LINEAR STEPPING MOTOR
First Claim
1. A linear stepping motor comprising:
- a plate-shaped stator having a plurality of teeth symmetrically formed on upper and lower surfaces thereof at regular pitch;
a movable member which includes a plurality of upper cores disposed above the stator, a plurality of lower cores disposed below the stator in symmetrical with the upper cores, and yoke parts connecting the upper and the lower cores around the stator, wherein the upper and lower cores have upper and lower coils individually wound around thereof, respectively;
at least one non-contact type gap sensor to detect the gap between the stator and the upper or lower core;
a controller calculating voltages for levitation and linear movement of the movable member, based on the gap variation; and
a multi-channel voltage-to-current power amplifier having a plurality of channels, each channel being connected to each coil of the upper and lower cores, respectively,thereby achieving an independent levitation of the movable member and linear driving of the linear motor.
1 Assignment
0 Petitions
Accused Products
Abstract
A linear motor includes a stator having teeth symmetrically formed on upper and lower surfaces thereof at regular pitch; a movable member including upper cores disposed above the stator, lower cores disposed below the stator in symmetrical with the upper cores, and yoke parts connecting the upper and the lower cores around the stator, wherein the upper and lower cores have upper and lower coils wound therearound, respectively; at least one gap sensor to detect the gap between the stator and the upper or lower core and the inclination of the movable member; a controller performing the levitation control by adjusting the amplitudes of currents applied to the upper and lower coils, based on the gap variation, and driving the linear motion by changing the current phases; and a multichannel voltage-to-current power amplifier of which each channel is connected to each coil of the upper and lower cores.
9 Citations
5 Claims
-
1. A linear stepping motor comprising:
-
a plate-shaped stator having a plurality of teeth symmetrically formed on upper and lower surfaces thereof at regular pitch; a movable member which includes a plurality of upper cores disposed above the stator, a plurality of lower cores disposed below the stator in symmetrical with the upper cores, and yoke parts connecting the upper and the lower cores around the stator, wherein the upper and lower cores have upper and lower coils individually wound around thereof, respectively; at least one non-contact type gap sensor to detect the gap between the stator and the upper or lower core; a controller calculating voltages for levitation and linear movement of the movable member, based on the gap variation; and a multi-channel voltage-to-current power amplifier having a plurality of channels, each channel being connected to each coil of the upper and lower cores, respectively, thereby achieving an independent levitation of the movable member and linear driving of the linear motor. - View Dependent Claims (2, 3, 4, 5)
-
Specification
-
- Resources
-
Current AssigneeKorea Advanced Institute of Science and Technology
-
Original AssigneeKorea Advanced Institute of Science and Technology
-
InventorsKIM, Seung-Jong, KIM, Woo Yeon, LEE, Jong Min
-
Granted Patent
-
Time in Patent OfficeDays
-
Field of Search
-
US Class Current318/135
-
CPC Class CodesH02K 2201/18 Machines moving with multip...H02K 41/03 Synchronous motors; Motors ...H02K 7/09 with magnetic bearings
