - Application number: 14/087,317 - Filed: 2013-11-22 - Published: 2014-06-05 - Earliest claimed: 2012-12-03 - Assignees: Jtekt Corporation - Applicants: Jtekt Corporation - Inventors: Masahiko SAKAMAKI - Web page: https://patentgrep.com/patent/US20140151145A1 ## CPC - B62D 5/091: {Hydraulic steer-by-wire systems, e.g. the valve being actuated by an electric motor} - H02K 1/12: Stationary parts of the magnetic circuit - H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) - H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20) - H02K 29/00: Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A two-phase motor with high space utilization efficiency is provided for driving a hydraulic control valve. A valve drive motor includes a rotor and a stator surrounding the rotor. The rotor has six magnetic poles. The stator includes six stator windings. The U-phase first stator winding and the V-phase first stator winding constitute a pair of two-phase stator windings. The U-phase second stator winding and the V-phase second stator winding constitute a pair of two-phase stator windings. The U-phase third stator winding and the V-phase third stator winding constitute a pair of two-phase stator windings. The two stator windings of each pair are disposed at an angular interval of 180 degrees in terms of an electrical angle. ## Claims ### Claim 1 A two-phase motor comprising: a stator including a series circuit formed of a first-phase stator winding and a second-phase stator winding; and a rotor that is opposed to the stator, and has a plurality of magnetic poles, wherein the first-phase stator winding and the second-phase stator winding are disposed at an interval of 180 degrees in terms of an electrical angle, and the two-phase motor is used in a state where a rotation angle range of the rotor is limited to below 180 degrees in terms of the electrical angle. ### Claim 2 (depends on 1) The two-phase motor according to claim 1, wherein the first-phase stator winding and the second-phase stator winding are connected in series such that a winding direction of the first-phase stator winding and a winding direction of the second-phase stator winding are opposite to each other when viewed from either one of terminals of the series circuit. ### Claim 3 (depends on 1) The two-phase motor according to claim 1, wherein the rotor has 2n magnetic poles and the stator has 2n stator windings, the n denoting an arbitrary natural number. ### Claim 4 (depends on 2) The two-phase motor according to claim 2, wherein the rotor has 2n magnetic poles and the stator has 2n stator windings, the n denoting an arbitrary natural number. ### Claim 5 (depends on 1) A hydraulic power steering system comprising: the two-phase motor according to claim 1 used as a valve drive motor that controls an opening of a hydraulic control valve; and a motor control unit that controls the valve drive motor, wherein in the power steering system, a steering force is assisted by supplying a hydraulic fluid from a hydraulic pump to a power cylinder connected to a vehicle steering mechanism, through the hydraulic control valve that is not mechanically connected to a steering member. ### Claim 6 (depends on 2) A hydraulic power steering system comprising: the two-phase motor according to claim 2 used as a valve drive motor that controls an opening of a hydraulic control valve; and a motor control unit that controls the valve drive motor, wherein in the power steering system, a steering force is assisted by supplying a hydraulic fluid from a hydraulic pump to a power cylinder connected to a vehicle steering mechanism, through the hydraulic control valve that is not mechanically connected to a steering member. ### Claim 7 (depends on 3) A hydraulic power steering system comprising: the two-phase motor according to claim 3 used as a valve drive motor that controls an opening of a hydraulic control valve; and a motor control unit that controls the valve drive motor, wherein in the power steering system, a steering force is assisted by supplying a hydraulic fluid from a hydraulic pump to a power cylinder connected to a vehicle steering mechanism, through the hydraulic control valve that is not mechanically connected to a steering member. ### Claim 8 (depends on 4) A hydraulic power steering system comprising: the two-phase motor according to claim 4 used as a valve drive motor that controls an opening of a hydraulic control valve; and a motor control unit that controls the valve drive motor, wherein in the power steering system, a steering force is assisted by supplying a hydraulic fluid from a hydraulic pump to a power cylinder connected to a vehicle steering mechanism, through the hydraulic control valve that is not mechanically connected to a steering member. ### Claim 9 (depends on 5) The hydraulic power steering system according to claim 5, wherein the motor control unit includes: an opening command value setter that sets an opening command value that is a command value of the opening of the hydraulic control valve; and a unit that controls the valve drive motor according to the opening command value set by the opening command value setter. ### Claim 10 (depends on 6) The hydraulic power steering system according to claim 6, wherein the motor control unit includes: an opening command value setter that sets an opening command value that is a command value of the opening of the hydraulic control valve; and a unit that controls the valve drive motor according to the opening command value set by the opening command value setter. ### Claim 11 (depends on 7) The hydraulic power steering system according to claim 7, wherein the motor control unit includes: an opening command value setter that sets an opening command value that is a command value of the opening of the hydraulic control valve; and a unit that controls the valve drive motor according to the opening command value set by the opening command value setter. ### Claim 12 (depends on 8) The hydraulic power steering system according to claim 8, wherein the motor control unit includes: an opening command value setter that sets an opening command value that is a command value of the opening of the hydraulic control valve; and a unit that controls the valve drive motor according to the opening command value set by the opening command value setter.