Sensor device and method for controlling temperature by same
A technology of sensor devices and sensor elements, applied to temperature control using digital devices, temperature control using electric methods, temperature control, etc., can solve problems such as detection errors
Active Publication Date: 2015-06-10
SANKYO SEIKI MFG CO LTD
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Problems solved by technology
However, in a magnetic sensor device, for example, even when a bridge circuit is formed of a magnetically sensitive film, a detection error occurs when the temperature changes.
Method used
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Embodiment Construction
[0035] Hereinafter, a sensor device to which the present invention is applied will be described focusing on a magnetic sensor device constituting a magnetic rotary encoder with reference to the drawings.
[0036] (Structure of Magnetic Sensor Device)
[0037] figure 1 is an explanatory diagram of a magnetic sensor device to which the present invention is applied, figure 1 (a) and figure 1 (b) are a perspective view and an exploded view of the magnetic sensor device viewed from one side in the axial direction, respectively.
[0038] figure 1 The shown magnetic sensor device 10 (rotary encoder) has: a holder 6 fixed to a motor case or the like; a circuit board 50 fixed to the holder 6 by screws 61, 62, etc.; The magnet 20 rotates around an axis L passing through the center of the magnet. The magnet 20 faces the circuit board 50 inside the holder 6 . In this embodiment, the magnet 20 has a magnetized surface in which one N pole and one S pole are formed along the circumfere...
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The invention provides a sensor device and a method for controlling temperature by the sensor device, and the device can properly control a heater based on results of temperature of a sensor element monitored by a resistor element used for temperature monitoring. In a magnetic sensor device, a switching element is controlled according to comparison results of temperature detection voltage of divided voltage in a bleeder circuit and control target voltage, so as to control power-on of a resistive film (heater) used for heating. Before the magnetic sensor device leaves factory, a process of applying constant voltage control target voltage setting on the bleeder circuit, and a microcomputer calculates temperature detection voltage when the resistive film used for temperature monitoring is in a preset temperature based on environment temperature when applying constant voltage on the bleeder circuit, temperature detection voltage when applying constant voltage on the bleeder circuit, resistance value of a divider resistor, and temperature coefficient of the resistance value of the resistive film used for temperature monitoring, and the calculation result of the temperature detection voltage is set as the control target voltage.
Description
technical field [0001] The invention relates to a sensor device provided with a heater on a sensor element and a method for controlling temperature using the sensor device. Background technique [0002] In a sensor device, a sensor element measures a physical quantity of a detection target. For example, in a magnetic sensor device having a magnetoresistive element, a change in a magnetic field accompanying rotation of a permanent magnet or the like is detected to detect the position of the permanent magnet or the like (for example, refer to Patent Document 1). [0003] The detection result of the sensor often changes according to the temperature. For example, the resistance value of a magnetoresistive element used in a magnetic sensor device or a magnetosensitive film used in a Hall element changes according to temperature. Here, when the bridge circuit is formed of magnetic sensitive films, even if the resistance value changes due to temperature changes, as long as such c...
Claims
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IPC IPC(8): G05D23/24
CPCG05D23/19G05D23/1917G05D23/1919G05D23/24
Inventor 奥村宏克川手浩小田切秀行常田晴弘
Owner SANKYO SEIKI MFG CO LTD