Method and a door drive unit for defining tension of a belt of an automatic door
AssigneeKone Corporation
InventorsMatti Mustonen, Markku Jokinen
Life of this patent
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Abstract
A method for defining a tension of a belt of an automatic door includes exciting a resonant frequency of the belt to cause a vibration of the belt, obtaining motion data representing motion of an electric motor that moves the belt, defining vibration information representing the vibration of the belt based on the obtained motion data, and defining the tension of the belt based on the defined vibration in-formation and predefined characteristics of the belt. The method may be performed by a door drive unit and a computer program for defining a tension of a belt of an automatic door.
Claims15
A method for defining a tension of a belt of an automatic door by a control unit of a door drive unit, the method comprising the control unit:
- exciting a resonant frequency of the belt to cause a vibration of the belt;
- obtaining motion data representing motion of an electric motor configured to move the belt;
- defining vibration information representing the vibration of the belt based on the obtained motion data;
- and
- defining the tension of the belt based on the defined vibration information and predefined characteristics of the belt,
- wherein the exciting the resonant frequency of the belt comprises providing a drive signal to the electric motor to control the electric motor to move the belt according to a position reference of the electric motor, a speed reference of the electric motor, or a torque reference of the electric motor, with a pseudo-random-binary signal comprising a plurality of frequencies including the resonant frequency of the belt added to the drive signal.
A door drive unit for defining a tension of a belt of an automatic door, the door drive unit including a control unit comprising:
- at least one processor;
- and
- at least one memory storing at least one portion of computer program code,
- wherein the at least one processor being configured, based on the at least one portion of computer program code, to cause the control unit to
- excite a resonant frequency of the belt to cause a vibration of the belt,
- obtain motion data representing motion of an electric motor configured to move the belt,
- define vibration information representing the vibration of the belt based on the obtained motion data, and
- define the tension of the belt based on the defined vibration information and predefined characteristics of the belt,
- wherein the control unit is configured to excite the resonant frequency of the belt by providing a drive signal to the electric motor to control the electric motor to move the belt according to a position reference of the electric motor, a speed reference of the electric motor, or a torque reference of the electric motor, with a pseudo-random-binary signal comprising a plurality of frequencies including the resonant frequency of the belt added to the drive signal.
Dependencies are inferred from the claim text.