I use this code in PHP:
$idcat = 147;
$thumbnail_id = get_woocommerce_term_meta( $idcat, \'thumbnail_id\', true );
$image = wp_get_attachment_url( $thumbnail
Use this code this may help you.i have passed the cat id 17.pass woocommerce cat id and thats it
prefix . "woocommerce_termmeta";
$query="SELECT meta_value FROM {$table_name} WHERE `meta_key`='thumbnail_id' and woocommerce_term_id ={$cat_id} LIMIT 0 , 30";
$result = $wpdb->get_results($query);
foreach($result as $result1){
$img_id= $result1->meta_value;
}
echo '
';
?>