Adjusto-Spede Motor Repair Services in Michigan

A&C Electric provides Adjusto-Spede motor repair to companies in Michigan, Indiana and Ohio. We work with DSI Dynamatic, Eaton and Louis Allis drives, offering quick diagnostics and in-house service capabilities for every model. Contact us today for a quote on Adjusto-Spede motors across the Midwest.

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How Adjusto-Spede Drives Work

Adjusto-Spede Drives use an air-cooled, adjustable speed clutch paired with a NEMA B AC induction motor to deliver constant torque across a variable speed range. There’s no physical contact between input and output, which helps reduce wear and extend motor life.

Each drive includes:

• TEFC construction and C-Face endbells
• Internal tachometer generator for real-time feedback
• DC excitation to the clutch coil via the controller

Speed is regulated by comparing the tachometer signal to a reference point within the controller. This feedback loop produces smooth response with reduced shock loading—ideal for high-inertia loads and precision industrial motor control.

Adjusto-Spede systems deliver a 34:1 speed range at 250% rated torque, making them ideal for high-load startups. Because Adjusto-Spede drives differ significantly from standard motor types, they require specialized knowledge and equipment. A&C Electric technicians have decades of experience repairing industrial electric motors and strive to save customers money by reducing lead time and spare motor costs.

Variable Speed Drive Models We Service

• AS & FAS Drives: Smooth, Compact Speed Control

  Dynamatic AS and FAS drives offer tight speed control with simple drop-in installation, especially in fractional horsepower ranges.

  • Available in 1/4 to 1.5 HP units
  • Compatible with single or three-phase power
  • 34:1 speed range and 250% rated motor torque
  • Built with permanently lubricated bearings and C-face mounts
  • Matches overload requirements and existing wiring
  • No special training or wiring changes required

• AT Drives: Built for Stamping Presses

  Originally engineered for press applications, AT drives provide rugged performance and consistent torque under changing loads.

  • 1–200 HP capacity with tachometer feedback
  • Speed control within 0.5% from no load to full load
  • 250% rated torque for high-inertia startups
  • Minimal harmonics with low-maintenance design
  • Small controller footprint with PLC compatibility
  • Used in presses, kilns, bitumen pumps and cold feed bins

• DCD Drives: Low-Maintenance in Harsh Conditions

  DCD drives combine durability with simplicity for demanding environments like mining and asphalt processing.

  • Air-cooled, adjustable speed clutch with AC induction motor
  • Self-cleaning rotor for dust and debris resistance
  • 250% startup torque and consistent speed regulation
  • TEFC design with no routine maintenance
  • Drop-in NEMA and IEC motor frame compatibility
  • Reliable performance in conveyor and aggregate systems

  Our team repairs and refurbishes Adjusto-Spede industrial motors using precision tools, proper handling techniques and decades of hands-on experience. Each motor is returned quickly and at a significantly lower cost than replacement.

Contact A&C Electric for expert Adjusto-Spede repair in Michigan and surrounding states.

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Ship Your Item To A&C Electric

A&C Electric Certified Technicians Dismantle Your Product

A&C Electric Sends you a Quote for Approval of Repair

Motor is rebuilt and shipped back to you ASAP

Dynamatic Adjusto-Spede Repair Capabilities

We have documented 10,000 repair reports in our Database spanning across 50 different manufacturers

We repair A.C. Motors, D.C. Motors, Servo Motors, Press Drives, Gearboxes, and Spindles

Capable of 24-hour repairs in many cases

We have thousands of spare and rebuilt motors in our inventory for parts or exchange motors

Dynamatic Adjusto-Spede Repair Procedures

Data

Motor nameplate data is recorded

Inspection

A visual inspection of any damage to the motor.

We check for

• Damaged Leads/Terminals
• Worn output shaft/keyways
• Cracks in end bells or covers

Job Ticket

We complete to full write up off all motor data

Including

• All winding tests (Resistance, Meg Ω, Continuity) on the stator and clutch coil
• All bearing sizes
• All seal sizes
• Brake torque tests (Record Torque, winding resistance)
• Feedback Tests (Tachometer/Encoder)

Motor Disassembly

• Bearing and seal sizes are recorded (motor and clutch)
• Bearing fits are measured on shaft and End bell
• Brake torque is measured as well as resistance and Meg Ω
• More winding tests are performed (Surge and HiPOT tests) on the motor and clutch coil
• Stator is then washed and baked in oven (or burned out if required)
• Magnets are inspected for cracks or if loose on shaft
• Clutch housing is resleeved if required

Assembly

• New bearings are installed
• New seals are installed
• If required, new windings are impregnated
• New brushes are installed
• Brakes are rebuilt or replaced depending on manufacturer design.

Rotor Balancing and Testing

• Rotor is run through a full vibration diagnostic

Run Testing

• Every Motor is Run for a minimum of 1 hour using one of our drives.
• We use Siemens S110, S120, IndraDrive, AB Kinetix 300, Yaskawa 7, and AMC drives

Service Report

• A Final 3-page Service Report is filled out
• Pinout diagram for power and feedback is provided
• Brake torque is recorded a final time for our Service Reports
• A photo of nameplate and motor is attached
• A motor tag is installed on motor with QR code linking Service Report and Job Histories
• If requested, a YouTube link is attached to the service report of motor