Power tool and method for operating a power tool
A power tool having a motor is provided, wherein the motor includes a rotor and a stator, and wherein the stator includes a first winding and a second winding, wherein the windings are designed in such a way that the windings allow operation of the motor of the power tool at substantially full speed, but at substantially half the power compared with the comparison motor. In the comparison motor, the stator coils are substantially completely wrapped with a continuous wire layer. method for operating such a power tool and a method for carrying out charge equalization between two accumulators in a power tool is also provided. The double-wound stator can be used in conjunction with a bridge circuit made up of motor inverters and stator coils to allow charge equalization between two accumulators in a power tool.
1 . A method for carrying out charge equalization between two accumulators in a power tool, the power tool having a first inverter for energizing first stator coils and a second inverter for energizing second stator coils, the first and second inverters forming a bridge circuit with the first and second stator coils, the method comprising carrying out via the bridge circuit charge equalization between the first and second accumulators,
the first and second stator coils forming a stator having a first winding and a second winding, wherein the charge equalization takes place in that electrical energy is transmitted from the first winding to the second winding of the stator, or vice versa.
2 . The method as recited in claim 1 wherein the power tool includes a motor, the motor including a rotor and the stator.
3 . The method as recited in claim 2 wherein the first winding includes a first wire layer and the second winding includes a second wire layer, each of the first and second stator coils including the first wire layer and the second wire layer.
4 . The method as recited in claim 2 wherein the motor is a brushless motor.
5 . The method as recited in claim 1 wherein the first stator coils and the second stator coils are opposite one another within the stator.
6 . The method as recited in claim 1 wherein the first stator coils include at least three first stator coils and the second stator coils include at least three second stator coils.
7 . The method as recited in claim 1 wherein the two accumulators include a first accumulator and a second accumulator, the first and second accumulators being assigned respectively to the first and second inverters, the charge equalization between the first or second accumulator with a higher charge state and the other of the first and second accumulators with a lower charge state taking place in that the other of the first and second accumulators with the lower charge state is transferred from an operating mode to a generator mode by the assigned first or second inverter.