Detector for Electromagnetic Brake
First Claim
1. A detector for an electromagnetic brake, while a brake force is generated by pressing a brake piece on a member for braking with the recovery force based on elastic deformation of a brake spring, said brake piece is driven away from the member for braking against the recovery force of said brake spring by means of an electromagnetic attracting force caused by excitation of a solenoid so that the brake force is released;
- the detector comprising;
a load sensor that detects the recovery force of said brake spring, anda judgment means that determines a condition of the electromagnetic brake based on the output of said load sensor;
wherein said judgment means determines whether the brake force of the electromagnetic brake is lower than a prescribed normal judgment lower limit or higher than a prescribed normal judgment upper limit based on the output of said load sensor, and, if the brake force of the electromagnetic brake is found to be lower than a prescribed normal judgment lower limit or higher than a prescribed normal judgment upper limit, a detection signal is output.
1 Assignment
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Accused Products
Abstract
A detector for an electromagnetic brake, for example used in an elevator system, that, by quantitative judgment, determines whether the brake force of the electromagnetic brake is appropriate. Load cells for detecting the recovery forces of brake springs are arranged between brake springs, which energize brake arms with brake shooes installed on them toward the side of brake wheel, and spring sheets, which hold brake springs in a compressive deformed state, and, at the same time, judgment part judges whether the brake force of electromagnetic brake 4 is outside a prescribed normal range based on the outputs of load cells. If the brake force of electromagnetic brake is outside the normal rnage, judgment part sends a signal, for example to a monitoring center.
12 Citations
12 Claims
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1. A detector for an electromagnetic brake, while a brake force is generated by pressing a brake piece on a member for braking with the recovery force based on elastic deformation of a brake spring, said brake piece is driven away from the member for braking against the recovery force of said brake spring by means of an electromagnetic attracting force caused by excitation of a solenoid so that the brake force is released;
- the detector comprising;
a load sensor that detects the recovery force of said brake spring, and a judgment means that determines a condition of the electromagnetic brake based on the output of said load sensor; wherein said judgment means determines whether the brake force of the electromagnetic brake is lower than a prescribed normal judgment lower limit or higher than a prescribed normal judgment upper limit based on the output of said load sensor, and, if the brake force of the electromagnetic brake is found to be lower than a prescribed normal judgment lower limit or higher than a prescribed normal judgment upper limit, a detection signal is output. - View Dependent Claims (2, 3, 4)
- the detector comprising;
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5. A detector for an electromagnetic brake, comprising:
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a sensor that outputs a signal indicative of a recovery force of said brake, and a judgment device connected to said sensor; wherein said judgment device receives said signal from said sensor, makes a comparison of said signal from said sensor with at least one of a brake force lower limit or a brake force upper limit, and generates a signal indicative of said comparison. - View Dependent Claims (6, 7, 8)
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9. An electromagnetic brake, comprising:
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a brake piece for engaging a moveable member; a brake spring for urging said brake piece against said moveable member with a recovery force; a solenoid for urging said brake piece away from said moveable member; a sensor that outputs a signal indicative of said recovery force; and a judgment device connected to said sensor; wherein said judgment device receives said signal from said sensor, makes a comparison of said signal from said sensor with at least one of a brake force lower limit or a brake force upper limit, and generates a signal indicative of said comparison. - View Dependent Claims (10, 11, 12)
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Specification