Current sensor
A current sensor includes: a magnetic core member including a core main body obtained by forming a slit-shaped gap portion along a tube axis direction in a tube that surrounds a conductive member, which is an object to be energized, on an inner side with a clearance, the magnetic core member being configured to generate a magnetic flux corresponding to a current flowing through the conductive member; a magnetic sensor configured to output a signal corresponding to magnetic flux density in the gap portion; and a magnetic shield member including a shield main body that surrounds the core main body from an outer side of the core main body with a clearance, the magnetic shield member being configured to block magnetism between inside and outside of the shield main body by the shield main body.
1. A current sensor, comprising:
a magnetic core member including a core main body obtained by forming a slit-shaped gap portion along a tube axis direction in a tube that surrounds a conductive member, which is an object to be energized, on an inner side with a clearance, the magnetic core member being configured to generate a magnetic flux corresponding to a current flowing through the conductive member;
a magnetic sensor configured to output a signal corresponding to magnetic flux density in the gap portion;
a magnetic shield member including a shield main body that surrounds the core main body from an outer side of the core main body with a clearance, the magnetic shield member being configured to block magnetism between inside and outside of the shield main body by the shield main body; and
a sensor housing member housing the magnetic core member, the magnetic sensor, and the magnetic shield member,
wherein the sensor housing member includes:
a housing chamber housing the magnetic core member, the magnetic sensor, and the magnetic shield member; and
a positioning and holding mechanism holding the magnetic core member and the magnetic shield member with a clearance between the magnetic core member and the magnetic shield member, and
wherein the positioning and holding mechanism includes:
a core position regulating portion configured to regulate a relative position of the magnetic core member in the housing chamber from an inner side of the magnetic core member; and
shield holding portions formed as ribs that extend from a surface of the housing chamber and that are configured to sandwich the magnetic shield member from an outer side of the magnetic shield member in order to fix a relative position of the magnetic shield member in the housing chamber.
2. The current sensor according to claim 1 , wherein the positioning and holding mechanism includes:
a shield position regulating portion configured to regulate the relative position of the magnetic shield member in the housing chamber in a direction intersecting a sandwiching direction of the shield holding portions.
3. The current sensor according to claim 1 , wherein in an alternate current circuit including a plurality of the conductive members, a combination of the magnetic core member, the magnetic sensor, and the magnetic shield member is provided for each of the conductive members.
4. The current sensor according to claim 2 , wherein in an alternate current circuit including a plurality of the conductive members, a combination of the magnetic core member, the magnetic sensor, and the magnetic shield member is provided for each of the conductive members.
5. The current sensor according to claim 1 , wherein the magnetic sensor is a Hall IC including a Hall element as a magnetic detection element.
6. The current sensor according to claim 2 , wherein the magnetic sensor is a Hall IC including a Hall element as a magnetic detection element.
7. The current sensor according to claim 3 , wherein the magnetic sensor is a Hall IC including a Hall element as a magnetic detection element.
8. The current sensor according to claim 4 , wherein the magnetic sensor is a Hall IC including a Hall element as a magnetic detection element.