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Motor Information. HOUSINGS. Shown on the next several slides are a sample of some of the motor housings or enclosures that are available. This is by no means exhaustive. OPEN – Air Over – A.O. Ex.: Furnace Fan. Totally Enclosed – Water Proof Ex.: Outdoor Condenser. Totally Enclosed

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housings

HOUSINGS

Shown on the next several slides are a sample of some of the motor housings or enclosures that are available. This is by no means exhaustive.

slide4

Totally Enclosed – Water Proof

Ex.: Outdoor Condenser

slide5

Totally Enclosed

Hazardous Location

single phase motor types

Single Phase Motor Types

Split Phase

Shaded Pole

(PSC) – Permanent Split Capacitor

(CS) – Capacitor Start

(CSR) – Capacitor Start Run

three phase motor types

Three Phase Motor Types

Delta Configuration

Wye Configuration

dc motor that works on ac

DC Motor that works on AC

Known as a ‘Universal’ motor because it can work on AC or DC. It has some unique characteristics that we will review later in the course.

starting devices

Starting Devices

All of the following devices are used with single phase motors.

Centrifugal Switch

Hot Wire Relay – no longer used

Current Relay

Solid State Relay

Potential Relay

starting devices1

Starting Devices

Three phase motors are ‘self starting’ and do not require a ‘starting relay.’ Because of this, they are easier to troubleshoot.

motor compressor configurations

Motor/Compressor Configurations

The HVACR industry uses compressors which require a motor to drive the compressor. Therefore, there are three configurations.

1 hermetic

1. Hermetic

The word hermetic means ‘sealed.’ So both the motor and the compressor share the same shaft and they are both put in a housing and welded closed, thus ‘sealed.’ They are sometimes referred to as a ‘tin can’ or ‘welded’ compressor.

2 semi hermetic sometimes referred to as semi open

2. Semi-Hermetic(sometimes referred to as semi-open)

The motor and the compressor share the same shaft and the housing is accessible. In other words, the motor can be accessed for repair and the compressor can be accessed for repair.

3 open

3. Open

The motor and the compressor DO NOT share the same shaft and therefore requires a belt or coupling to connect the motor to the compressor.

slide22

T h e

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