Device and method for driving a door

• US 9,534,882 B2
• Filed: 03/20/2012
• Issued: 01/03/2017
• Est. Priority Date: 04/14/2011
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Ludwig, Heinz, Nolte, Uwe, Sonntag, Guido
• Primary Examiner(s): Santana, Eduardo Colon
• Assistant Examiner(s): COOK, CORTEZ M
• Application Number:
  US14/111,723
• Publication Number:
  US 20140035506A1
• Time in Patent Office: 1,750 Days
• US Class Current: 1/1
• CPC Class Codes: E05F 15/603 using rotary electromotors
• CPC Class Codes: E05F 15/632 for horizontally-sliding wings
• CPC Class Codes: E05F 15/643 operated by flexible elongated pulling elements, e.g. belts, chains or cables by flexible elongated push-pull mechanisms E05F15/635
• CPC Class Codes: E05Y 2400/336 of the angular type
• CPC Class Codes: E05Y 2400/452 for saving energy, e.g. sleep or wake-up
• CPC Class Codes: E05Y 2400/61 Power supply
• CPC Class Codes: E05Y 2400/612 Batteries
• CPC Class Codes: E05Y 2800/00 Details, accessories and auxiliary operations not otherwise provided for
• CPC Class Codes: E05Y 2800/40 Physical or chemical protection
• CPC Class Codes: E05Y 2900/132 Doors
• CPC Class Codes: G01B 7/003 for measuring position, not involving coordinate determination coordinate measuring G01B7/004
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14

Abstract

To improve the energy efficiency of electrical drive systems for doors, the electric motor is actuated position-dependently, the electrically driven door is disconnected from the supply network in a resting position, a change of position of the door performed in the state of being disconnected from the grid is detected by a position encoder unit that is independently supplied with power by an energy store, and the change of position is used for position-dependently actuating the electric motor after the supply voltage has been reapplied.

Claims

1. An electrical drive system for a door, comprising:

a power supply unit for supplying the electrical drive system with power from an electricity supply grid;

an electric motor configured to drive the door between first and second end positions;

a position encoder configured to determine a current position of the door, including an encoder determining an electrical measurement variable representing an angular position of the rotor of the electrical motor;

a control device controlling position-dependent actuation of the electric motor;

a switching device configured to automatically disconnect the electrical drive system, from the electricity supply grid while the door is in idles state;

an energy store independently supplying the position encoder with power, the energy store being dimensioned such that changes in the position of the door during a disconnection of the drive system from the electricity supply grid can be detected by the position encoder;

and sampling means, included in the electrical drive system, for determining a sampling frequency as a function of a current rotor angular velocity, so that the sampling frequency ensures at least two angular position measurements of the rotor are performed within one complete revolution of the rotor and the sampling frequency increases as angular velocity of the rotor increases.

2. The electrical drive system as claimed in claim 1, wherein the position encoder unit comprises a processor programmed to serially evaluate the electrical measurement variable and determine the current position of the door.

3. The electrical drive system as claimed in claim 2, further comprising:

means for measuring an amount of energy in the energy store, and

means for automatically connecting the electricity supply grid to the electrical drive system when the amount of energy available for determining the position is inadequate.

4. A door with an electrical drive system, the electrical drive system comprising:

a power supply unit for supplying the electrical drive system with power from an electricity supply grid;

an electric motor configured to drive the door between first and second end positions;

a position encoder configured to determine a current position of the door, including an encoder determining en electrical measurement variable representing an angular position of the rotor of the electrical motor;

a control device controlling position-dependent actuation of the electric motor;

a switching device configured to automatically disconnect the electrical drive system, from the electricity supply grid while the door is in idles state;

an energy store independently supplying the position encoder with power, the energy store being dimensioned such that changes in the position of the door during a disconnection of the drive system from the electricity supply grid can be detected by the position encoder; and

sampling means, included in the electrical drive system, for determining a sampling frequency as a function of a current rotor angular velocity, so that the sampling frequency ensures at least two angular position measurements of the rotor are performed within one complete revolution of the rotor and the sampling frequency increases as angular velocity of the rotor increases.

5. A method for operating an electrically driven door in which the door is moved between first and second end positions by an electric motor, comprising:

determining a sampling frequency as a function of a current rotor angular velocity, the sampling frequency ensuring that at least two angular position measurements of the rotor are performed within one complete revolution of the rotor and the sampling frequency increases as the rotor angular velocity increases;

automatically disconnecting the electrically driven door from an electricity supply grid when the door is in an idle state;

detecting a change in position of the door, while the electrically driven door is disconnected from the electricity supply grid, using a position encoder unit, independently supplied with power by an energy store, configured to determine an electrical measurement variable representing an angular position of a rotor of the electrical motor;

responsive to a user command, reconnecting the electrically driven door to the electricity supply grid; and

actuating the electric motor as a function of position after the electricity supply grid voltage is reconnected.

6. The method as claimed in claim 5, wherein the electricity supply grid is connected to the drive system automatically when a command for opening or closing the door is received and the drive system is automatically disconnected from the electricity supply grid when the opening or closing of the door is terminated.