Power tools and brake circuits for motors
A technology of braking circuit and control circuit, applied in the direction of reduction gear of DC motor, electric motor/converter plug, etc., can solve problems such as shortening the service life of the machine, sparks generated by the commutator, and reducing the user's operating comfort.
Active Publication Date: 2018-06-26
NANJING CHERVON IND
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AI Technical Summary
Problems solved by technology
During the braking process, the braking current corresponding to the motor speed flows through the current loop. Therefore, at the beginning of the braking, the braking current is too large, and the excessive braking current will cause the commutator of the motor to generate sparks, Easy to damage, the machine produces strong vibration and noise, which shortens the service life of the machine and reduces the operating comfort of the user
Method used
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Embodiment Construction
[0066] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0067] The present invention provides an electric tool, which includes a motor and a brake circuit, wherein the brake circuit can make the motor brake quickly.
[0068]figure 1 Shown is the modular circuit diagram of the motor and braking circuit in the electric tool of the present invention; figure 2 shown as figure 1 The specific structure diagram of the motor and brake circuit in . Please also refer to figure 1 and figure 2 , the electric tool includes: motor 1, braking circuit 2 and power supply 3, the power supply 3 is used to supply power to motor 1 to make it run; motor 1 includes: stator and rotor, and the stator includes: stator core (not shown) and excitation winding 11. The rotor includes: a rotor core (not shown in the figure), an armature 12, and a commutator (not shown in the figure). The field winding 11 includes a p...
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The invention discloses an electric tool. The electric tool comprises a motor and a brake circuit. The motor comprises an excitation winding circuit and an armature circuit. The brake circuit has a driving state and a brake state and comprises: operation switches used for switching between the driving state and the brake state; a first circulation circuit for forming a unidirectional conducted loop with the armature circuit when the break circuit is at the brake state; a second circulation circuit for forming a unidirectional conducted loop with the excitation winding circuit when the break circuit is at the brake state and the first circulation circuit is disconnected; an energy storage circuit for storing electric energy when the brake circuit is at the driving state and releasing the electric energy when the brake circuit is at the brake state; and a control circuit for controlling a duty ratio when the first circulation circuit is conducted according to the quantity of electricity stored by the energy storage circuit. The brake circuit provided by the invention can realize rapid brake of the motor in a safe and reliable way.
Description
technical field [0001] The invention relates to an electric tool, in particular to a braking circuit capable of realizing braking. Background technique [0002] The driving device of the traditional single-phase series commutator motor usually sets double-pole double-throw switches at both ends of the field winding to switch the connection direction of the field winding, change the torque direction of the motor, and realize the braking of the motor. Normally, the armature and field windings are connected in series and connected to the power supply. When the armature winding or the field winding is reversely connected, the armature winding and the field winding connected in series are short-circuited to form a current loop, thereby generating a torque in the opposite direction to the normal state to achieve braking. During the braking process, the braking current corresponding to the motor speed flows through the current loop. Therefore, at the beginning of the braking, the ...
Claims
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IPC IPC(8): H02P3/06H02P3/12
Inventor 王槐树杨德中范宝锋
Owner NANJING CHERVON IND