Direct current motor condition monitoring and exercising system
First Claim
Patent Images
1. Apparatus comprising:
- an hydraulic system;
a primary pressurization pump connected to the hydraulic system;
a backup pressurization pump connected to the hydraulic system;
a direct current power supply;
a direct current motor having an input terminal;
the direct current motor being coupled as a power source to the backup pressurization pump;
a relay having a control input, the relay being connected between the direct current power supply and the input terminal for the direct current motor;
a manually actuable switch connected between the direct current power supply and the control input for the relay; and
a relay controller coupled to the control input for the relay, the relay controller being adapted to provide periodically a control signal to the control input for closing and reopening the relay momentarily to energize the direct current motor.
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Abstract
Hydraulically actuated aerial lift trucks typically have a primary hydraulic pump system driven by the vehicle'"'"'s engine and a backup pump system driven by a direct current motor. Due to infrequent use of such motors, they are vulnerable to failure due to corrosion of the brush/commutator interface or seizing of the motor bearings. A remote power unit is provided to periodically run the back up motor for brief periods to maintain the motor in running condition. Voltage levels across the motor terminals are monitored for correspondence to failure indicating levels.
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Citations
15 Claims
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1. Apparatus comprising:
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an hydraulic system;
a primary pressurization pump connected to the hydraulic system;
a backup pressurization pump connected to the hydraulic system;
a direct current power supply;
a direct current motor having an input terminal;
the direct current motor being coupled as a power source to the backup pressurization pump;
a relay having a control input, the relay being connected between the direct current power supply and the input terminal for the direct current motor;
a manually actuable switch connected between the direct current power supply and the control input for the relay; and
a relay controller coupled to the control input for the relay, the relay controller being adapted to provide periodically a control signal to the control input for closing and reopening the relay momentarily to energize the direct current motor. - View Dependent Claims (2, 3, 4, 5)
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6. A condition monitoring and exercise apparatus for a direct current motor coupled by a relay to a power supply, the relay having a control input and an output coupled to the direct current motor, the apparatus comprising:
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a hard switch connected between the control input of the relay and the power supply;
a solid state switch having a gate and connected by an output to the relay control input;
a voltage divider network connected between the power supply and ground with an intermediate output coupled to a power output from the relay and the direct current motor;
an actuator connected to the gate for the solid state switch generating periodic, momentary gate actuation signals; and
a voltage level responsive fault indicator coupled to the intermediate output of the voltage divider network. - View Dependent Claims (7, 8, 9, 10)
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11. A motor vehicle comprising:
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an engine;
a direct current electrical power system;
a first controller area network including a remote power module;
the remote power module including a three state input and a control signal output;
a direct current motor;
a motor control switch connected by one terminal to the direct current electrical power system; and
an energization relay for the direct current motor, the energization relay having an input terminal connected both to the control signal output of the remote power module and to a second terminal for the motor control switch and having a power output terminal connected to the direct current motor and to the three state input of the remote power module. - View Dependent Claims (12, 13, 14, 15)
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Specification