MOTOR-DRIVEN APPLIANCE AND BATTERY PACK
First Claim
1. A motor-driven appliance comprising:
- a battery;
a motor that includes permanent magnets as field magnets and is operated by electric power from the battery;
a momentary maximum current upper limit storage unit in which a predetermined momentary maximum current upper limit is stored;
a current detection unit that detects a current flowing in the motor;
a current threshold setting unit that generates a current threshold based on the momentary maximum current upper limit stored in the momentary maximum current upper limit storage unit, and outputs the generated current threshold;
a current exceedance determination unit that determines whether the current detected by the current detection unit has become equal to or greater than the current threshold, and outputs an interruption signal used to interrupt a current path from the battery to the motor when the detected current has become equal to or greater than the current threshold; and
a current flow interruption unit that interrupts the current path when the interruption signal is outputted from the current exceedance determination unit.
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Accused Products
Abstract
A motor-driven appliance includes a battery; a motor including permanent magnets as field magnets; a momentary maximum current upper limit storage unit in which a predetermined momentary maximum current upper limit is stored; a current detection unit that detects a current flowing in the motor; a current threshold setting unit that generates a current threshold based on the momentary maximum current upper limit, and outputs the generated current threshold; a current exceedance determination unit that determines whether the current detected by the current detection unit has become equal to or greater than the current threshold, and outputs an interruption signal used to interrupt a current path from the battery to the motor when the detected current has become equal to or greater than the current threshold; and a current flow interruption unit that interrupts the current path when the interruption signal is outputted from the current exceedance determination unit.
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Citations
15 Claims
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1. A motor-driven appliance comprising:
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a battery; a motor that includes permanent magnets as field magnets and is operated by electric power from the battery; a momentary maximum current upper limit storage unit in which a predetermined momentary maximum current upper limit is stored; a current detection unit that detects a current flowing in the motor; a current threshold setting unit that generates a current threshold based on the momentary maximum current upper limit stored in the momentary maximum current upper limit storage unit, and outputs the generated current threshold; a current exceedance determination unit that determines whether the current detected by the current detection unit has become equal to or greater than the current threshold, and outputs an interruption signal used to interrupt a current path from the battery to the motor when the detected current has become equal to or greater than the current threshold; and a current flow interruption unit that interrupts the current path when the interruption signal is outputted from the current exceedance determination unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A battery pack used attached to a main body of a motor-driven appliance, the battery pack comprising:
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a battery that supplies electric power to a motor that is mounted in the main body and includes permanent magnets as field magnets; a current detection unit that detects a current flowing from the battery to the motor; a current threshold setting unit that generates a current threshold based on a momentary maximum current upper limit stored in the main body, and outputs the generated current threshold; and a current exceedance determination unit that determines whether the current detected by the current detection unit has become equal to or greater than the current threshold, and outputs an interruption signal used to interrupt a current path from the battery to the motor when the detected current has become equal to or greater than the current threshold.
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Specification