An oscillating power tool, including: a housing; an output shaft for installing a working head, the output shaft being installed in the housing and extending out of the housing; a transmission mechanism, installed in the housing, and the transmission mechanism being connected to the output shaft; and a motor, installed in the housing, the motor being connected to the transmission mechanism and driving the transmission mechanism to drive the output shaft to move, where an outer diameter of the motor is in a range of 40 mm to 50 mm.

An oscillating power tool, including: a housing; an output shaft for installing a working head, the output shaft being installed in the housing and extending out of the housing; a transmission mechanism, installed in the housing, and the transmission mechanism being connected to the output shaft; and a motor, installed in the housing, the motor being connected to the transmission mechanism and driving the transmission mechanism to drive the output shaft to move, where an outer diameter of the motor is in a range of 40 mm to 50 mm.

The present invention provides a direct current motor, including: a casing; m pairs of brushes fixed within the casing; a stator provided within the casing, including m main poles corresponding to the m pairs of brushes, and n field winding parts; and a rotor provided within the stator, wherein each pair of main poles includes an S-polarity main pole and an N-polarity main pole, two neighboring main poles are different in polarity, the two brushes in each pair of brushes are arranged at neighboring positions, each pair of brushes includes an S-pole corresponding brush corresponding to the S-polarity main pole, and an N-pole corresponding brush corresponding to the N-polarity main pole, each field winding part includes m field winding units corresponding to the m pairs of main poles, respectively, each field winding unit is made up of field coils formed by winding an insulated conductor strip, which is made of a metal wire coated with an insulating layer, around one pair of main poles corresponding to each other, and m is a positive integer not less than 2, and n is 1 or 2.

An electric tool includes: a housing; a motor accommodated in the housing and providing power to a working component, the motor includes a stator including an excitation winding and a rotor including an armature winding, and the excitation winding is connected in series to the armature winding; a first power input unit, capable of connecting to an external AC power source so as to provide an alternating current to the motor; a second power input unit, capable of connecting to a battery component so as to provide a direct current to the motor; and a power source control unit, controlling the motor to obtain power input by using one of the first power input unit and the second power input unit. The electric tool can adapt to an AC power source and a DC power source, and the motor has a simple structure.

An electric tool includes: a housing; a motor accommodated in the housing and providing power to a working component, the motor includes a stator including an excitation winding and a rotor including an armature winding, and the excitation winding is connected in series to the armature winding; a first power input unit, capable of connecting to an external AC power source so as to provide an alternating current to the motor; a second power input unit, capable of connecting to a battery component so as to provide a direct current to the motor; and a power source control unit, controlling the motor to obtain power input by using one of the first power input unit and the second power input unit. The electric tool can adapt to an AC power source and a DC power source, and the motor has a simple structure.

An electric drive apparatus includes a DC motor for driving the electric device; a DC power source for outputting constant-voltage DC power to the DC motor; and a chopper for converting the constant-voltage DC power into variable-voltage DC power according to a driving signal and providing the variable-voltage DC power to the DC motor. The DC motor has 2j armature winding branches, each of which consists of m windings, 2jm commutator segments connected to the windings, and two brush sets respectively connected to two power line sets of the DC motor and in contact with the commutator segments.

An electric drive apparatus includes a DC motor for driving the electric device; a DC power source for outputting constant-voltage DC power to the DC motor; and a chopper for converting the constant-voltage DC power into variable-voltage DC power according to a driving signal and providing the variable-voltage DC power to the DC motor. The DC motor has 2j armature winding branches, each of which consists of m windings, 2jm commutator segments connected to the windings, and two brush sets respectively connected to two power line sets of the DC motor and in contact with the commutator segments.

A DC electric drive apparatus and an electric device. The DC electric drive apparatus (10) is provided in an electric device to drive the electric device, comprising: a DC motor (11), for driving the electric device; a DC power source, for outputting constant-voltage DC power to the DC motor; and a chopper (12), for converting constant-voltage DC power into variable-voltage DC power according to a driving signal and providing variable-voltage DC power for the DC motor, wherein, the DC motor has 2j armature winding branches (16) each composed of m windings (16a), 2jm commutator segments connected to the windings, and two brush sets (17) respectively connected to two power line sets of the DC motor and in contact with the commutator segments; each of the brush sets comprises j brushes (18); each of the power line sets comprises j power lines; the chopper has k bridge arm portions (19), and each of the bridge arm portions comprises j bridge arm units (20) connected to j power lines of one power line set in one-to-one correspondence; each of bridge arm units outputs a current for two armature winding branches through correspondingly connected power lines, and the armature winding branches generate output torques to drive the electric device. Both j and m are positive integers not less than 2, and k is 1 or 2.

A DC electric drive apparatus and an electric device. The DC electric drive apparatus (10) is provided in an electric device to drive the electric device, comprising: a DC motor (11), for driving the electric device; a DC power source, for outputting constant-voltage DC power to the DC motor; and a chopper (12), for converting constant-voltage DC power into variable-voltage DC power according to a driving signal and providing variable-voltage DC power for the DC motor, wherein, the DC motor has 2j armature winding branches (16) each composed of m windings (16a), 2jm commutator segments connected to the windings, and two brush sets (17) respectively connected to two power line sets of the DC motor and in contact with the commutator segments; each of the brush sets comprises j brushes (18); each of the power line sets comprises j power lines; the chopper has k bridge arm portions (19), and each of the bridge arm portions comprises j bridge arm units (20) connected to j power lines of one power line set in one-to-one correspondence; each of bridge arm units outputs a current for two armature winding branches through correspondingly connected power lines, and the armature winding branches generate output torques to drive the electric device. Both j and m are positive integers not less than 2, and k is 1 or 2.

An oscillating power tool, including: a housing; an output shaft for installing a working head, the output shaft being installed in the housing and extending out of the housing; a transmission mechanism, installed in the housing, and the transmission mechanism being connected to the output shaft; and a motor, installed in the housing, the motor being connected to the transmission mechanism and driving the transmission mechanism to drive the output shaft to move, where an outer diameter of the motor is in a range of 40 mm to 50 mm.