Drive device for single-phase series commutator motor

A driving device and motor technology, applied in the direction of electric generator/starter, AC motor control, electric motor/converter plug, etc., can solve the problems of resistor heating, large-scale electric tools, etc.
CN102739124AActive Publication Date: 2012-10-17MAKITA CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MAKITA CORP
Publication Date
2012-10-17

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Abstract

A drive device (1) of the present invention includes a pair of drive switches (12, 14), a first diode (D1), a switching element (16), a current detection unit (R1, 18), a capacitor (C1), a second diode (D2), and a current control unit (20). The first diode (D1), the switching element (16), and the current detection unit (R1, 18) are arranged, in this order from one end of an armature (4) in a motor (2), on a braking current path that is formed of the armature (4) and a field winding (6, 8) in the motor (2) when the pair of drive switches (12, 14) is in a brake position. The second diode (D2) is adapted to keep allowing a braking current to flow through the field winding (6, 8) when the switching element (16) is in an off-state by directly connecting a partial path between the switching element (16) and the current detection unit (R1, 18) on the braking current path and the other end of the armature (4).
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Description

technical field

[0001] The invention relates to a drive device for a single-phase series excitation commutator motor. Background technique

[0002] (Outline of single-phase series commutator motor)

[0003] A single-phase series commutator motor can be driven rotationally in both DC and AC power sources, and is called an AC-DC dual-purpose motor. Since it can be rotated at a high speed, the influence of the power supply frequency is small, and it can be manufactured at a low cost, it is better utilized for power tools using an AC power supply.

[0004] In addition, the single-phase series-excited commutator motor has an armature winding and a field winding connected in series, and when a power supply is connected there, torque is generated and rotational drive is performed.

[0005] The characteristic structure of the single-phase series commutator motor is that the generated torque is always fixed in one direction, regardless of the polarity of the AC power supply or the ...

Claims

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