Window covering motorized lift and control system motor and operation
A motorized lift assembly for a window covering includes a movable window covering material and cords for moving the window covering material. The motorized lift assembly also includes a motor assembly including a motor, a speed reducing gear train driven by said motor for adjusting positions of said cords, where the motor is a low voltage, high speed motor operating at greater than 12,000 rpm.
1. A window covering comprising:
a window covering material configured to selectively cover an architectural opening;
a head rail configured to extend within the architectural opening;
a motorized lift assembly positioned within the head rail, the motorized lift assembly including a low voltage, high speed motor operating at greater than 12,000 rpm and a speed reducing gear train with a plurality of planetary gear stages, wherein the low voltage, high speed motor is axially aligned with the speed reducing gear train; and
a take-up shaft positioned within the head rail, operably connected to the motorized lift assembly, and coupled to the moveable window covering material,
wherein the motorized lift assembly is configured to rotate the take-up shaft to adjust a position of the window covering material within the architectural opening.
2. The window covering of claim 1 , further comprising the low voltage, high speed motor operating at greater than 15,000 rpm.
3. The window covering of claim 1 , including an encoder sensing the position of a motor shaft of the low voltage, high speed motor.
4. The window covering of claim 3 , the encoder being a magnetic field sensing encoder including a rotating magnet and sensors of the changing magnetic field when the magnet rotates.
5. The window covering of claim 4 , the low voltage, high speed motor having a motor shaft, and the magnet being an annular magnet mounted on the motor shaft.
6. The window covering of claim 5 , including a magnet insert compressed between the annular magnet and the motor shaft.
7. The window covering of claim 6 , including a first Hall sensor and a second Hall sensor are positioned radially outwardly of the annular magnet.
8. The window covering of claim 7 , including metallic bodies on opposite sides of the annular magnet operating with the annular magnet to resist unintended rotation of the motor shaft.
9. The window covering of claim 1 , wherein the take-up shaft is coupled to the moveable window covering material by a plurality of lift cords.
10. A window covering comprising:
an elongated head rail configured to extend within an architectural opening, the head rail containing a motorized lift assembly and a take-up shaft, the motorized lift assembly drivingly connected to the take-up shaft, the motorized lift assembly including:
a motor operating at more than 12,000 rpm; and
a speed reducing gear train driven by the motor, the speed reducing gear train including a plurality of planetary gear stages and an output shaft,
wherein the speed reducing gear train is positioned between and axially aligned with the motor and the output shaft, and
a window covering material coupled to the take-up shaft, wherein in response to rotation of the take-up shaft by the motorized lift assembly, the window covering material moves to selectively cover the architectural opening.
11. The window covering of claim 10 , further comprising an encoder affixed to the motor by a first metallic fastener and a second metallic fastener, the first metallic fastener and the second metallic fastener positioned on opposing sides of a motor shaft driven by the motor.
12. The window covering of claim 11 , further comprising a magnet fastened to the motor shaft, the first metallic fastener and the second metallic fastener influencing the position of the magnet with the motor at rest.
13. The window covering of claim 12 , the magnet being annular and held on the motor shaft by a compression insert.
14. The window covering of claim 10 , the motorized lift assembly including:
a driveshaft operably connected to the output shaft, the driveshaft positioned parallel to the output shaft, and the driveshaft drivingly coupled to the take-up shaft.
15. The window covering of claim 14 , wherein the driveshaft is offset from the output shaft.
16. The window covering of claim 10 , further comprising at least one cord coupled to the take-up shaft, wherein in response to rotation of the take-up shaft in a first direction by the motorized lift assembly, the at least one cord is wound about the take-up shaft raising the window covering material relative to the architectural opening, and wherein in response to rotation of the take-up shaft in a second direction, opposite the first direction, by the motorized lift assembly, the at least one cord is unwound about the take-up shaft lowering the window covering material relative to the architectural opening.
17. A window covering comprising:
a head rail positioned within an architectural opening;
a motorized lift assembly positioned within the head rail, the motorized lift assembly including a high speed motor with a motor shaft, the high speed motor operating at greater than 12,000 rpm, a speed reducing gear train coupled to the motor shaft, the speed reducing gear train including a plurality of planetary gear stages, an encoder sensing the position of the motor shaft;
a take-up shaft positioned within the head rail, the take-up shaft driven by the motorized lift assembly; and
a window covering material configured to selectively cover an architectural opening, the window covering material operably connected to the take-up shaft,
wherein the take-up shaft rotates in response to rotation of the speed reducing gear train, which is driven by the motor shaft of the high speed motor, and the window covering material moves relative to the architectural opening in response to rotation of the take-up shaft.
18. The window covering of claim 17 , the encoder including a magnet rotating with a motor shaft of the motor, and sensors determining the changing magnetic field upon rotation of the magnet.
19. The window covering of claim 18 , including metallic posts influencing the at rest position of the magnet, providing resistance to unintended rotation of the motor shaft.
20. The window covering of claim 17 , the motor operating at greater than 15,000 rpm.