Motor cooling system and motor cooling monitoring method
AssigneeMeidensha Corporation
InventorKiyoshi Uemura
Life of this patent
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Abstract
In a motor cooling system 1, a determination unit 33 is configured to perform periodic sampling of a driving current Ip or a rotation speed Np of an oil pump 23, and detect a decrease in cooling oil of a motor 2 when it is determined that a standard deviation of the driving current Ip or the rotation speed Np with respect to a plurality of sampling points is larger than a preset threshold value. The threshold value is set on the bases of a measurement value of the driving current Ip or the rotation speed Np of the oil pump 23 which is obtained by an operation test of the motor 2 in a state in which the cooling oil has decreased.
Claims14
A motor cooling system comprising:
- an oil pump for circulating cooling oil of a motor;
- and
- a determination unit configured to detect a decrease in the cooling oil when a standard deviation of a driving current of the oil pump with respect to a plurality of sampling points of the driving current is larger than a preset threshold value.
A motor cooling system comprising:
- an oil pump for circulating cooling oil of a motor;
- and
- a determination unit configured to detect a decrease in the cooling oil when a state in which a moving average value of a driving current of the oil pump which is obtained from a plurality of sampled data of the driving current is excessively smaller than a preset standard driving current by a certain amount is continued for a predetermined time.
A motor cooling system comprising:
- an oil pump for circulating cooling oil of a motor;
- and
- a determination unit configured to detect a decrease in the cooling oil when a standard deviation of a rotation speed of the oil pump with respect to a plurality of sampling points of the rotation speed is larger than a preset threshold value.
A motor cooling system comprising:
- an oil pump for circulating cooling oil of a motor;
- and
- a determination unit configured to detect a decrease in the cooling oil when a state in which a moving average value of a rotation speed of the oil pump which is obtained from a plurality of sampled data of the rotation speed is excessively smaller than a preset standard rotation speed by a certain amount is continued for a predetermined time.
A motor cooling monitoring method comprising:
- detecting a decrease in cooling oil of a motor when a standard deviation of a driving current or a rotation speed of an oil pump for circulating the cooling oil of the motor with respect to a plurality of sampling points of the driving current or the rotation speed is larger than a preset threshold value.
A motor cooling monitoring method in a motor cooling system including an oil pump for circulating cooling oil of a motor, comprising:
- detecting a decrease in the cooling oil when a state in which a moving average value of a driving current or a rotation speed of the oil pump which is obtained from a plurality of sampled data of the driving current or the rotation speed is excessively smaller than a preset standard driving current or a preset standard rotation speed by a certain amount is continued for a predetermined time.
Dependencies are inferred from the claim text.