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US 11,463,027 B2Granted
Electric working machine
AssigneeMakita Corporation
InventorYoshitaka Ichikawa
Life of this patent
Estimating the term…
Abstract
An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.
Claims13
An electric working machine comprising:
- a connection port configured to be coupled to a battery pack;
- a motor configured to be driven with electric power from the battery pack via the connection port;
- a switch for driving the motor;
- and
- a controller configured to acquire an internal resistance information related to an internal resistance value of the battery pack via the connection port, the controller being configured to acquire the internal resistance value based on the internal resistance information, the controller being configured to perform an open loop control of the motor based on a Pulse Width Modulation (PWM) signal of a command duty ratio, the command duty ratio being corresponding to a command value of a duty ratio of the PWM signal, the controller being configured to perform a soft start in response to switching of the switch to ON in the open loop control in order to gradually increase the command duty ratio to a target duty ratio, the target duty ratio being corresponding to a target value of the duty ratio, the controller being configured to set a first rate of change so that the first rate of change is decreased in accordance with a decrease in the internal resistance value in the soft start, and the first rate of change being corresponding to a rate of change in the command duty ratio.
2 more elements
An electric working machine comprising:
- a connection port configured to be coupled to a battery pack;
- a motor configured to be driven with electric power from the battery pack via the connection port;
- a switch for driving the motor;
- and
- a controller configured to acquire an internal resistance information related to an internal resistance value of the battery pack via the connection port, the controller being configured to acquire the internal resistance value based on the internal resistance information, the controller being configured to execute a constant rotation speed control to adjust a rotation speed of the motor to be consistent with a command rotation speed, the command rotation speed being corresponding to a command value of the rotation speed, the controller being configured to perform a soft start in response to switching of the switch to ON in the constant rotation speed control in order to gradually increase the command rotation speed to a target rotation speed, the target rotation speed being corresponding to a target value of the rotation speed, the controller being configured to set a second rate of change so that the second rate of change is decreased in accordance with the increase in the internal resistance value in the soft start, and the second rate of change being corresponding to a rate of change in the command rotation speed.
2 more elements
An electric working machine comprising:
- a connection port configured to be coupled to a battery pack including one battery block or more than one battery block;
- a motor configured to be driven with electric power from the battery pack via the connection port;
- and
- a controller configured to acquire an internal resistance information related to an internal resistance value of the battery pack via the connection port, the controller being configured to change control of the motor based on the internal resistance information acquired, the internal resistance information indicating a number of battery blocks included in the battery pack or a model number of the battery pack.
1 more element
Dependencies are inferred from the claim text.