Method and apparatus for determining an operating point of a work machine
First Claim
1. A method for determining an operating point of a work machine or of an asynchronous motor driving the such a machine, whereinthe operating point is characterized by a power input of the work machine or by a delivery rate of the work machine;
- one or more operating point-dependent measurement variables of the work machine are detected by one or more sensors;
measured values of the variables are evaluated or stored while the work machine is in operation; and
the operating point is determined without the use of electrical measurement variables of the asynchronous drive motor;
said method comprising;
determining a frequency linearly proportional to the rotational sound of the work machine by signal analysis of a measured mechanical variable selected from the group consisting of pressure, differential pressure, force, vibration, solid-borne noise, and airborne noise;
determining the rotational speed (n) of the drive machine from said frequency; and
determining the operating point from the slip-induced rotational speed/torque dependence of the asynchronous motor.
1 Assignment
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Accused Products
Abstract
Method and apparatus for determining an operating point of a work machine and/or asynchronous motor driving the same, the operating point being characterized by the power consumed by and/or output rate of the machine, in which one or more operating point-dependent measurement variables of the machine are detected by sensors, and the measured values are evaluated and/or stored during operation of the machine. The operating point is determined without using electric measurement variables of the motor by determining a frequency linearly proportional to the fundamental tone of the machine through signal analysis, especially frequency analysis of a measured mechanical variable selected from pressure, differential pressure, power, vibration, and solid-borne or air-borne sound. From this, the rotational speed of the driving machine is determined, and the operating point characterized by the power consumed by and/or output rate of the machine is determined utilizing the rotational speed/torque relationship of the motor.
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Citations
20 Claims
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1. A method for determining an operating point of a work machine or of an asynchronous motor driving the such a machine, wherein
the operating point is characterized by a power input of the work machine or by a delivery rate of the work machine; -
one or more operating point-dependent measurement variables of the work machine are detected by one or more sensors; measured values of the variables are evaluated or stored while the work machine is in operation; and the operating point is determined without the use of electrical measurement variables of the asynchronous drive motor; said method comprising; determining a frequency linearly proportional to the rotational sound of the work machine by signal analysis of a measured mechanical variable selected from the group consisting of pressure, differential pressure, force, vibration, solid-borne noise, and airborne noise; determining the rotational speed (n) of the drive machine from said frequency; and determining the operating point from the slip-induced rotational speed/torque dependence of the asynchronous motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for determining or monitoring an operating point of a work machine or an asynchronous motor driving a work machine, wherein
said operating point is characterized by a power input of the work machine or a delivery rate of the work machine; -
said apparatus comprises at least one input for detection of operating point-dependent measurement variables, and a data store for storing technological data of the work machine or the asynchronous motor driving the work machine; and wherein said apparatus determines a frequency linearly proportional to the rotational sound of the work machine through signal analysis of a measured mechanical variable selected from the group consisting of pressure, differential pressure, force, vibration, solid-borne noise and airborne noise; determines the rotational speed (n) of the drive machine from the determined frequency, and determines, and optionally monitors, the operating point from non-electrical measurement variables and from the slip-induced rotational speed/torque dependence of the asynchronous motor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification