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US 2013/0293172 A1Published application
Motor with magnetic sensors
AssigneeSntech, Inc.
InventorYOUNG-CHUN JEUNG
Life of this patent
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Abstract
Disclosed is an electric motor that includes a stator with a plurality of main poles, each of which includes a coil, and a rotor rotatable about an axis and having a magnet with magnetic poles in which N and S poles are alternating. The motor further includes a first sensor group of a plurality of magnetic sensors fixed relative to the stator, and a second sensor group of a plurality of magnetic sensors fixed relative to the stator. When operating the motor, the first sensor group can be selected so as to rotate the rotor in a first direction. The second sensor group can be selected so as to rotate the rotor in a second direction opposite to the first direction.
Claims13
A method of operating a two-phase electric motor, the method comprising:
- providing a two-phase electric motor comprising:
- a stator comprising a plurality of main poles, which comprise a first phase pole with a first coil and a second phase pole with a second coil,
- a rotor rotatable about an axis and comprising a rotor magnet, which comprises a plurality of magnetic poles in which N and S poles are alternating,
- a first sensor group comprising first and second sensors, each of which is configured to monitor magnetic polarity of a portion of the rotor magnet passing by itself while the rotor rotates in a first direction, and
- a second sensor group comprising third and fourth sensors, each of which is configured to monitor magnetic polarity of a portion of the rotor magnet passing by itself while the rotor rotates in a second direction opposite to the first direction;
- detecting changes of magnetic polarity of the rotor magnet passing by the first sensor while the rotor rotates in the first direction;
- detecting changes of magnetic polarity of the rotor magnet passing by the second sensor while the rotor rotates in the first direction;
- detecting changes of magnetic polarity of the rotor magnet passing by the third sensor while the rotor rotates in the second direction;
- detecting changes of magnetic polarity of the rotor magnet passing by the fourth sensor while the rotor rotates in the second direction;
- controlling current flow in the first and second coils based at least in part on changes of magnetic polarity of the rotor magnet passing by the first, second, third and fourth sensors;
- and
- wherein controlling comprises switching current flow directions in the first coil in synchronization with the changes of magnetic polarity passing by the first sensor while the rotor rotates in the first direction.
9 more elements
A two-phase electric motor comprising:
- a stator comprising a plurality of main poles, which comprises a first phase pole with a first coil and a second phase pole with a second coil;
- a rotor rotatable about an axis and comprising a magnet, which comprises a plurality of magnetic poles in which N and S poles are alternating;
- a first sensor group comprising first and second sensors, each of which is configured to monitor magnetic polarity of a portion of the rotor magnet passing by itself while the rotor rotates in a first direction;
- a second sensor group comprising third and fourth sensors, each of which is configured to monitor magnetic polarity of a portion of the rotor magnet passing by itself while the rotor rotates in a second direction opposite to the first direction;
- and
- one or more electric circuits configured to collectively:
- detect changes of magnetic polarity of the rotor magnet passing by the first sensor while the rotor rotates in the first direction,
- detect changes of magnetic polarity of the rotor magnet passing by the second sensor while the rotor rotates in the first direction,
- detect changes of magnetic polarity of the rotor magnet passing by the third sensor while the rotor rotates in the second direction,
- detect changes of magnetic polarity of the rotor magnet passing by the fourth sensor while the rotor rotates in the second direction,
- control current flow in the first and second coils based at least in part on changes of magnetic polarity of the rotor magnet passing by the first, second, third and fourth sensors, and
- wherein the electric circuit is further configured to switch current flow directions in the first coil in synchronization with the changes of magnetic polarity passing by the first sensor while the rotor rotates in the first direction.
9 more elements
Dependencies are inferred from the claim text.