Part 4 - What are DC controllers ?

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The types of controllers covered are for DC series-wound motors and AC motors. The major manufacturers this year are Alltrax, Cafe Electric and Curtis for DC systems. Major manufacturers for AC drives are AC Propulsion with many up and coming competitors.

On a DC Controller varying width pulses of electricity are sent to the motor depending on throttle position.
In the image, A would be near full power, B would be a modest power level and C would be a low power level.
On AC Controllers the frequency of the AC sine wave vary with the motors speed.

The following controllers are available on the market:

Zilla – Regarded as the Best available in either 1000A or 2000A, available in 156, 300 or 336 volt models, water cooled, price range is ~$2,000 - $5,000, hold numerous world speed records for EV’s, Silent Operation.

Cutris: many sizes available from 24V-144V 500A. Simple to hook up needs heatsink and fan, price range is $1,675 for 500A 144V. It can’t be used on anything larger than a 9” motor.

Kelly Controllers - $1,395 for 144V 650A. Option for regenerative braking. There have been several reports on the EV List of these controllers failing; however, the company has been good on warranty replacements.

Logisystems Controllers: 72V – 156V, 550A – 1000A, 156V 550A ~$1345, heatsink built In, Logisystems used to rebuild and beef up Curtis Controllers.

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