Elevator position detection apparatus
First Claim
1. An elevator position detection apparatus comprising:
- a detection subject body; and
a sensor that detects presence of the detection subject body within a detection region,wherein the detection subject body is provided in one of an elevating body and a hoistway through which the elevating body moves in a vertical direction, and the sensor is provided in the other;
the sensor includes;
an excitation coil that applies an AC magnetic field to the detection subject body to cause the detection subject body to generate an eddy current magnetic field when the detection subject body is in the detection region,a diagnosis circuit that includes a diagnosis coil and a diagnosis switch unit, wherein the diagnosis coil generates an induced magnetic field in response to the AC magnetic field from the excitation coil when the diagnosis switch unit is closed,a measurement coil that outputs a measurement signal upon reception of the AC magnetic field from the excitation coil, and reduces an output value of the measurement signal in accordance with the generated magnetic field, when at least one of the eddy current magnetic field and the induced magnetic field are generated, anda processing unit that switches an operating mode of the sensor upon reception of a diagnosis signal, and outputs a detection signal in a different output condition depending on whether or not the output value of the measurement signal from the measurement coil is lower than a threshold.
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Accused Products
Abstract
In an elevator position detection apparatus, when a first diagnosis switch is closed, a diagnosis coil generates a first induced magnetic field, and when a second diagnosis switch is closed, the diagnosis coil generates a second induced magnetic field that is weaker than the first induced magnetic field. In a constant L output fault diagnosis mode in which the first induced magnetic field is generated, an output value of a measurement signal falls below a threshold regardless of whether or not a detection subject body is present in a detection region. In a constant H output fault diagnosis mode in which generation of both the first and the second induced magnetic fields is stopped, the output value of the measurement signal equals or exceeds the threshold regardless of whether or not the detection subject body is present in the detection region.
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Citations
7 Claims
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1. An elevator position detection apparatus comprising:
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a detection subject body; and a sensor that detects presence of the detection subject body within a detection region, wherein the detection subject body is provided in one of an elevating body and a hoistway through which the elevating body moves in a vertical direction, and the sensor is provided in the other; the sensor includes; an excitation coil that applies an AC magnetic field to the detection subject body to cause the detection subject body to generate an eddy current magnetic field when the detection subject body is in the detection region, a diagnosis circuit that includes a diagnosis coil and a diagnosis switch unit, wherein the diagnosis coil generates an induced magnetic field in response to the AC magnetic field from the excitation coil when the diagnosis switch unit is closed, a measurement coil that outputs a measurement signal upon reception of the AC magnetic field from the excitation coil, and reduces an output value of the measurement signal in accordance with the generated magnetic field, when at least one of the eddy current magnetic field and the induced magnetic field are generated, and a processing unit that switches an operating mode of the sensor upon reception of a diagnosis signal, and outputs a detection signal in a different output condition depending on whether or not the output value of the measurement signal from the measurement coil is lower than a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification