Every week, someone calls our shop in Trenton with the same question asked three different ways. The elevator motor is acting up, or it has stopped entirely, and they want to know the one thing that matters: can this be fixed, or are we buying a new machine?
Here is the honest answer from a shop that makes its living both ways. Most elevator motors can be repaired or rewound for far less than the cost of replacement, and some should not be. The trick is knowing which situation you are in before anyone quotes you anything. This guide walks through how we make that call on our own shop floor.
Start With the Symptoms, Not the Sales Pitch
An elevator motor rarely dies without warning. In our experience, the machines that arrive on our dock told their owners for months that something was wrong. The warnings tend to fall into three groups.
Electrical symptoms. Tripped breakers, blown fuses, a motor that hums but will not start, or a machine that runs hot enough to smell. These usually trace back to the windings or the insulation. A burnt armature has a distinct odor that any veteran mechanic recognizes instantly, and once you have smelled it, you never forget it.
Mechanical symptoms. Vibration, bearing noise, brush chatter, or visible sparking at the commutator. These often start small and grow. Sparking in particular deserves immediate attention, because an arcing commutator chews through brushes and can flash over into a much bigger failure.
Performance symptoms. The car levels poorly, starts sluggishly, or trips out under load. Sometimes this is the controller or the drive, but the motor is a frequent culprit, especially in older DC machines where decades of carbon dust have quietly degraded the insulation.
None of these symptoms tells you on its own whether the motor needs a cleaning, a rewind, or a replacement. That answer comes from testing.
What Proper Testing Reveals
Before we recommend anything, we electrically test the armature, the field coils, and the interpoles, and we record the readings. Insulation resistance values, winding resistance balance, and surge comparison results tell us whether the insulation system is healthy, degrading, or gone. This matters for two reasons.
First, it separates the cheap problems from the expensive ones. A machine with strong insulation readings but heavy carbon contamination usually needs our motor cleaning and maintenance service, not a rewind. That is a fraction of the cost, and any shop that quotes you a full rebuild without showing you test data should make you suspicious.
Second, recorded test data creates a baseline. When we service a machine annually, the year over year trend tells us when a motor is beginning to fail long before it actually does, which lets a building schedule the work instead of suffering it.
The industry has real standards for this work. The Electrical Apparatus Service Association publishes recognized good practice for motor repair and rewinding, and the EASA standard is the benchmark we hold our own winding room to. Elevator equipment itself falls under the ASME A17.1 safety code, maintained by ASME, which governs how elevator machines are maintained and altered. A repair vendor should be fluent in both worlds.
When a Rewind Is the Right Call
Motor rewinding replaces the copper windings and the insulation system while keeping the machine’s core, shaft, frame, and mechanical identity intact. It is the right answer far more often than most building owners expect, and here is why.
Elevator motors, especially the gearless machines and motor generator sets built in the middle of the last century, were manufactured with iron and copper at a quality level that is genuinely hard to buy today. The core of a seventy year old gearless machine is often in better metallurgical shape than a new import. When we rewind that machine with modern Class F insulation materials, the result frequently outperforms the original specification, because the insulation technology of today is dramatically better than what the factory had available.
A rewind makes sense when the mechanical parts are sound, when the machine is obsolete and a drop in replacement does not exist, and when downtime matters, since a rewind of a known machine is usually faster than sourcing, engineering, and installing a replacement. Our elevator motor repair and rewinding services cover AC and DC machines from fractional horsepower to 800 HP, and the obsolete machines other shops decline are a specialty of ours, not an inconvenience.
When Replacement Deserves a Look
We will also tell you when fixing the old machine is the wrong investment. Replacement is worth serious consideration when the core iron itself is damaged, when the machine has suffered repeated failures that point to a design mismatch with its current duty, or when a modernization project is already going to replace the drive system around it. A motor is one component in a system, and there are projects where rewinding a machine that the modernization will orphan two years later simply wastes money.
When replacement is the answer, we can usually still shorten the path. Our warehouse stocks rebuilt hoist motors and built armatures for a wide range of elevator applications, and a rebuilt exchange unit that ships immediately can turn a multiweek outage into a short one.
The Economics, Plainly
People searching for motor rewinding cost want a number, so here is the honest framing instead of a false one. A rewind typically runs a fraction of the cost of a comparable new machine, and for obsolete elevator equipment there is often no comparable new machine at any price, which makes the comparison academic. The real cost question is downtime. A dark elevator in an occupied building costs money and goodwill every single day, which is why the speed of the repair path and the availability of exchange inventory matter as much as the invoice.
Get the machine tested, get the data explained to you in plain language, and get a recommendation from a shop that profits either way and therefore has no reason to steer you. That is the whole method.
Talk to the People Who Will Actually Do the Work
Electrical Motor Repair Co. has been repairing, rewinding, and rebuilding elevator motors from our shop at 809 East State St. in Trenton, New Jersey for generations of building owners and elevator contractors, and we serve customers nationwide. Call us at (609) 392 6149, day or night, or request a repair quote and we will tell you what your machine actually needs.
Frequently Asked Questions
Electrical testing gives the answer. If the core iron is undamaged and the mechanical components are sound, the windings and insulation can almost always be replaced, restoring the motor to original specification or better. Testing the armature, field coils, and interpoles takes far less time than sourcing a replacement machine.
In most cases, yes, and often dramatically so. For obsolete elevator machines, rewinding is frequently the only practical option, because equivalent new machines are no longer manufactured. The larger cost consideration is usually elevator downtime, which favors whichever path returns the car to service fastest.
It depends on the machine’s size, construction, and condition, which is why we quote turnaround with the machine in front of us or with detailed information in hand. Exchange inventory can shorten outages substantially, since a rebuilt motor from stock can ship while your original is being serviced.
The most common paths are insulation breakdown from age and contamination, overloading, single phasing on AC machines, and conductive carbon dust accumulating inside DC machines. Regular cleaning and periodic electrical testing catch most of these conditions before they become failures.