Motor driving device

A motor driving device includes a housing unit, a capacitor module, and a driving module. The housing unit includes a first compartment and a second compartment. The capacitor module is detachably mounted in the first compartment and includes a first circuit board, at least one capacitor electrically connected to the first circuit board, and two first conducting members electrically connected to the first circuit board. The driving module is mounted in the second compartment and includes a second circuit board and two second conducting members that are electrically connected to the second circuit board and that are respectively, electrically and detachably connected to the first conducting members.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Taiwanese Patent Application No. 107116690 filed on May 16, 2018.

FIELD

The disclosure relates to a driving device, more particularly to a motor driving device.

BACKGROUND

Capacitors are widely used in electronic circuits for providing different functions according to various requirements in electronic circuits. No matter what function the capacitors provide in electronic circuits, the capacitors are charged and discharged repeatedly and thus service life of the capacitors is relatively short as compared to the remaining electronic components in electronic circuits. Once any one of the capacitors in an electronic circuit is broken or malfunctioned, the electronic circuit cannot operate properly.

Generally, capacitors are mounted on electronic circuits using surface-mount technology (SMT) or through hole technology. When replacement of broken capacitors is required, a technician uses specific tools to detach the broken capacitors from electronic circuits and to replace the same with normally operated capacitors. Thus, it is relatively troublesome and difficult for users of the electronic circuits to replace broken capacitors.

SUMMARY

Therefore, an object of the disclosure is to provide a motor driving device that is relatively simple for users to replace broken capacitors by themselves.

According to one aspect of the disclosure, a motor driving device is provided. The motor driving device includes a housing unit, a capacitor module, and a driving module. The housing unit includes a first compartment and a second compartment. The capacitor module is detachably mounted in the first compartment and includes a first circuit board, at least one capacitor electrically connected to the first circuit board, and two first conducting members electrically connected to the first circuit board. The driving module is mounted in the second compartment and includes a second circuit board and two second conducting members that are electrically connected to the second circuit board and that are respectively, electrically and detachably connected to the first conducting members.

DETAILED DESCRIPTION

Referring toFIGS. 1-3, a motor driving device according to a first embodiment of the present disclosure is shown. The driving device is electrically connected between an external power source (not shown) and a load, for example, a three-phase motor (not shown). The driving device includes a housing unit10, a capacitor module20, a driving module30and a fastening unit40.

The housing unit10includes a main housing11and a cover12fastened to the main housing11. The main housing11includes a partition plate13and a surrounding wall14. The surrounding wall14is connected to and surrounds a periphery of the partition plate13and has an upper surrounding portion141and a lower surrounding portion142divided by the partition plate13. The partition plate13, the upper surrounding portion141and the cover12cooperate with one another to define a first compartment15thereamong. The partition plate13cooperates with the lower surrounding portion142to define a second compartment16.

The upper surrounding portion141has a top end surface143, an upwardly facing seal-supporting surface144adjacent to and slightly lower than the top end surface143, a plurality of slot units145and a slit146. Each of the slot units145extends downwardly from the seal-supporting surface144toward the lower surrounding portion142, is in spatial communication with the first compartment15and the ambient surroundings and is adapted for a respective one of electric cables51,52to pass therethrough. The slit146extends downwardly from the seal-supporting surface144toward the lower surrounding portion142and is in spatial communication with the slots145. Each of the slots units145is divided into two halves by the slit146. The partition plate13is formed with two openings131in spatial communication with the first compartment15and second compartment16, and three through holes132in spatial communication with the first compartment15and second compartment16. The housing unit10further includes a leak-proof seal17sealingly disposed between the main housing11and the cover12and disposed on and above the seal-supporting surface144, and a sealing member18embedded in the slit146. The sealing member18is formed with a plurality of through holes181, which correspond respectively in position to the slots145and each of which is adapted to allow a corresponding one of the electric cables51,52to sealingly extend therethrough.

The capacitor module20is detachably mounted in the first compartment15and includes a first circuit board21disposed on the partition plate13, a plurality of capacitors22electrically connected to the first circuit board21, and two first conducting members23electrically connected to the first circuit board21.

The driving module30is mounted in the second compartment16and includes a second circuit board31, two second conducting members32and three phase line connectors33. The phase line connectors33are electrically connected to the second circuit board31. The second conducting members32are electrically connected to the second circuit board31and are respectively, electrically and detachably connected to the first conducting members23. Specifically, each of the second conducting members32includes a straight positioning segment321that is electrically connected to the second circuit board31, and an extending segment322that is connected to the positioning segment321, that is inverted-L-shaped, that extends into a respective one of the openings131of the partition plate13, and that is electrically connected to a respective one of the first conducting members23. The phase line connectors33extend into the through holes132of the partition plate13, respectively. The driving module30is configured to drive the three-phase motor connected thereto. Note that the feature of the present disclosure does not reside in the detail of how the driving module30drives the three-phase motor, further details of the same are thus omitted.

The fastening unit40includes a plurality of fastening members41made of conductive materials, and detachably and electrically interconnecting the first conducting members23and the second conducting members32.

As shown inFIGS. 1 to 3, to assemble the motor driving device, after the capacitor module20and the driving module30are respectively mounted in the first compartment15and the second compartment16, the first conducting members23are fastened to the second conducting members32by the fastening members41. Subsequently, the electric cables51that are connected to the external power source (not shown) are fastened respectively to the first conducting members23by two screws511according to functional requirement of the load, e.g. three-phase motor, connected to the motor driving device. Then, the electric cables52are fastened respectively to the phase line connectors33and are inserted respectively through the respective one of the slot units145. Finally, the sealing member18, the leak-proof seal17and the cover12are sequentially mounted on the main housing11and the cover12is secured on the main housing11by some fastening members such as screws. Note that the first circuit board21and the second circuit board31may be mounted to the housing unit10by various fastening elements such as screws and resilient hooks cooperating with mounting holes, and the present disclosure is not limited to the disclosure herein.

In this way, when the capacitors22of the capacitor module20are broken or malfunctioned and replacement of the capacitor module20is required, after the fastening members securing the cover12to the main housing11is removed, the cover12is removed, the leak-proof seal17is removed from the housing unit11and the screws511are loosened to allow the electric cables51to be detached from the first conducting members23. The fastening members41are then loosened to allow the first conducting members23to be respectively removed from the second conducting members32, and thus the capacitor module20can be removed from the first compartment15and be replaced in a relatively simple manner.

As compared to conventional capacitor replacement approach involving use of specific tools, the structure of the motor driving device of the present disclosure provides a relatively easy approach for the users to replace the capacitor module20. In one embodiment, all the capacitors22of the motor driving device of the present disclosure are integrated in the capacitor module20. Since service life of the capacitors are usually shorter than the remaining electronic components such as the driving module30in the motor driving device, the design of separating all the capacitors22from the remaining electronic components provides a cost effective way for repairing the motor driving device without replacing components provided with capacitors.

Referring toFIGS. 4 and 5, the driving device according to a second embodiment of the present disclosure is shown. In this embodiment, the motor driving device includes a housing unit10′, a capacitor module20′, a driving module30and a fastening unit40. The difference between the second embodiment and the first embodiment resides in the following. The housing unit10′ includes a main housing11′, an auxiliary housing19′ connected to the main housing11′, and a cover12′ detachably mounted to the auxiliary housing19′. The auxiliary housing19′ cooperates with the cover12′ to define the first compartment15. The main housing11′ defines the second compartment16therein. The cover12′ includes two connecting terminals121′ electrically and respectively connected to the first conducting members23and adapted to be connected to external power sources (not shown). The main housing11′ includes three phase line terminals111′ electrically connected to the second circuit board31at the three phase line connectors33, respectively.

In this embodiment, the main housing11′ and the auxiliary housing19′ are manufactured separately and are integrally connected to each other. The auxiliary housing19′ is formed with two first through holes191′. The main housing11′ is formed with two second openings112′ corresponding in position to and communicate with the first through holes191′, respectively.

Each of the second conducting members32includes a positioning segment321that is electrically connected to the second circuit board31and an extending segment322that is connected to the positioning segment321, that extends through a respective one of the second openings112′ of the main housing11′ and a corresponding one of the first through holes191′ of the auxiliary housing19′, and that is electrically connected to a respective one of the first conducting members23. Note that the leak-proof seal17, the sealing member18shown inFIG. 1are omitted in this embodiment.

Referring toFIG. 6, the driving device according to a third embodiment of the present disclosure is shown. The motor driving device of the third embodiment includes a housing unit10″, a capacitor module20″, a driving module30and a fastening unit40. The difference between the third embodiment and the second embodiment resides in the following.

In the third embodiment, the main housing11″ and the auxiliary housing19′ of the housing unit10′ are integrally formed. The main housing11″ includes an upper plate113″ connected integrally to the auxiliary housing19″ and formed with two slots115″ that are in spatial communication with the first compartment15and the second compartment16, and a periphery wall114″ surrounding and connected to a periphery of the upper plate113″. The first circuit board21of the capacitor module20is disposed on the upper plate113″.

Each of the first conducting members23of the capacitor module20includes a straight segment231″, a first bent segment232″ and a second bent segment233″. For each of the first conducting members23, the straight segment231″ is electrically connected to the first circuit board21. For each of the first conducting members23, the first bent segment232″ is inverted-L-shaped, is connected to one end of the straight segment231″, extends through a respective one of the slots115″ and is electrically connected to a respective one of the second conducting members32. Also for each of the first conducting members23, the second bent segment233″ is connected to the other end of the straight segment231″ and is adapted to be electrically connected to a respective one of fastening members511extending from the cover12, electrically connected to a corresponding one of the external power sources, and fastening the cover12to the main housing11″.

Referring toFIG. 7, the driving device according to a fourth embodiment of the present disclosure is similar to the third embodiment. The difference between the third embodiment and the fourth embodiment resides in that the upper plate113″ of the main housing11is formed with only one slot115″ that allows the first bent segments232″ of the first conducting members23to extend therethrough. The second to fourth embodiments possess the same advantages as the first embodiment.

To sum up, the structure of the motor driving device of the present application makes replacement of the capacitor module20relatively simple without using specific tools as mentioned in the background section. The capacitor module20can be easily detached from the first compartment15and then be replaced when the capacitor22are broken or malfunctioned.