Electric operating machine

Abstract

When a main switch ( 12 ) is turned ON, an electric operating machine ( 1 ) is put in the standby mode. With a trigger ( 13 ) being pulled in the standby mode, a power supply circuit ( 16 ) applies a voltage to a drive part ( 30 ). The power supply circuit ( 16 ) adjusts the voltage applied to the drive part ( 30 ) for a voltage corresponding to the pulling rate of the trigger ( 13 ). When the current running toward the drive part ( 30 ) exceeds the rated value of the drive part ( 30 ), the power supply circuit ( 16 ) automatically stops power supply to the drive part ( 30 ). On the other hand, when the output voltage of a battery ( 50 ) drops and the battery ( 50 ) is put in an overdischarge state, power supply to the drive part ( 30 ) is automatically stopped. When it is detected that the battery ( 50 ) undergoes an abnormal event, power supply to the drive part ( 30 ) is automatically stopped.

1 . An electric operating machine comprising:
 a power source part including a battery mounting part for mounting a battery, and a voltage conversion part converting and outputting the voltage input from the battery; and   an electric motor to which a work tool rotating in association therewith is connected and that rotates upon application of the voltage output from the voltage conversion part, characterized in that   the power source part further includes a voltage measuring part measuring the voltage applied to the electric motor and outputting it to the voltage conversion part; and   the voltage conversion part adjusts the output voltage so that the voltage output from the voltage measuring part has a given level.   
     
     
         2 . The electric operating machine according to  claim 1  characterized in that a battery of any voltage is mounted on or dismounted from the battery mounting part. 
     
     
         3 . The electric operating machine according to  claim 1  characterized in that the power source part further comprises an overcurrent protection part blocking the current running toward the electric motor when the current running toward the electric motor exceeds a given value. 
     
     
         4 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a first announcing part announcing that an overcurrent is running when the current running toward the electric motor exceeds a given value. 
     
     
         5 . The electric operating machine according to  claim 1  characterized in that the power source part further comprises an overdischarge protection part blocking the current running toward the electric motor when the voltage output from the battery becomes lower than a predetermined voltage. 
     
     
         6 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a second announcing part announcing that the battery is overly discharging when the voltage output from the battery becomes lower than a predetermined voltage. 
     
     
         7 . The electric operating machine according to  claim 5  characterized in that the power source part further comprises a voltage determination part determining the predetermined voltage based on battery information of the battery that is output from the battery. 
     
     
         8 . The electric operating machine according to  claim 1  characterized in that the power source part further comprises a battery abnormality stop part blocking the current running toward the electric motor according to battery abnormality signals output from the battery when the battery undergoes an abnormal event. 
     
     
         9 . The electric operating machine according to  claim 8  characterized in that the battery abnormality stop part blocks the current running toward the electric motor until the battery is dismounted from the battery mounting part since it receives the battery abnormality signals. 
     
     
         10 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a third announcing part announcing that the battery undergoes an abnormal event when the battery undergoes an abnormal event. 
     
     
         11 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a trigger, and the voltage measuring part applies to the voltage conversion part a voltage according to the pulling rate of the trigger. 
     
     
         12 . The electric operating machine according to  claim 1  characterized in that the power source part further comprises a trigger switch part blocking the current running toward the electric motor when the pulling rate of the trigger is lower than a given rate and allowing a current to run through the electric motor when the pulling rate of the trigger is equal to or higher than the given rate. 
     
     
         13 . The electric operating machine according to  claim 12  characterized in that the power source part further comprises a main switch part blocking the current running from the battery to the trigger switch part when it is turned OFF and allowing the current when it is turned ON. 
     
     
         14 . The electric operating machine according to  claim 13  characterized in that the electric operating machine further comprises a first light emitting part emitting light when the main switch part is ON. 
     
     
         15 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a remaining battery level display displaying the remaining battery level according the voltage output from the battery. 
     
     
         16 . The electric operating machine according to  claim 1  characterized in that the power source part further comprises a constant voltage circuit outputting a constant voltage from the voltage output from the battery. 
     
     
         17 . The electric operating machine according to  claim 16  characterized in that the electric operating machine further comprises a sound reproducing part operating upon application of a voltage output from the constant voltage circuit, decoding sound data, and reproducing sound information. 
     
     
         18 . The electric operating machine according to  claim 16  characterized in that the electric operating machine further comprises a radio operating upon application of a voltage output from the constant voltage circuit and detecting sound information in radio waves received by an antenna. 
     
     
         19 . The electric operating machine according to  claim 16  characterized in that the electric operating machine further comprises a speaker amplifying the sound information and making sound by a voltage output from the constant voltage circuit. 
     
     
         20 . The electric operating machine according to  claim 1  characterized in that the electric motor is a coreless motor. 
     
     
         21 . The electric operating machine according to  claim 20  characterized in that the electric operating machine further comprises a coupling part on whose one end the power source part is arranged and on whose other end the electric motor is arranged. 
     
     
         22 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a second light emitting part emitting light when the electric motor is powered. 
     
     
         23 . The electric operating machine according to  claim 1  characterized in that the electric operating machine further comprises a fourth announcing part announcing the power supply when the electric motor is powered. 
     
     
         24 . The electric operating machine according to  claim 20  characterized in that the coreless motor includes a rotor and a stator;
 the rotor includes a fixed output shaft; 
 one of the rotor and stator comprises a disc-shaped coil substrate including multiple nearly annular coils arranged in the circumferential direction around the output shaft when seen in the axial direction of the output shaft; and 
 the other of the rotor and stator comprises a magnet generating a magnetic flux passing through the coil substrate in the axial direction of the output shaft. 
 
     
     
         25 . An electric operating machine comprising:
 a coreless motor;   a power source part comprising a mounting part to which a lithium rechargeable battery is detachably mounted; and   a coupling part holding the coreless motor at one end and holding the power source part at the other end, characterized in that:   the coreless motor includes a rotor and a stator;   the rotor includes a fixed output shaft;   one of the rotor and stator comprises a disc-shaped coil substrate including multiple nearly annular coils arranged in the circumferential direction around the output shaft when seen in the axial direction of the output shaft; and   the other of the rotor and stator comprises a magnet generating a magnetic flux passing through the coil substrate in the axial direction of the output shaft.   
     
     
         26 . An electric operating machine comprising:
 a coreless motor;   a power source part comprising a mounting part to which a rechargeable battery is detachably mounted;   a coupling part holding the coreless motor at one end and holding the power source part at the other end;   a grip part extending in the longitudinal direction of the coupling part, including a trigger operable by the operator for controlling the drive of the coreless motor, and being continued from or close to the power source part; and   a handle provided on the coupling part at a distance from the power source part and grip part for being held by the operator, characterized in that:   the coreless motor includes a rotor and a stator;   the rotor includes a fixed output shaft;   one of the rotor and stator comprises a disc-shaped coil substrate including multiple nearly annular coils arranged in the circumferential direction around the output shaft when seen in the axial direction of the output shaft;   the other of the rotor and stator comprises a magnet generating a magnetic flux passing through the coil substrate in the axial direction of the output shaft; and   the coreless motor is heavier than the rechargeable battery mounted on the mounting part and the gravity center of the electric operating machine is located on the coreless motor side with respect to the handle.   
     
     
         27 . The electric operating machine according to  claim 26  characterized in that the coreless motor comprises an aluminum alloy motor case housing the rotor.