LINEAR MOTOR WITH CAPACITIVE POWER TRANSFER
Disclosed is a linear motor with improved capacitive power transfer from the stator to the shuttle of the motor. The linear motor comprises a capacitive power transfer arrangement with a power transfer capacitor with a power transfer air gap as dielectric in between a primary electrode and a secondary electrode, wherein the motor air gap of the linear motor and the power transfer air gap are parallel and are arranged in transverse direction next to each other.
1 . Linear motor having a stator and at least one shuttle movable along the stator in a direction of movement, wherein;
drive magnets are arranged along the stator in direction of movement and a number of drive coils are arranged on the at least one shuttle or drive magnets are arranged on the shuttle and a number of drive coils are arranged along the stator in direction of movement,
the drive magnets and the number of drive coils face each other and are separated in a normal direction by a motor air gap with a motor air gap distance in the normal direction,
the motor air gap extends in direction of movement and in a transverse direction that is normal on the direction of movement and the normal direction,
a capacitive power transfer arrangement is provided in the linear motor, the capacitive power transfer arrangement comprising at least one primary electrode arranged on the stator and extending in direction of movement and further comprising at least one secondary electrode arranged on the shuttle, the at least one secondary electrode facing the at least one primary electrode and being arranged in the normal direction opposite the at least one primary electrode,
the at least one primary electrode and the at least one secondary electrode are separated in the normal direction by a power transfer air gap with a power transfer air gap distance,
the power transfer air gap extends in direction of movement and in transverse direction,
the at least one primary electrode and the at least one secondary electrode form a power transfer capacitor with the power transfer air gap as dielectric for capacitive power transfer configured to transfer electrical energy from the stator to the shuttle, and
the motor air gap and the power transfer air gap are parallel and are arranged in transverse direction next to each other.
2 . The linear motor according to claim 1 , wherein:
at least one primary electrode is arranged in transverse direction on each side of the drive magnets or drive coils on the stator, in that at least one secondary electrode is arranged in transverse direction on each side of the drive coils or drive magnets on the shuttle, and
the at least one primary electrode on each side is coupled to the at least one secondary electrode on each side to form in each case a power transfer capacitor.
3 . The linear motor according to claim 1 , wherein:
two primary electrodes are arranged in transverse direction on one side of the drive magnets or drive coils on the stator,
two secondary electrodes are arranged in transverse direction on the same side than the primary electrodes, and
each one of the primary electrodes is coupled to one of the secondary electrodes to form in each case a power transfer capacitor.
4 . The linear motor according to claim 2 , wherein both power transfer capacitors are used in the capacitive power transfer arrangement for capacitive power transfer.
5 . The linear motor according to claim 2 , wherein a first one of the power transfer capacitors is used for capacitive power transfer and a second one of the power transfer capacitors is used for capacitive data communication between a first data communication unit connected to the primary electrode of second power transfer capacitor and a second data communication unit connected to the secondary electrode of the second power transfer capacitor.
6 . The linear motor according to claim 1 , wherein an additional primary electrode is arranged on the stator of the linear motor and an additional secondary electrode is arranged on the at least one shuttle of the linear motor, the additional primary electrode and additional secondary electrode forming an additional power transfer capacitor that is configured to provide capacitive data communication between a first data communication unit connected to the additional primary electrode of the additional power transfer capacitor and a second data communication unit connected to the additional secondary electrode of the additional power transfer capacitor.
7 . The linear motor according to claim 6 , wherein:
the additional secondary electrode faces the additional primary electrode and is arranged in the normal direction opposite the additional primary electrode,
the additional primary electrode and the additional secondary electrode are separated by an additional air gap with an additional air gap distance in the normal direction,
the additional air gap extends in direction of movement and in transverse direction,
the additional primary electrode and the additional secondary electrode form the additional capacitor with the additional air gap as dielectric, and
the motor air gap and the additional air gap are parallel and are arranged in transverse direction next to each other.
8 . The linear motor according to claim 1 , wherein the power transfer capacitor formed by at least one primary electrode and the associated at least one secondary electrode is additionally configured to provide capacitive power transfer between a first data communication unit connected to the at least one primary electrode of the power transfer capacitor and a second data communication unit connected to the at least one secondary electrode of the power transfer capacitor.
9 . The linear motor according to claim 1 , wherein the capacitive power transfer arrangement is provided in the normal direction on both sides of the at least one shuttle and with a stator provided in the normal direction on both sides of the at least one shuttle.
10 . The linear motor according to claim 1 , wherein the stator comprises at least one bend in which the stator is bent around the normal direction.
11 . The linear motor according to claim 1 , wherein the stator comprises at least one bend in which the stator is bent around the transverse direction.
12 . The linear motor according to claim 3 , wherein both power transfer capacitors are used in the capacitive power transfer arrangement for capacitive power transfer.
13 . The linear motor according to claim 3 , wherein a first one of the power transfer capacitors is used for capacitive power transfer and a second one of the power transfer capacitors is used for capacitive data communication between a first data communication unit connected to the primary electrode of second power transfer capacitor and a second data communication unit connected to the secondary electrode of the second power transfer capacitor.
14 . The linear motor according to claim 2 , wherein an additional primary electrode is arranged on the stator of the linear motor and an additional secondary electrode is arranged on the at least one shuttle of the linear motor, the additional primary electrode and additional secondary electrode forming an additional power transfer capacitor that is configured to provide capacitive data communication between a first data communication unit connected to the additional primary electrode of the additional power transfer capacitor and a second data communication unit connected to the additional secondary electrode of the additional power transfer capacitor.
15 . The linear motor according to claim 14 , wherein:
the additional secondary electrode faces the additional primary electrode and is arranged in the normal direction opposite the additional primary electrode,
the additional primary electrode and the additional secondary electrode are separated by an additional air gap with an additional air gap distance in the normal direction,
the additional air gap extends in direction of movement and in transverse direction,
the additional primary electrode and the additional secondary electrode form the additional capacitor with the additional air gap as dielectric, and
the motor air gap and the additional air gap are parallel and are arranged in transverse direction next to each other.
16 . The linear motor according to claim 15 , wherein the capacitive power transfer arrangement is provided in the normal direction on both sides of the at least one shuttle and with a stator provided in the normal direction on both sides of the at least one shuttle.
17 . The linear motor according to claim 16 , wherein the stator comprises at least one bend in which the stator is bent around the normal direction.
18 . The linear motor according to claim 3 , wherein an additional primary electrode is arranged on the stator of the linear motor and an additional secondary electrode is arranged on the at least one shuttle of the linear motor, the additional primary electrode and additional secondary electrode forming an additional power transfer capacitor that is configured to provide capacitive data communication between a first data communication unit connected to the additional primary electrode of the additional power transfer capacitor and a second data communication unit connected to the additional secondary electrode of the additional power transfer capacitor.
19 . The linear motor according to claim 18 , wherein:
the additional secondary electrode faces the additional primary electrode and is arranged in the normal direction opposite the additional primary electrode,
the additional primary electrode and the additional secondary electrode are separated by an additional air gap with an additional air gap distance in the normal direction,
the additional air gap extends in direction of movement and in transverse direction,
the additional primary electrode and the additional secondary electrode form the additional capacitor with the additional air gap as dielectric, and
the motor air gap and the additional air gap are parallel and are arranged in transverse direction next to each other.
20 . The linear motor according to claim 19 , wherein the capacitive power transfer arrangement is provided in the normal direction on both sides of the at least one shuttle and with a stator provided in the normal direction on both sides of the at least one shuttle, and wherein the stator comprises at least one bend in which the stator is bent around the normal direction.