High Voltage Motors

AC Hargreaves specialises in the repair, rewind, and overhaul of high voltage motors, delivering precision-engineered solutions to ensure maximum reliability and performance. Our modern workshop is fully equipped to handle large motor repairs, high voltage testing, condition monitoring, and dynamic balancing.

Large industrial machine being lifted by crane inside warehouse, with workers in safety gear.

Industry-Leading Expertise & Facilities

With decades of experience and a team of dedicated specialists, AC Hargreaves is committed to delivering the highest standards of workmanship. Our purpose-built facility is designed to handle the most demanding high voltage motor applications, from routine maintenance to complex overhauls. Equipped with advanced testing and diagnostic tools, we ensure every motor we service operates at peak efficiency, minimising downtime and maximising performance. Our ISO 9001 accreditation reflects our dedication to quality, ensuring all work is carried out to the highest industry standards.

Close-up of an electric motor stator showing copper windings and insulation.

Key Capabilities

  • High-capacity overhead cranes: 32-tonne, 20-tonne, 10-tonne, and 6.3-tonne high-lift cranes for safe and efficient handling
  • Specialist facilities: Dry-out oven, burn-out oven, and a fully equipped testing laboratory
  • Capable of rewinding motor stators and rotors up to 30 MW & 13.8 kV
  • Testing facilities include Winding & insulation resistance, Polarisation Index, Surge, Elcid, Tan Delta, Partial Discharge, and DC Over Voltage testing
  • In-house balancing of rotors and armatures up to 10 tonnes, certified to ISO G1 & ISO G2.5
  • Core loss testing: Ensuring optimal efficiency in stator rewinds

Workshop & Product Gallery

Close-up of an industrial motor rotor and stator with visible coils.
Industrial machinery component with metal coils and bolts
Close-up view of an industrial motor stator with copper winding coils visible.
Close-up view of a motor or generator stator coil winding, showcasing intricate wiring and structure.
Industrial electric motor rotor with copper windings and metal shaft.
Large industrial machine with chains in a warehouse
Electric motor stator with copper windings in a workshop setting.
Electric motor stator being wound in an industrial workshop
A large industrial oven with a round metal component inside, surrounded by yellow clamps, used for manufacturing or repair.
Close-up of an industrial red machine component with layered coils and metal fittings inside, possibly an electric motor or generator component in a manufacturing setting.
Red industrial machinery component with visible coils, possibly part of a large motor or generator system, on a workshop floor.
Industrial equipment repair, featuring a large cylindrical electrical rotor wrapped with copper coils and wires, resting on a workshop floor.
A large industrial machine component with exposed wiring and insulation in a workshop setting.
Close-up of a red industrial motor stator with white winding coils.
Close-up of an industrial electric motor rotor with windings and red core.
Close-up of an electric motor or generator stator winding with copper coils and insulated cables.
Close-up of an industrial motor stator with exposed copper windings and a blue outer frame.
Close-up of a stator winding in an electric generator, showing copper coils and insulation layers.
Close-up of a red industrial motor stator with visible copper windings and electrical wiring.
Industrial electric motor stator with copper windings and red housing
iTIG winding analyzer displaying various voltage and resistance readings with buttons and dials on the control panel.
Large industrial rotor with copper windings and fins in a workshop setting
Person working inside an electric motor stator with visible coils.
Close-up of an electric motor stator with coils
Large industrial equipment being installed or maintained in a facility, with workers in safety vests and equipment suspended by chains.
Close-up view of the winding inside an electric motor stator
Close-up of a winding in an electric motor or generator.
Three large industrial motor rotors with orange-red coil windings are aligned on a workshop floor.
Large industrial generator rotor with orange cooling fins and copper windings, mounted on a blue support structure.
Interior of a large industrial motor or generator with copper windings.
Industrial electric motor rotor with a visible copper coil and mechanical components, partially disassembled in a workshop setting.
Industrial electric generator, teal color, in a workshop setting.
Large industrial electric motor rotor being repaired in a workshop.
Worker securing large blue industrial equipment on a crane truck.
Industrial red machinery components with circular coils in a workshop setting.
A large industrial machine, possibly a generator or motor, being lifted by a white mobile crane inside a warehouse environment. The machine is blue and secured with straps. Two people are observing from a distance. The warehouse has metal beams and a
Large green industrial machine inside a warehouse
Red industrial equipment covered in plastic labeled "SYNC #3" and bound by chains inside a building.
Industrial setup with an open electric motor stator, diagnostic equipment, and control panel in a workshop environment.