i found 1 way
$site = new-object Microsoft.SharePoint.SPSite("http://server/")
$web = $site.OpenWeb("/")
$resultsPath = "Paginas/default.aspx"
$page = $web.GetFile($resultsPath)
$page.CheckOut()
$wpm = $web.GetLimitedWebPartManager($resultsPath, [System.Web.UI.WebControls.WebParts.PersonalizationScope]::Shared)
$wpm.WebParts | ft Title, StorageKey
$refinerManager = $wpm.WebParts | Where-Object {$_.Title -eq "WP_IntegracaoLumis"}
Write-Host $refinerManager
$refinerManager.Tipo= "DEFAULT 2"
$wpm.SaveChanges($refinerManager) #ERROR
write-Host
Write-Host "WebPart em $resultsPath Alterada"
$page.CheckIn("Test")
$page.Publish("Test")
$web.Close()
$site.Close()