Window covering motorized lift and control system motor and operation
View Patent ↗A motorized lift assembly for a window covering includes movable window covering material and cords for moving the window covering material, the motorized lift assembly includes a motor assembly including a motor, a speed reducing gear train driven by the motor for adjusting positions of the cords, and the motor being a low voltage, high speed motor operating at greater than 12,000 rpm.
1. A motorized lift assembly for a window covering having movable window covering material and cords for moving the window covering material, the motorized lift assembly comprising:
a motor assembly including a motor;
a speed reducing gear train driven by the motor for adjusting positions of the cords; and
the motor being a low voltage, high speed motor operating at greater than 12,000 rpm.
2. The motorized lift assembly of claim 1 , the motor operating at greater than 15,000 rpm.
3. The motorized lift assembly of claim 1 , including an encoder sensing the performance of the low voltage, high speed motor.
4. The motorized lift assembly 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 motorized lift assembly of claim 4 , the motor having a motor shaft and the magnet being an annular magnet mounted on the motor shaft.
6. The motorized lift assembly of claim 5 , including a magnet insert compressed between the annular magnet and the motor shaft.
7. The motorized lift assembly of claim 6 , including first and second Hall sensors outwardly of the annular magnet.
8. The motorized lift assembly 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 motorized lift assembly of claim 1 , further comprising a magnetic encoder sensing an output from the high-speed motor.
10. The motorized lift assembly of claim 9 , the magnetic encoder including a magnet and metallic bodies influencing the position of the magnet with the motor at rest.
11. The motorized lift assembly of claim 10 , the magnet being annular and held on the motor shaft by a compression insert.
12. The motorized lift assembly of claim 1 , including position sensors determining the position of the window covering material.
13. The motorized lift assembly of claim 1 , further comprising:
an encoder sensing actual output from the motor, the encoder providing resistance to unintended rotation of the motor when not operating.
14. The motorized lift assembly of claim 13 , 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.
15. The motorized lift assembly of claim 14 , including metallic posts influencing the at rest position of the magnet.