MotiraTech engineers and integrates gearless PMDD drive systems for conveyors and continuous-duty industrial equipment — application assessment, specification, retrofit and new-build coordination, commissioning and technical support.
Direct drive is an architecture decision, not a product swap. We assess each application on its duty, mechanical interface and electrical infrastructure, and we say so when a conventional drive-train remains the correct answer.
A PMDD system replaces the motor-and-reducer chain with a low-speed, high-torque permanent magnet motor operating under variable-frequency control, coupled directly to the driven shaft.
Torque is converted mechanically inside the reducer.
Torque is produced at process speed by the machine itself.
Removing the reducer stage removes its couplings, its alignment interfaces and its gear-oil system from the drive path. What remains is a machine that turns at the speed of the driven equipment, controlled electrically rather than geared mechanically.
Four characteristics define the architecture, and each of them changes how the drive is specified, mounted and controlled.
A permanent magnet motor is wound with a high pole count so it develops rated torque at the low rotational speed the driven equipment actually needs. There is no mechanical speed conversion stage between motor and shaft.
Rotor flux comes from permanent magnets rather than induced rotor current, so the rotor does not rely on slip to produce torque. Machine behaviour and thermal loading therefore differ from an equivalent induction machine.
A PM motor operates under variable-frequency control across its full range. Ramp profiles, torque limits and load sharing between multiple drive units are configured in the drive rather than in mechanical hardware.
Removing the reducer and its couplings removes their alignment, lubrication and wear interfaces. The trade is a heavier, larger-diameter machine and a stiffer structural and electrical interface to design for.
The schematic below traces the power path from supply through the drive to the driven shaft, for both architectures. Both are valid; the correct choice depends on the duty, the interface and the site.
Reducing the number of mechanical elements in the torque path removes their associated wear, alignment and lubrication interfaces. The resulting availability, maintenance and energy outcomes for a given asset are established from its own installation, duty cycle and operating data during application engineering.
Only the characteristics that follow from the architecture itself. No performance figures are stated, and direct drive is not the correct answer in every installation.
Continuous-duty, low-speed, high-torque equipment in mining, bulk handling and heavy industry — where the drive-train governs production availability.
Direct drive motors, integrated drive units and the associated control and power equipment supplied as part of a PMDD package. Ratings, frame sizes and interfaces are selected per application; product data is issued during technical review.
A permanent magnet direct drive motor intended for low-speed, high-torque industrial equipment. The skid-mounted frame supports installation alignment at the drive location.
Core value
Delivers torque directly to the load, reducing the number of mechanical transmission interfaces.
The drive-end arrangement combines the output shaft and mounting flange that connect the motor directly to the driven equipment.
Core value
Provides a direct mechanical interface for the driven shaft, flange and application-specific coupling arrangement.
A framed permanent magnet motor with an integrated terminal enclosure for connection to the drive and site electrical system.
Core value
Combines the motor, terminal access and mounting envelope in one application-selected drive package.
A compact drive unit with a flanged output interface, intended for equipment where a coordinated mechanical and electrical package is required.
Core value
Simplifies the drivetrain interface between the permanent magnet motor and the driven equipment.
Drive cabinets provide the power electronics, protection and control functions required to operate the permanent magnet motor.
Core value
Enables controlled motor starting, speed regulation and integration with the site control system.
Motor control cabinets with operator interfaces for drive supervision, commissioning, status indication and site operating functions.
Core value
Gives operators and commissioning personnel direct access to drive status, controls and operating information.
A horizontally mounted permanent magnet motor supplied on a fabricated skid base with terminal enclosure and shaft output for connection to the driven equipment.
Core value
Provides a pre-aligned mounting arrangement that simplifies installation at the drive location.
A foot-mounted permanent magnet motor installed on a concrete foundation, with drive-end flange, output shaft and separate terminal and instrumentation enclosures.
Core value
Suits fixed-plant installations where the drive is set on a prepared foundation.
A vertically arranged direct drive assembly with a downward output shaft, mounted on a structural base for equipment driven from above.
Core value
Supports vertical-shaft equipment without an intermediate right-angle transmission stage.
A vertical permanent magnet motor mounted on a pedestal support with a spider-type mounting frame and side terminal box.
Core value
Keeps the drive footprint compact where floor or platform space is limited.
A conveyor pulley with the drive integrated into the drum assembly, combining the lagged drum, bearing arrangement and drive housing in one unit.
Core value
Removes the external gearbox and coupling arrangement from the conveyor drive head.
A large square-frame permanent magnet motor with a flanged drive end, intended for grinding and heavy rotating equipment duties.
Core value
Delivers high torque at mill operating speed through a single direct mechanical interface.
A grinding mill shown with a direct drive arrangement at the drive end, illustrating how the motor integrates with the mill trunnion and support structure.
Core value
Shows the installed drive interface used when a mill is converted to or specified with direct drive.
A permanent magnet motor coupled directly to an industrial fan impeller, arranged for ventilation and air-handling duties.
Core value
Allows fan speed to be set electrically instead of through belts, pulleys or dampers.
Supporting site power equipment that can be coordinated with a PMDD package for locations requiring local electrical power.
Core value
Supports drive commissioning and operation where site utility power is unavailable or not yet established.
Send the application information and we will issue the matching product documentation.
Published design envelopes for variable-frequency permanent magnet electric drum pulleys. Mining explosion-proof and non-explosion-proof variants exist in each cooling arrangement. Final ratings are confirmed against the conveyor duty.
Beyond conveyor drives, permanent magnet direct drive machines are built for marine propulsion, shaft generation and continuous process equipment. The ranges below are the published product envelopes for those duties.
Permanent magnet synchronous motors in this range hold China Classification Society (CCS) type approval for shipboard service, covering main propulsion motors and deck machinery motors.
Certification is held by the equipment manufacturer. MotiraTech does not issue classification-society approvals; certificate scope is verified per project.
In pulp, paper and comparable process plants, permanent magnet direct drive replaces motor-and-reducer sets on continuous rotating equipment.
Both routes are supported. The engineering effort sits in different places.
Replacing an existing motor-and-reducer arrangement on an installed asset. The constraint is the existing structure, shaft interface, electrical capacity and the available shutdown window.
Specifying direct drive from the design stage, where the structure, electrical infrastructure and control philosophy can be built around the drive rather than adapted to it.
Send what is available. A first technical position can usually be formed from duty, shaft data and the existing drive arrangement; the remainder is needed before a firm scope or quotation.
Our engineering team will review the data and respond with a technical position on suitability and scope.
One engineering team carries the PMDD application from technical review through commissioning and ongoing support.
Review of duty, load data and site constraints to establish whether direct drive is technically appropriate for the asset.
Motor and drive specification, mechanical interface concept, electrical scope definition and interface documentation.
Manufacturing coordination, factory testing witness, documentation control and delivery to site.
Installation method, alignment and mounting support, and coordination with the site mechanical and electrical crews.
Drive parameterisation, protection settings, load testing, torque-sharing setup and handover documentation.
Post-commissioning support, spares planning, condition-monitoring advice and remote or on-site field assistance.
Motor ratings, torque and speed envelopes, enclosure and cooling arrangements, environmental limits and any third-party certification are confirmed per application against manufacturer documentation. No product data sheets or certification claims are published on this page, and none are implied.
Existing MotiraTech technical material on direct drive and drive-train selection.
No downloadable PMDD datasheets are currently published. Application-specific documentation is issued directly during technical review.
Send us the operating and equipment information. Our team can review the application and determine whether a PMDD architecture is appropriate.
