Dust collector

Abstract

A dust collector for suctioning dust includes: an electric motor for collecting dust; a power supply device that supplies electric power to outside; a parameter detection device that detects a parameter (hereinafter referred to as a “current parameter”) which changes depending on a state of a supplied current supplied by the power supply device; a determination device that determines whether or not a value of the current parameter detected by the parameter detection device satisfies a condition based on a threshold value stored in a first storage unit; and a current supply starting device that starts current supply to the electric motor when it is determined by the determination device that the value of the current parameter satisfies the condition.

1 . A dust collector for suctioning dust comprising:
 an electric motor for collecting dust;   a power supply device that supplies electric power to outside;   a parameter detection device that detects a parameter (hereinafter referred to as a “current parameter”) which changes depending on a state of a supplied current supplied by the power supply device;   a determination device that determines whether or not a value of the current parameter detected by the parameter detection device satisfies a condition based on a threshold value stored in a first storage unit; and   a current supply starting device that starts current supply to the electric motor when it is determined by the determination device that the value of the current parameter satisfies the condition.   
     
     
         2 . The dust collector according to  claim 1 , wherein
 the parameter detection device detects an integrated current value, which is obtained by integrating an absolute value of a current value of the supplied current from when supply of the supplied current is started, as the current parameter.   
     
     
         3 . The dust collector according to  claim 2 , wherein
 the first storage unit stores a first threshold value indicating a threshold value of the integrated current value, and   the determination device determines that the value of the current parameter satisfies the condition when the value of the current parameter is equal to or more than the first threshold value.   
     
     
         4 . The dust collector according to  claim 3 , wherein
 the parameter detection device resets the current parameter to an initial value when an integrated time, which is obtained by integrating a time during which the current value of the supplied current is less than a second threshold value stored in a second, storage unit, exceeds a third threshold value stored in a third storage unit.   
     
     
         5 . The dust collector according to  claim 1 , wherein
 the power supply device supplies electric power having a periodically changing current value, and   when a time, during which the absolute value of the current value of the supplied current is more than “0” and also is equal to or more than a predetermined current value that is less than a maximum current value, is referred to as a “current supply time”, the parameter detection device detects, as the current parameter, an integrated value of the current supply time from when supply of the supplied current is started.   
     
     
         6 . The dust collector according to  claim 5 , wherein
 the first storage unit stores a fourth threshold value indicating a threshold value of the integrated value of the current supply time, and   the determination device determines that the value of the current parameter satisfies the condition when the value of the current parameter is equal to or more than the fourth threshold value.   
     
     
         7 . The dust collector according to  claim 1 , wherein
 the power supply device supplies electric power having a periodically changing current value, and   when a state, in which an absolute value of the current value of the supplied current is more than “0” and also is equal to or more than a predetermined current value that is less than a maximum current value, is referred to as a “current supplied state”, a time during which the current supplied state is present is referred to as a “current supply time”, and a number of times of shifts to the current supplied state from when supply of the supplied current is started is referred to as a “counter value”, the parameter detection device detects the counter value as the current parameter, while making the counter value correspond to the current supply time.   
     
     
         8 . The dust collector according to  claim 7 , wherein
 the first storage unit stores a fifth threshold value indicating a threshold value of the counter value corresponding to the current supply time, the fifth threshold value being set to be larger as the current supply time is shorter, and   the determination device determines that the value of the current parameter satisfies the condition when the value of the current parameter is equal to or more than the fifth threshold value.   
     
     
         9 . The dust collector according to  claim 5 , wherein
 the parameter detection device resets the current parameter to an initial value when an integrated time, which is obtained by integrating a time during which the current supply time is unable to be detected, exceeds a sixth threshold value stored in the first storage unit.   
     
     
         10 . The dust collector according to  claim 1 , further comprising a condition changing device that is configured to change a value indicating the condition and is operable by a user.