{"id":3277,"date":"2022-06-04T11:23:23","date_gmt":"2022-06-04T02:23:23","guid":{"rendered":"https:\/\/ah-motorlab.com\/business\/"},"modified":"2022-06-08T17:57:07","modified_gmt":"2022-06-08T08:57:07","slug":"business","status":"publish","type":"page","link":"https:\/\/ah-motorlab.com\/en\/business\/","title":{"rendered":"Business"},"content":{"rendered":"

[vc_row full_width=”stretch_row” css=”.vc_custom_1654310231907{background-image: url(https:\/\/ah-motorlab.com\/wp\/wp-content\/uploads\/2021\/10\/ss.jpg?id=250) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}”][vc_column][vc_empty_space height=”50px”][\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”Development of next-generation switched reluctance motor” font_container=”tag:h2|font_size:25|text_align:left|color:%236ec1e4″ use_theme_fonts=”yes”][\/vc_column][\/vc_row][vc_row][vc_column css=”.vc_custom_1654312234448{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_custom_heading text=”History of switched reluctance motor(SRM)” font_container=”tag:h3|font_size:20|text_align:left|color:%23888888″ use_theme_fonts=”yes” el_class=”bold”]

<\/div>
<\/div>
1838<\/div><\/div>

The world’s first switched reluctance motor
\nR. Davidson (UK) made an electric locomotive driven by SRM. Test run on the Falkirk Railroad.<\/p>\n<\/div><\/div><\/div>

<\/div><\/div>
<\/div>
1850~1860<\/div><\/div>

P.G.Froment(France) made SRM for printing press<\/p>\n<\/div><\/div><\/div>

<\/div><\/div>
<\/div>
1851<\/div><\/div>

Page ran a locomotive at 30km\/h on the Baltimore and Ohio Railroad with a 16hp SR motor.<\/p>\n<\/div><\/div><\/div>

<\/div><\/div>
<\/div>
1969<\/div><\/div>

S.A.Nasar proposed the name Switched Reluctance Motor.<\/p>\n<\/div><\/div><\/div>

<\/div><\/div>
<\/div>
1980s<\/div><\/div>

Started full-scale development and started to be used in products (variable speed operation by inverter)<\/p>\n<\/div><\/div><\/div>

<\/div><\/div><\/div>
<\/div>[\/vc_column][\/vc_row][vc_row full_width=”stretch_row” css=”.vc_custom_1654311433701{background-color: #eeeeee !important;}”][vc_column css=”.vc_custom_1654312161852{padding-bottom: 30px !important;}”][vc_custom_heading text=”Current status of switched reluctance motor” font_container=”tag:h3|font_size:20|text_align:left|color:%23888888″ use_theme_fonts=”yes” el_class=”bold”][vc_column_text]With the rapid shift to electric vehicles, permanent magnet synchronous motors are expected to face challenges in the future, such as the cost of permanent magnets and the stable supply of rare earths. As an alternative motor to permanent magnet synchronous motor, switched reluctance motor has a simple structure and high output density. However, at present, it is difficult to use switched reluctance motors for traction motors because of the following issue.[\/vc_column_text][vc_row_inner equal_height=”yes” content_placement=”top” css=”.vc_custom_1654312087490{padding-right: 10% !important;padding-left: 10% !important;}”][vc_column_inner width=”1\/2″ css=”.vc_custom_1654312193326{margin-right: 10px !important;margin-left: 10px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;background-color: #ffffff !important;}”][vc_custom_heading text=”Inverter cost increase” font_container=”tag:h4|font_size:20|text_align:center|color:%231e73be” use_theme_fonts=”yes” css=”.vc_custom_1654312521542{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 5px !important;padding-bottom: 10px !important;}” el_class=”bold”][vc_custom_heading text=”Compared to conventional 3-phase inverter, more diodes are required and the wiring capacity is large due to the low power factor.” font_container=”tag:p|font_size:16|text_align:left|color:%231e73be” use_theme_fonts=”yes”][\/vc_column_inner][vc_column_inner width=”1\/2″ css=”.vc_custom_1654312205977{margin-right: 10px !important;margin-left: 10px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 15px !important;padding-left: 20px !important;background-color: #ffffff !important;}”][vc_custom_heading text=”Noise and vibration” font_container=”tag:h4|font_size:20|text_align:center|color:%231e73be” use_theme_fonts=”yes” css=”.vc_custom_1654312527453{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 5px !important;padding-bottom: 10px !important;}” el_class=”bold”][vc_custom_heading text=”Due to its structure, torque ripple is larger than that of a permanent magnet motor.” font_container=”tag:p|font_size:16|text_align:left|color:%231e73be” use_theme_fonts=”yes”][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row full_width=”stretch_row” css=”.vc_custom_1654312609835{background-color: #ffffff !important;}”][vc_column css=”.vc_custom_1654312161852{padding-bottom: 30px !important;}”][vc_row_inner][vc_column_inner width=”2\/3″][vc_custom_heading text=”Development of next-generation switched reluctance motor” font_container=”tag:h3|font_size:20|text_align:left|color:%23888888″ use_theme_fonts=”yes” el_class=”bold”][vc_empty_space][vc_column_text]With the rapid shift to electric vehicles, permanent magnet synchronous motors are expected to face challenges in the future, such as the cost of permanent magnets and the stable supply of rare earths. As an alternative motor to permanent magnet synchronous motor, switched reluctance motor has a simple structure and high output density. However, at present, it is difficult to use switched reluctance motors for traction motors because of the following issue.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/3″][vc_single_image image=”1623″ img_size=”230×230″ alignment=”center”][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle”][vc_column_inner width=”1\/2″][vc_custom_heading text=”12\/10type hex connection SRM” font_container=”tag:h4|font_size:18|text_align:left” use_theme_fonts=”yes” el_class=”bold”][vc_column_text]The new SRM has a centrally wound 6-phase coil in stator A-F phase, with two coils of the same phase in parallel. The beginning\/end of the winding of each layer coil is connected to the coils of the two adjacent phases, and we call this “hex connection” because the wiring takes the shape of a hexagon.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”3449″ img_size=”300×300″ alignment=”center” css=”.vc_custom_1654489285047{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”][vc_column_text css=”.vc_custom_1654314412483{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”]<\/p>\n

Fig. 1. Cross-sectional view of 6-phase 12\/10type SRM<\/p>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle” css=”.vc_custom_1654314716193{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_column_inner width=”1\/2″][vc_custom_heading text=”Connection of a conventional 6-phase inverter” font_container=”tag:h4|font_size:18|text_align:left” use_theme_fonts=”yes” el_class=”bold”][vc_column_text]Fig. 2 shows the drive circuit of a conventional 6-phase inverter. The 6-phase inverter consists of 6 bridges, and each bridge has a total of 12 switching elements in the upper and lower stages. Due to the large number of switching elements used, the high cost of the inverter has been an issue.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”1613″ img_size=”full” alignment=”center” css=”.vc_custom_1654314523240{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”][vc_column_text css=”.vc_custom_1654314402558{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”]<\/p>\n

Fig. 2. Conventional 6-phase inverter<\/p>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle” css=”.vc_custom_1654314722154{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_column_inner width=”1\/2″][vc_custom_heading text=”Connection with 9-switch Inverter” font_container=”tag:h4|font_size:18|text_align:left” use_theme_fonts=”yes” el_class=”bold”][vc_column_text]This is why the 9-switch inverter shown in Fig. 3 was developed. Each of the three bridges has three switching devices connected in series. This allows the number of switching elements to be reduced from 12 to 9.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”1615″ img_size=”full” alignment=”center” css=”.vc_custom_1654314578455{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”][vc_column_text css=”.vc_custom_1654314585476{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”]<\/p>\n

Fig. 3. 9-switch inverter<\/p>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle” css=”.vc_custom_1654314727393{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_column_inner width=”1\/2″][vc_custom_heading text=”Connecting a 9-switch inverter with a hex connection” font_container=”tag:h4|font_size:18|text_align:left” use_theme_fonts=”yes” el_class=”bold”][vc_column_text]Furthermore, compared to the conventional star connection, the use of hex connection as shown in Fig. 4 reduces the torque ripple and increases the torque density, and the combination of 9-switch inverter and hex connection results in a SRM with better operating characteristics than before.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”1609″ img_size=”full” alignment=”center” css=”.vc_custom_1654314626149{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”][vc_column_text css=”.vc_custom_1654314633129{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”]<\/p>\n

Fig. 4. 9-switch inverter and hex connection<\/p>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle” css=”.vc_custom_1654314733130{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_column_inner width=”1\/2″][vc_custom_heading text=”Connection with improved 9-switch inverter” font_container=”tag:h4|font_size:18|text_align:left” use_theme_fonts=”yes” el_class=”bold”][vc_column_text]The switching pattern when using the circuit in Fig. 4 to drive a 12\/10type SRM with pulsed voltage is<\/p>\n

– Right column switch ON \/ Middle column switch OFF \/ Left column switch OFF<\/p>\n

– Right column switch OFF\/Middle column switch OFF\/Left column switch ON<\/p>\n

Middle column switch are always open.<\/p>\n

Therefore, as shown in Fig. 5, in the improved 9-switch inverter, all the switching elements in the middle row are replaced with diodes, enabling cost and size reduction while maintaining equivalent performance.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_single_image image=”1611″ img_size=”full” alignment=”center” css=”.vc_custom_1654314672524{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”][vc_column_text css=”.vc_custom_1654314685209{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}”]<\/p>\n

Fig. 5. Improved 9-switch inverter and hex connection<\/p>\n

[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner][vc_custom_heading text=”Improvements” font_container=”tag:h4|font_size:18|text_align:left|color:%231e73be” use_theme_fonts=”yes” el_class=”bold”][vc_message message_box_color=”sky” icon_fontawesome=”fas fa-check”]The number of diodes has been reduced from 6 to 3 compared to the conventional 3-phase asymmetric inverter, enabling cost and size reductions.[\/vc_message][vc_message message_box_color=”sky” icon_fontawesome=”fas fa-check”]Hex connection eliminates the need for a neutral point, reducing the height of the coil end.[\/vc_message][vc_message message_box_color=”sky” icon_fontawesome=”fas fa-check”]Increased torque density.[\/vc_message][vc_message message_box_color=”sky” icon_fontawesome=”fas fa-check”]Reduced torque ripple.[\/vc_message][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row][vc_column css=”.vc_custom_1654312234448{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_custom_heading text=”Prospects for next-generation switched reluctance motor” font_container=”tag:h3|font_size:20|text_align:left|color:%23888888″ use_theme_fonts=”yes” el_class=”bold”][vc_raw_html]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[\/vc_raw_html][vc_column_text]<\/p>\n

To the next-generation SRM<\/p>\n

[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_empty_space height=”50px”][\/vc_column][\/vc_row]<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"

[vc_row full_width=”stretch_row” css=”.vc_custom_1654310231907{background-image: url(https:\/\/ah-motorlab.com\/wp\/wp-content\/uploads\/2021\/10\/ss.jpg?id=250) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}”][vc_column][vc_empty_space height=”50px”][\/vc_column][\/vc_row][vc_row][vc_column][vc_custom_heading text=”Development of next-generation switched reluctance motor” font_container=”tag:h2|font_size:25|text_align:left|color:%236ec1e4″ use_theme_fonts=”yes”][\/vc_column][\/vc_row][vc_row][vc_column css=”.vc_custom_1654312234448{padding-top: 20px !important;padding-bottom: 20px !important;}”][vc_custom_heading text=”History of switched reluctance motor(SRM)” font_container=”tag:h3|font_size:20|text_align:left|color:%23888888″ use_theme_fonts=”yes” el_class=”bold”][\/vc_column][\/vc_row][vc_row full_width=”stretch_row” css=”.vc_custom_1654311433701{background-color: #eeeeee !important;}”][vc_column css=”.vc_custom_1654312161852{padding-bottom: 30px !important;}”][vc_custom_heading text=”Current status of switched reluctance motor” font_container=”tag:h3|font_size:20|text_align:left|color:%23888888″ use_theme_fonts=”yes” el_class=”bold”][vc_column_text]With the rapid shift to electric vehicles, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/pages\/3277"}],"collection":[{"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/comments?post=3277"}],"version-history":[{"count":22,"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/pages\/3277\/revisions"}],"predecessor-version":[{"id":3591,"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/pages\/3277\/revisions\/3591"}],"wp:attachment":[{"href":"https:\/\/ah-motorlab.com\/en\/wp-json\/wp\/v2\/media?parent=3277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}